Explain, in detail, how you convert grams of one substance to grams of something else. Be specific and include each step.

Answers

Answer 1

First you divide the given mass of A (the initial substance) by its molar mass to get its number of moles. Then, based on a balanced chemical reaction, you divide the number of moles by the coefficient of A, then multiply by the coefficient of the product B. Finally, multiply by the molar mass of the product B (if there is a given conversion or yield %, multiply it as well), and this gives the amount of grams of the product.

Answer 2

Explanation:

First, I will assume you are asking the procedure to get mass of a substance, after we initiate a chemical reaction. If this is the case, then, let's explain it with an example:

Let's suppose we have the following reaction:

Zn + 2HCl -------> ZnCl₂ + H₂

And we part with 4.55 g of Zinc (Zn). We want to know the mass produced of ZnCl₂.

This is a simple reaction, where we only do conservation of mass. So, to get the mass of ZnCl2, we need to begin with the Zinc first, because we start with that given mass.

the mass of Zinc is 4.55 g. Chemicals reactions are better worked in moles rather than mass, because coefficients in the chemical reaction are in moles. So, in the case of the reaction (Which is already balanced):

Zn + 2HCl -------> ZnCl₂ + H₂

The number 2 that it's behind the HCl represents the theorical moles of that substance, in this case, we need 2 moles of HCl to react with only 1 mole of Zinc. It's 1 mole of Zinc because there are no numbers there, so, we always assume there's a 1 in there.

Now that we know this, let's calculate the moles of Zinc. To do that, we need the molar mass of Zinc. This can be obtained in the exercise or look the periodic table, and search for the Zinc. In this case, the molar mass of Zinc is 65.38 g/mol. So to get the moles:

n = m/MM

Replacing the data:

n = 4.55 g / 65.38 g/mol = 0.0695 moles

These are the moles of Zn reacting in the chemical reaction. Now, we should do some stechiometry. In this case, we can see that, 1 mole of zinc (In the reaction) produces 1 mole of ZnCl2, therefore the moles of Zn obtained, will be the same moles produced of ZnCl2, thus:

moles ZnCl2 = moles Zn = 0.0695 moles

Finally, with the molar mass of ZnCl2, we can calculate the mass. the molar mass of ZnCl2 is 132.29 g/mol so:

m = n * MM

Replacing:

m = 0.0695 * 132.29

m = 9.19 g of ZnCl2

And this is the simple way to obtain the mass of a substance in a reaction

Related Questions

Find number atoms in each element?

Answers

1. Gypsum has the formula as CaSO₄.2H₂O. Hence, CaSO₄ is bound with two H₂O. CaSO₄ has 1 Ca atom, 1 S atom and 4 O atoms. 2H₂O have 4 H atoms and 2 O atoms.
Hence,
total Ca atoms = 1
total S atoms = 1
total O atoms = 4 + 2 = 6
total H atoms = 4
total number of atoms = 1 + 1 + 6 + 4 = 12

2. Cellulose has the formula as C₆H₇O₂(OH)₃. But there are 2 molecules. Hence, to find total atoms in each element, number of atoms should be multiplied by 2 .The elements of the cellulose are C, H, and O. Hence,
total C atoms = 6 x 2 = 12
total O atoms = (2 + 3) x 2 = 10
total H atoms = (7 + 3) x 2 = 20
total number of atoms = 12 + 10 + 20 = 42

3. The formula of the antiperspirant is Al₂Cl(OH)₅. It has Al, Cl, O and H as the elements. Hence, the number of atoms in each element can be found as follows;
total Al atoms = 2
total Cl atoms = 1
total H atoms = 1 x 5 = 5
total O atoms = 1 x 5 = 5
total number of atoms = 2 + 1 + 5 + 5 = 13

Explanation:

Formula of gypsum is [tex]CaSO_{4}.2H_{2}O[/tex]. Therefore, total number of atoms of each element present in gypsum are as follows.

Number of Ca atom = 1

Number of S atom = 1

Number of O atom = 6

Number of H atom = 2

Formula of cellulose is [tex]C_{6}H_{7}O_{2}(OH)_{3}[/tex]. Therefore, total number of atoms of each element present in 2 molecules of cellulose are as follows.

