If it takes 43.32 ml of 0.1 M NaOH to neutrlize a 50 ml HCI solution, how many moles of HCI were originally present?

Answer:

There are three main measures of central tendency: the mode(the number that occurs most often) the median ( the middle value in the list of numbers) and the mean (the average number in the list of numbers)

Explanation:

I learned this

Answer:

The correct answer is option a.

Explanation:

When aluminum hydroxide reacts with of nitrous acid it gives of aluminum nitrite and of water.

[tex]Al(OH)_3+3HNO_2\rightarrow Al(NO_2)_3+3H_2O[/tex]

According to above reaction ,when 1 mole of aluminum hydroxide reacts with 3 moles of nitrous acid it gives 1 mole of aluminum nitrite and 3 moles of water.

Hence, the correct answer is option a.

Answer:

The amount (mass) of water we will have is 17.869 grams

Explanation:

The molar mass of hydrogen gas H₂ = 2.016 grams/mole

The molar mass of oxygen gas = 31.999 g/mol

Therefore, 2.00 g of hydrogen will give;

2.00/2.016 = 0.9921 moles of H₂ gas and

15.87 g of O₂ will give;

15.87/31.999 = 0.49595 moles

The reaction is as follows;

2H₂ (g) + O₂ (g) → 2H₂O (l)

Two moles of H₂ react with one mole of O₂ to produce two moles of H₂O

Therefore 0.9921 moles of H₂ will react with 0.9921/2 or 0.49595 moles of O₂ to produce 0.9921 moles of H₂O

From the above we note that all the H₂ and O₂ are completely consumed to form 0.9921 moles of H₂O

Molar mass of H₂O = 18.01528 g/mol

Number of moles = Mass/(Molar mass)

∴ Mass of H₂O = (Molar mass) × (Number of moles)

= 18.01528 g/mol × 0.9921 moles = 17.869 grams

Therefore the amount (mass) of water we will have = 17.869 grams.

Answer:

Too much phosphorus in the water causes algae to grow faster than ecosystems can handle. Large growths of algae are called algal blooms and they can severely reduce or eliminate oxygen in the water, leading to illnesses in fish and the death of large numbers of fish.

Explanation

Futhermore, with a loss of fish the whole ecosystem will be upset and will be in need of serious recovery.

Final answer:

Phosphate acts as an environmental contaminant by promoting eutrophication, excessive growth of algae in water. It is introduced through human activities and contributes to the overgrowth of algae, leading to negative effects on the aquatic ecosystem.

Explanation:

Phosphate acts as an environmental contaminant due to its role in promoting eutrophication. Eutrophication is the excessive growth of algae in a body of water, which leads to a decrease in dissolved oxygen levels that can harm aquatic organisms. Phosphates are introduced into the environment through human activities, such as the use of phosphate-containing detergents and the leaching of phosphate from rock by weathering. These phosphates contribute to the overgrowth of algae and the subsequent negative effects on the aquatic ecosystem.a

Answer:

heated crude oil enters a tall fractionating column , which is hot at the bottom and gets cooler towards the top.

vapours from the oil rise through the column.

vapours condense when they become cool enough.

liquids are led out of the column at different heights.

sorry for bad spelling i think this is right

hope this helps :)

Heated crude oil needs to enter a tall fractionating column that is hot at the bottom and cools as it ascends. The oil vapors rise through the column. When vapors cool sufficiently, they condense.

A mixture of liquids is boiled in a fractional distillation, and the resulting vapors travel up a glass tube known as a "fractionating column" and separate.

The fractionating column, which is positioned between the flask containing the mixture and the "Y" adaptor, improves the separation of the liquids being distilled.

In general, the distillation process consists of three major steps: The process of converting a desired liquid from a mixture into vapor. The purified liquid's condensation. The condensed liquid collection.

Heated crude oil enters a tall fractionating column, which is hot at the bottom and cools as it ascends.

The oil vapors rise through the column. When vapors cool sufficiently, they condense. At various heights, liquids are led out of the column.

Thus, these are the steps involved in fractional distillation that used to refine crude oil.

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Answer: The number of moles of calcium carbonate is 0.637 moles

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

We are given:

Given mass of calcium carbonate = 63.8 g

Molar mass of calcium carbonate = 100.09 g/mol

Putting values in above equation, we get:

[tex]\text{Number of moles of calcium carbonate}=\frac{63.8g}{100.09g/mol}\\\\\text{Number of moles of calcium carbonate}=0.637mol[/tex]

Hence, the number of moles of calcium carbonate is 0.637 moles

Answer:

ATCCGAT

Explanation:

A always matches with T

G always matches with C

Answer: 26.8 kJ of energy is needed to vaporize 75.0 g of diethyl ether

Explanation:

First we have to calculate the moles of diethyl ether

[tex]\text{Moles of diethyl ether}=\frac{\text{Mass of diethyl ether}}{\text{Molar mass of diethyl ether}}=\frac{75.0g}{74g/mole}=1.01moles[/tex]