Number of Ca atom = 2 × 6 = 12

Number of H atom = 2 × 10 = 20

Number of O atom = 2 × 5 = 10

Formula of antiperspirant is [tex]Al_{2}Cl(OH)_{5}[/tex]. Therefore, total number of atoms of each element present antipersiperant are as follows.

Number of Al atom = 2

Number of Cl atom = 1

Number of O atom = 5

Number of H atom = 5

51.7ml at 27 Celsius and 90kpa to stp

Answers

STP is the abbreviation of standard condition for temperature and pressure which is 273.15K temperature and 1.013× 10^5 Pa pressure. Since the pressure and temperature changes, I assume the question would ask about the result of the volume. The temperature used in ideal gas should be Kelvin, so 27 Celcius would be 300.15K.
The calculation would be
PV=T
V=T/P

V2/V1= T2*P1/T1*P2
V2/V1=273.15K* 90^10^3Pa/ 300.15K * 1.013× 10^5 Pa
V2= 0.81904 * 51.7ml
V2= 42.34ml

The vapor pressure of water at 25.0 oc is 23.8 torr. determine the mass of glucose (molar mass = 180. g/mol) needed to add to 27.78 moles of water to make a solution that has a vapor pressure of 23.1 torr.

Answers

According to the formula of vapor pressure:

Pv(solu) = n P°v(water)
when we have Pv(solu) = 23.1 torr & Pv(water) = 23.8 torr so we can get the mole fraction of water (n)
∴ n = Pv(solu) / Pv(water)
= 23.1 / 23.8 = 0.97 mol
when mole fraction of water = moles of water / (moles of water + moles of glucose)
So by substitution::
0.97 = 27.78 / (27.78+ X)
∴moles of gulcose = 0.85 mol
∴ mass of glucose = no.of moles * molar mass
= 0.85 * 180 = 152 g

Marine organisms that are well adapted to drastic changes in salinity would most likely be found in which environment?
a. Hydrothermal vent
b. Estuary
c. Open ocean
d. Deep ocean

Answers

The answer is Estuary

K12 the answer is estuary

Hope this helps!

what is part of the first stage in the process of technological design

Answers

Answer:

Researching information

Explanation: Edge 2020

hope this helps <3. Brainliest?

Identifying the problem is the first stage in the process of technological design.

What do you mean by technological design?

Technological design is a distinctive process with a number of defining characteristics: It is purposeful; it is based on certain requirements; it is iterative; it is creative; and it is systematic.

The four steps in the technological design process are:

Identify the problem Design a solution or product Implement the design Evaluate the product/solution.

Hence, identifying the problem is the first stage in the process of technological design.

To learn more about technological design here

https://brainly.com/question/8891864

#SPJ2

What is the mass of 1.71 ✕ 1023 molecules of h2so4?

Answers

The equation for calculating a mass is as follows:

m=n×M

Molar mass (M) we can determine from Ar that can read in a periodical table, and a number of moles we can calculate from the available date for N:

n(H2SO4)=N/NA

n(H2SO4)= 1.7×10²³ / 6 × 10²³

n(H2SO4)= 0.3 mole

Now we can calculate a mass of H2SO4:

m(H2SO4) = n×M = 0.3 × 98 = 27.8 g

What is the energy of an object in motion

Answers

It's kinetic energy :)

A gas has a pressure of 0.410 atm and volume of 32 L. At what pressure, would the volume of the gas change to 28 L

Answers

The question here follows the ideal gas law, so we can say that the ideal gas equation is applicable which is PV = nRT
where:P is pressure,V is volume,n is number of moles, R is universal gas constant, andT is temperature.
When the right-hand side of the equation is constant, P₁V₁ = P₂V₂ this is the existing relationship,
Substituting the given will give us:(0.410 atm)(32 L) = (P₂)(28 L)P₂ = 0.4686

When 7.94 g of xylene was added to 132.5 g of cyclohexane, the freezing point of the solution was -4.9oC. What is the molar mass of xylene?

Answers

Answer is: molar mass of xylene 106,18 g/mol.
m(xylene) = 7,94 g.
m(cyclohexane) = 132,5 g.
T (solution) = - 4,9 °C.
Tf(cyclohexane) = 6,5 °C, frezing point.
Kf(cyclohexane) = 20,2 K·kg/mol; cryoscopic constant.
ΔT(solution) = 6,5°C - (-4,9°C) = 11,4°C = 11,4 K.
M(xylene) = Kf · m(xylene) ÷ m(cyclohexane) · ΔT(solution).
M(xylene) = 20,2 K·kg/mol · 7,94 g ÷ 0,1325 kg · 11,4 K.
M(xylene) = 106,18 g/mol.

Calculate the mass of chromium found in the 2.50 g sample of stainless steel

Answers

The question is incomplete and missing important information which is provided below:

"Stainless steel is a corrosion resistant alloy composed of nickel, chromium and iron. A lab technician was assigned to determine the mass of chromium in a 2.50 g sample of stainless steel. The sample was first dissolved in acid to convert the chromium metal in the sample to chromium(II) ions. The acidified chromium(II) ions were then titrated with 17.69 mL of 0.125 mol/L perchlorate solution according to the unbalanced equation: ClO4- + Cr2+ --> Cl- + Cr3+. Calculate the mass of chromium found in the 2.50 g sample of stainless steel."

Now with the full question, we can first balance the equation and determine how many moles of Cr were in the sample to begin with. To balance the equation, break the equation down into its two half reactions, balance electrons and charge, then combine the reactions:

ClO₄⁻ + 4H₂O + 8e⁻ → Cl⁻ + 8OH⁻

(Cr²⁺ → Cr³⁺ + 1e⁻) x 8

ClO₄⁻ + 8Cr²⁺ + 4H₂O → Cl⁻ + 8Cr³⁺ + 8OH⁻

We know that 17.69 mL of 0.125 M ClO₄⁻ is required to titrate the Cr²⁺:

0.125 mol/L x 0.01769 L = 0.00221 mol ClO₄⁻

0.00221 mol ClO₄⁻ x 8 mol Cr²⁺/mol ClO₄⁻ = 0.01769 mol Cr²⁺

With moles of chromium, we can now use the molecular weight of chromium to determine the mass of chromium present:

0.01769 mol x 52 g/mol = 0.92 g chromium

In a 2.50 g sample of stainless steel, there is 0.92 g of chromium.

Final answer:

To find the mass of 0.560 moles of chromium, multiply the number of moles by the molar mass of chromium (51.996 g/mol), resulting in 29.11816 grams.

Explanation:

To calculate the mass of chromium found in a 2.50 g sample of stainless steel, we need to know the percentage composition of chromium in the alloy. However, the question provides data for 0.560 moles of chromium and not the composition of the stainless steel sample. To find the mass of 0.560 moles of chromium, we use the molar mass of chromium.

Steps to Calculate Mass of Chromium

Determine the molar mass of chromium from the periodic table, which is approximately 51.996 g/mol.Multiply the number of moles of chromium (0.560 moles) by its molar mass.The resultant product gives the mass of 0.560 moles of chromium.

Performing this calculation: 0.560 moles × 51.996 g/mol = 29.11816 grams of chromium.

The number of protons is different for each element and is know as the

Answers

The number of protons in an element is the Atomic Number

Molecules of hydrogen escape from earth, but molecules of oxygen and nitrogen are held to the surface and remain in the atmosphere. explain.

Answers

Hydrogen escape from Earth because he is ligher than molecules of nitrogen and oxygen. Hydrogen move faster and can escape Earth's gravitational force.
One mole of molecule of hydrogen (H₂) has molecular mass 2 g/mol, molecule of nitrogen (N₂) has molecular mass 28 g/mol and oxygen (O₂) has 32 g/mol.

Answer:

Hydrogen is a light molecule

Explanation:

The molecular weight of a gas determines its molecular speed. Hydrogen is a very light gas, far lighter than oxygen or nitrogen. These heavier gases cannot escape the earth because of their molecular weight but hydrogen does escape the earth surface because it is very light molecule having very high molecular speed.

The decomposition of dinitrogen tetraoxide into nitrogen gas and oxygen gas is shown by which balanced chemical equation?

Answers

Know what decomposition is. The compound is "breaking down".

Di means 2 while, Tetra means 4.

First, we will simply follow the instructions and break down the compound as so: The decomposition of dinitrogen tetraoxide into nitrogen gas and oxygen gas

*Take into account that diatomic molecules (HNOFClBRI) will always have a subscript of 2

N₂O₄⇒N₂+O₂

After breaking down the compound, we must now balance the equation.

To balance the equation, we must make sure that each element has the same amount of atoms.

Starting with compound at the left of the yield: N=2 and O=4
But, at the right of the yield: N=2 and O=2
We have now discovered that the oxygen gas is not balanced throughout the equation.

N₂O₄⇒N₂+2O₂

*We simply multiply the oxygen gas on the right of the equation by 2

After multiplying, on the right side of the equation, O=4. We now have a balanced equation because all elements have the same amount of atoms on each side.

So your final answer for this balanced decomposition chemical equation is: N₂O₄⇒N₂+O₂

Answer: N2o4 - N2 + 202

Explanation:

What type of reaction is
Na2S (I) + CdNO3 (I) => CdS (s) + 2NaNO3 (I)

A. Double-Displacement
B. Single-Displacement
C. Decomposition
D. Synthesis

Answers

Whenever you see an inorganic chemical reaction that involves the switching or replacing of atoms in ionic compounds, it is termed as a Double displacement reaction.

The Solution is A.

Answer:

The correct answer is A. Double-Displacement

Explanation:

A double displacement reaction is that two elements found in different compounds exchange positions, forming two new compounds. These chemical reactions do not present changes in the number of oxidation or relative load of the element. Generally the exchange occurs between reagents that are ionic compounds in solution, where the anions and cations of the compounds are exchanged.

Double displacement reactions follow the following general chemical equation:

AB + CD --- AD + CB

The initial compounds AB and CD react by exchanging "their partners" and thus form two new compounds: AD and CB. This reaction takes place if and only if A and D are more similar than A and C, or if CB links are more stable than those of CD. Since the reaction is a simple ion exchange, none of these gain or lose electrons, as mentioned above. Thus, if A is a +1 charge cation in compound AB, it will have the same +1 charge in compound AD.

The solvent of the double displacement reactions is almost always water and the reagents and products are usually ionic compounds, although they can also be acids or bases.

On the other hand, a precipitation reaction occurs when two aqueous ionic compounds form a new ionic compound that is not soluble in water. It is an example of double displacement reactions. In most precipitation reactions, one salt is soluble and the other precipitates. The insoluble compound that results is called precipitate. The solvent and soluble reaction compounds are called the supernatant. This is the type of reaction that happens in this case. In this case the insoluble compound is cadmium sulfide CdS.

Three different sub-atomic particles are described below:
Particle X: Uncharged
Particle Y: Present outside the nucleus
Particle Z: Attracts Particle Y
Which statement is true?
X is a neutron, Y is an electron, and Z is a proton.
X is a neutron, Y is a proton, and Z is an electron.
X is a proton, Y is an electron, and Z is a neutron.
X is an electron, Y is a proton, and Z is a neutron.

Answers

Particle x is uncharged. That makes the last 2 wrong. Both electrons and protons have charges.

If y is outside the nucleus, it is an electron. and z must be the proton.

Choose the first answer. <<<<<<=====

Answer:

The first answer

Explanation:

Why? Because i got it right on my test.

I didn't copy of the other persons answer.

HELP. Check all answers that apply.
Copper oxide is a(n):
atom.
molecule.
subatomic particle.
element.
compound.

Answers

I think the answer is compound

The answer is compound subatomic particles i think.

What is the ph of a 0.01 m solution of the strong acid hno3 in water?

Answers

The pH of a 0.01 M solution of the strong acid [tex]HNO$_3$[/tex] in water is 2.

To determine the pH of a strong acid solution, we can use the fact that strong acids completely dissociate in water. This means that for a 0.01 M solution of [tex]HNO$_3$[/tex], all of the [tex]HNO$_3$[/tex] molecules dissociate into H⁺ ions and [tex]NO$_3$$^-$[/tex] ions. Therefore, the concentration of H⁺ ions in the solution is equal to the concentration of the [tex]HNO$_3$[/tex] solution, which is 0.01 M.

The pH of a solution is defined as the negative logarithm (base 10) of the hydrogen ion concentration [H⁺]:

[tex]\[ \text{pH} = -\log_{10} [\text{H}^+] \][/tex]

Substituting the concentration of H⁺ ions into the equation gives:

[tex]\[ \text{pH} = -\log_{10} (0.01) \] \[ \text{pH} = -\log_{10} (10^{-2}) \] \[ \text{pH} = -(-2) \] \[ \text{pH} = 2 \][/tex]

Thus, the pH of a 0.01 M [tex]HNO$_3$[/tex] solution is 2.

The volume of a gas is 4.00 liters at 293 k and constant pressure. for the volume of the gas to become 3.00 liters, the kelvin temperature must be equal to

Answers

Answer:

3.00 * 293 / 4.00

Explanation:

Using Charles's law, which states the direct proportionality between volume and temperature of a gas at constant pressure, the final temperature needed for the gas to reach a volume of 3.00 liters is approximately 219.75 K.

The question is asking about the relationship between the volume and temperature of a gas at constant pressure. This relationship is described by Charles's law, which states that the volume of a gas is directly proportional to its temperature when pressure is held constant. In mathematical terms, V1/T1 = V2/T2, where V1 and T1 are the initial volume and temperature, and V2 and T2 are the final volume and temperature.

Given the initial volume of 4.00 liters and temperature of 293 K, if the volume decreases to 3.00 liters, we can solve for the new temperature using Charles's law:

(4.00 L / 293 K) = (3.00 L / T2)

By cross-multiplying and solving for T2, we get:

T2 = (3.00 L * 293 K) / 4.00 L = 219.75 K

So, for the volume of the gas to become 3.00 liters at constant pressure, the kelvin temperature must be approximately 219.75 K.

Sulfuric acid reacts with aluminum hydroxide by double replacement. if 34 g of sulfuric acid react with 33 g of aluminum hydroxide, identify the limiting reactant.

Answers

Answer is: sulfuric acid is the limiting reactant.
Chemical reaction: 3H₂SO₄ + 2Al(OH)₃ → Al₂(SO₄)₃ + 6H₂O.
m(H₂SO₄) = 34 g.
n(H₂SO₄) = m(H₂SO₄) ÷ M(H₂SO₄).
n(H₂SO₄) = 34 g ÷ 98 g/mol.
n(H₂SO₄) = 0,346 mol.
m(Al(OH)₃) = 33 g.
n(Al(OH)₃) = 33 g ÷ 78 g/mol.
n(Al(OH)₃) = 0,423 mol.
From chemical reaction: n(H₂SO₄) : n(Al(OH)₃) = 3 : 2.

Final answer:

To determine the limiting reactant between sulfuric acid and aluminum hydroxide, calculate the moles of each reactant using their molar masses. Comparisons based on the stoichiometric ratios from the balanced chemical equation reveal that sulfuric acid is the limiting reactant.

Explanation:

To identify the limiting reactant when 34 g of sulfuric acid reacts with 33 g of aluminum hydroxide, we need to calculate the moles of each reactant based on their molar masses. The balanced chemical equation for the reaction between sulfuric acid (H₂SO₄) and aluminum hydroxide (Al(OH)₃) is:

3 H₂SO₄(aq) + 2 Al(OH)₃(s) → Al₂(SO₄)₃(aq) + 6 H₂O(l)

First, determine the molar mass of H₂SO₄, which is approximately 98 g/mol, and Al(OH)₃, which is approximately 78 g/mol. Then, calculate the moles of each reactant:

Moles of H₂SO₄ = 34 g / 98 g/mol = 0.347 molesMoles of Al(OH)₃ = 33 g / 78 g/mol = 0.423 moles

The balanced equation shows that 3 moles of H₂SO₄ react with 2 moles of Al(OH)₃. We then set up ratios to see which reactant is limiting:

0.347 moles H₂SO₄ × (2 moles Al(OH)₃ / 3 moles H₂SO₄) = 0.231 moles Al(OH)₃ required0.423 moles Al(OH)₃ × (3 moles H₂SO₄ / 2 moles Al(OH)₃) = 0.635 moles H₂SO₄ required

Since we only have 0.347 moles of H₂SO₄ but require 0.635 moles to react with all the available Al(OH)₃, sulfuric acid is the limiting reactant.

A sample of ammonia contains 0.500 mol. What volume at STP would the gas occupy?

Answers

To convert from moles to volume, you simply multiply the moles by 22.4 L.

(.500 mol)(22.4L)= 11.2 L

A sample of ammonia would occupy 11.2 L at STP.

I attached a mole map. Hope that'll help you in the future.

An explanation based on experimentation and data is a scientific

Answers

Hello,

Here is your answer:

The proper answer to the question is a "scientific theory"! That's because a scientific theory is a explanation based on expierment and data!

Your answer is scientific theory!

If you need anymore help feel free to ask me!

Hope this helps!

When methanol, ch3oh, is burned in the presence of oxygen gas, o2, a large amount of heat energy is released. for this reason, it is often used as a fuel in high performance racing cars. the combustion of methanol has the balanced, thermochemical equation ch3oh(g)+32o2(g)â¶co2(g)+2h2o(l)Î´h=â764 kj how much methanol, in grams, must be burned to produce 541 kj of heat?

Answers

Answer is: 22,65 gramsof methanol must be burned.
Chemical reaction: CH₃OH + 3/2O₂ → CO₂ + 2H₂O. ΔH = -764 kJ.
Make proportion, if one mole of ethanol release 764 kJ of heat, than:
1 mol : 764 kJ = n(CH₃OH) : 541 kJ.
n(CH₃OH) = 0,708 mol.
m(CH₃OH) = n(CH₃OH) · M(CH₃OH).
m(CH₃OH) = 0,708 mol · 32 g/mol.
m(CH₃OH) = 22,65 g.

[tex]\boxed{{\text{22}}{\text{.69 g}}}[/tex] of methanol must be burned to produce 541 kJ of heat.

Further explanation:

Combustion reaction:

It is the reaction in which the reactant reacts with molecular oxygen to form carbon dioxide and a water molecule. Molecular oxygen acts as the oxidizing agent in these reactions. A large amount of heat is released and therefore combustion reactions are exothermic in nature.

The change in enthalpy that occurs due to the formation of one mole of the compound from its constituent elements is called the standard enthalpy of formation. It is represented by [tex]\Delta {H_{{\text{rxn}}}}[/tex] and its units are kJ/mol.

The combustion of methanol occurs as follows:

[tex]{\text{C}}{{\text{H}}_3}{\text{OH}}+\frac{3}{2}{{\text{O}}_2}\to{\text{C}}{{\text{O}}_2}+2{{\text{H}}_{\text{2}}}{\text{O}}[/tex]

The value of [tex]\Delta {{\text{H}}_{{\text{reaction}}}}[/tex] is -764 kJ/mol. This indicates the heat produced when one mole of methanol is combusted. The negative sign means the heat is released during the process.

The number of moles of methanol [tex]\left( {{\text{C}}{{\text{H}}_3}{\text{OH}}} \right)[/tex] required in the given reaction is calculated as follows:

[tex]\begin{aligned}{\text{Moles of C}}{{\text{H}}_3}{\text{OH}}&=\left({541{\text{ kJ}}} \right)\left( {\frac{{{\text{1 mol}}}}{{764{\text{ kJ}}}}}\right)\\&=0.708{\text{ mol}}\\\end{aligned}[/tex]

The formula to calculate the mass of methanol [tex]\left( {{\text{C}}{{\text{H}}_3}{\text{OH}}} \right)[/tex] is as follows:

[tex]{\text{Mass of C}}{{\text{H}}_3}{\text{OH}}=\left({{\text{Moles of C}}{{\text{H}}_3}{\text{OH}}}\right)\left({{\text{Molar mass of C}}{{\text{H}}_3}{\text{OH}}}\right)[/tex] ...... (1)

The number of moles of [tex]{\text{ C}}{{\text{H}}_3}{\text{OH}}[/tex] is 0.708 mol.

The molar mass of [tex]{\text{ C}}{{\text{H}}_3}{\text{OH}}[/tex] is 32.04 g/mol.

Substitute these values in equation (1).

[tex]\begin{aligned}{\text{Mass of C}}{{\text{H}}_3}{\text{OH}}&=\left({{\text{0}}{\text{.708 mol}}} \right)\left({\frac{{{\text{32}}{\text{.04 g}}}}{{{\text{1 mol}}}}}\right)\\&=22.688{\text{ g}}\\&\approx {\text{22}}{\text{.69 g}}\\\end{aligned}[/tex]

Therefore the mass of methanol burned is 22.69 g.

Learn more:

1. Calculate [tex]\Delta {\text{H}}[/tex] for the reaction using Hess law: https://brainly.com/question/11293201

2. Calculate the hydroxide ion concentration: https://brainly.com/question/11293214

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Thermodynamics

Keywords: methanol, CH3OH, combustion, 746 kJ, 541 kJ, mass of CH3OH, molar mass of CH3OH, 22.69 g, moles of CH3OH.

In a reaction, a gas being produced is

Answers

A solid product called a may form when chemicals in two liquids react, as shown in the photograph below. ... The photo- graph below shows an example in which carbon dioxide gas is produced by a chemical reaction. Temperature Change Most chemicalreactions involve a temperature. change.

which of the following groups contain 3 elements with stable electron configuration
a. xenon, neon, boron
b. calcium, krypton, argon c. helium, xenon, carbon d. argon, neon, xenon

Answers

Xenon and neon are elements with stable configuration because they are noble gases and have enough to fill their outermost (valence) electron shell. Boron, however, only has 3 electrons in its valence shell, meaning that it is not stable and it needs to gain more electrons to be so. Calcium is an alkali earth metal and has only two electrons in its outermost shell, it will likely lose those two electrons to become stable because it takes less energy than gaining 6. Krypton and argon are other noble gases and have enough electrons to fill their shells. Helium has enough to fill it's outermost shell with 2 due to special properties of that element, it is still a noble gas. Essentially, your answer is D. If you take a look at the periodic table, you'll find your answers out in less time than it took me to type this out. All stable gases, with the exception of hydrogen, are in the last group, usually labeled as "18" but called 8 or 0.

Option d, which includes argon, neon, and xenon, contains three elements with stable electron configurations as they are all noble gases with full valence shells.

The student's question pertains to the electron configuration of elements, specifically identifying a group of elements that all have stable electron configurations. A stable electron configuration typically means having a full valence shell of electrons, which is characteristic of the noble gases. Noble gases include helium, neon, argon, krypton, xenon, and radon, and they are known for being chemically inert, or nonreactive, due to their complete electron shells. The correct answer to the question is option d. argon, neon, xenon, as all three of these elements are noble gases and therefore have a stable electron configuration.

Which of these choices is an indirect cost of using coal?

A. Cost to transport coal
B. Cost of maintaining power plants
C. Cost to mine coal
D. Cost of pollution from burning coal

Answers

Answer:

D. Cost of pollution from burning coal

Explanation:

Energy resources can be classified into two categories: renewable and non-renewable.

Renewable resources are those that can be replenished within a short time. This includes, wind energy, solar, hydrothermal etc

Non-renewable resources in contrast, are finite and are in limited supply. This includes, fossil fuels like coal, oil and natural gas as well as nuclear energy.

Coal is a fossil fuel which also the most common source of energy. However, it pollutes the environment by emitting carbon dioxide which is greenhouse gas.

In an ecosystem ,cost of pollution from burning coal is an indirect cost of using coal.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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What is the pH of blood, given the hydrogen ion concentration is 4.0 × 10-8M?

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Clinically, a blood pH of 7.4 is considered a normal value. If the pH of the blood is lower than 7.4, it is shown that the blood is acidic, that you have acidosis or a lack of bases. If the pH of the blood is above 7.4, it is said that the blood is alkaline, that you have an alkalosis or excess of base.

For calculating pH of blood, we will use next equation:

pH = -log c(H⁺)

pH = -log(4.0x10⁻⁸)

pH = 7.4

The pH of blood with a hydrogen ion concentration of 4.0 × 10⁻⁸ M, we use the formula pH = -log[H+]. This results in a pH of approximately 7.4, indicating that blood is slightly alkaline.

The pH of blood given the hydrogen ion concentration, use the formula: pH = -log[H+]

Given: [H+] = 4.0 × 10⁻⁸ M

Step-by-step calculation:

First, find the log of 4.0 × 10⁻⁸log(4.0 × 10-8) = log(4.0) + log(10⁻⁸)log(4.0) ≈ 0.6021log(10-8) = -8Therefore, log(4.0 × 10⁻⁸) ≈ 0.6021 - 8 = -7.3979

So, the pH = -(-7.3979) = 7.3979

Conclusion: The pH of blood is approximately 7.4, which is slightly alkaline.

If the strength of the magnetic field at B is 6 units, the strength of the magnetic field at A is _____.

file:///C:/AOP/SH2016Curric/AOP.COM.Science.09IPC.2015/IntegratedPhysicsandChemistry2015/9/magnetic_field_ex1.gif

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Think its close to 24 if thats a multiple choice answer, I cannot view the image sorry.

Final answer:

The magnetic field strength at point A cannot be determined based solely on the strength at point B being 6 units. Factors such as distance from the magnet, the presence of ferromagnetic materials, and orientation relative to the magnetic lines of force could affect its strength.

Explanation:

Unfortunately, there is missing information in your question. The strength of the magnetic field at point A cannot be determined, just with the strength at point B being 6 units. The magnetic field strength can vary depending on factors like the distance from the magnet, if any ferromagnetic materials are near, and the orientation relative to the magnetic lines of force. Without additional context or information, it's impossible to infer the magnetic field strength at point A accurately.

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Which of the following applies to a good hypothesis?
Select all that apply

- It explains the data that relates to the specific problem.
- It leads to correct predictions, some of which produce new evidence or experiments.
- It is biased by the experimenter's presuppositions.
- It is formulated based on subjective observations.
- It is formulated based on objective observations

Answers

1). it leads to correct predictions, some of which produce new evidence or experiments.
2). It is formulated based on objective observations.
3). It explains the data that relates to the specific problem.

Hope this helps!
♤MidnightQueen

The statements that applies to a good hypothesis are.

It explains the data that relates to the specific problem.It leads to correct predictions, some of which produce new evidence or experiments. It is formulated based on objective observations

Good hypothesis explained.

A good hypothesis ought to give an clarification for the information related to the issue being examined. It ought to too lead to forecasts that can be tried and possibly create modern prove or tests.

A good hypothesis ought to be defined based on objective perceptions, meaning it ought to be grounded in irrefutable and quantifiable information instead of subjective conclusions or inclinations.

It is worth noticing that a hypothesis can be impacted by earlier

information or foundation presumptions, but it ought to still be based on objective perceptions and open to experimental testing and confirmation.

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Will maynez burns a 0.8-g peanut beneath 76 g of water, which increases in temperature from 22âc to 46 âc. (the specific heat capacity of water is 1.0 cal/(gââc).)

Answers

Based on the information provided, it appears that you will need to calculate the amount of heat absorbed by the water from the peanut that was burned. We are given the following information:

specific heat capacity, c = 1.0 cal/g°C
mass of water = 76 g
Ti = 22°C
Tf = 46°C
change in temperature, ΔT = 24°C

We can use the formula q = mcΔT to measure the amount of energy absorbed by the water to increase in tempature:

q = (76 g)(1.0 cal/g°C)(24°C)

q = 1824 cal

Therefore, the water absorbed 1824 calories from the peanut that was burned.

How many nad+ are reduced in the β-oxidation of stearoyl-coa to form nine molecules of acetyl-coa?

Answers

The answer should be 8

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