As, 1 mole of diethyl ether require heat = 26.5 kJ

So, 1.01  moles of diethyl ether require heat = [tex]\frac{26.5}{1}\times 1.01=26.8kJ[/tex]

Thus 26.8 kJ of energy is needed to vaporize 75.0 g of diethyl ether

The energy i.e. needed is 26.8 kJ of energy

the moles of diethyl ether is

[tex]= 75.0 g \div 74\\\\[/tex]

= 1.01 moles

Since one  mole of diethyl ether require heat = 26.8 kJ

Now the energy should be the same i.e. 26.8

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Answer:

Radon

Explanation:

The element represented by [Rn]7s1 is francium (Fr), an alkali metal in Group 1 of the periodic table. Francium is highly reactive and extremely rare, with a short half-life.

The element represented by [Rn]7s1 is francium (Fr).

Fr is an alkali metal in Group 1 of the periodic table and has the atomic number 87. It is highly reactive and can be found in very small amounts in minerals.

Fr is the second rarest naturally occurring element and is extremely unstable, with a very short half-life.

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Answer:

d. stimulus generalization

Explanation:

Stimulus generalization consists of the appearance of the unconditional response to conditioned stimuli that had never been paired with it but that have a similarity to it.

Answer:

52 atm

Explanation:

25 + 12 + 15 = 52 atm

- Please let me know you agree with this or if it is right or wrong. If wrong, I will fix it.

Answer:

I don't understand

Explanation:

Sorry

Answer:

Butanol

Explanation:

By counting, we know this is C4H9OH

C4H9OH is Butanol

Answer:

78 mmHg is the partial pressure of the nitrogen.

Explanation:

According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.

[tex]P=p_{1}+p_{2}+p_{3}[/tex]

where,

[tex]P[/tex] = total pressure of the gas mixture = 456 mmHg

[tex]p_{1}[/tex] = partial pressure of hydrogen gas = 230 mmHg

[tex]p_{2}[/tex] = partial pressure of oxygen gas = 148 mmHg

[tex]p_{3}[/tex] = partial pressure of nitrogen gas = ?

Now put all the given values is expression, we get the partial pressure of the nitrogen gas i.e.  [tex]p_3[/tex] .

[tex]456 mmHg=230 mmHg+148 mmHg+p_3[/tex]

[tex]p_3=456 mmHg-230 mmHg-148 mmHg=78 mmHg[/tex]

78 mmHg is the partial pressure of the nitrogen.

The solution with a pH of 2 has 100 times more protons in it than the solution with a pH of 4.

The pH scale is a logarithmic scale that quantifies a solution's acidity or alkalinity based on the concentration of hydrogen ions (protons) in it. Each unit on the pH scale reflects a tenfold change in hydrogen ion concentration. When compared to a solution with a pH of 4, a solution with a pH of 2 has a larger concentration of hydrogen ions. In particular, for every pH unit reduction, the concentration of hydrogen ions increases by a factor of ten. As a result, a pH 2 solution contains 102 (100) times more hydrogen ions than a pH 4 solution.

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A solution with a pH of 2 has a hundred times more protons than a solution with a pH of 4. PH measures the concentration of hydrogen ions (protons) in a solution in a logarithmic scale, where each unit decrease indicates a tenfold increase.

The pH scale is a logarithmic measure of the concentration of hydrogen ions (protons) in a solution. A solution with a pH of 2 has a hundred times (102) more protons than a solution with a pH of 4, because each unit decrease on the pH scale represents a tenfold increase in proton concentration. Therefore, a decrease from pH 4 to pH 2 constitutes a hundredfold increase in proton concentration.

Answer:

he can bang metal pipes but i would rather say that he has to yell for help

Explanation:

why because the basement is very loud and echo so when is parents hear him they can run to basement and get him out

hope this helped

The specific characteristic of the metal is to emit a resonant sound when banged. Metals are sonorous, so, banging on the metal pipes can help Jonathan to let his parents know his condition, i.e., option B.

Metals are materials that are lustrous, ductile, good conductors of heat and electricity, and malleable.

Other properties include the state of metals which are solids at room temperature except mercury and gallium, which is liquid at room temperature.

The property of sonority of metals can help Jonathan to let his parents know his condition.

Thus, the correct answer is B.

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Answer:

308.15

Explanation:

To convert 35 degrees Celsius to Kelvin, you add 273.15, resulting in 308.15 Kelvin.

This conversion is straightforward because the size of one Kelvin is the same as one degree Celsius.

For instance, to find the Kelvin equivalent of 35 degrees Celsius, you would calculate as follows:

Answer:

Temperature increase with the increasing Kinetic energy of the molecule.

Explanation:

When Kinetic energy of the molecule increases, the number of collisions increases between the molecule. Hence, By speeding up the molecule temperature increases.

Answer:

Percent yield = 50%

Explanation:

Given data:

Mass of CH₄ = 16 g

Mass of O₂ = 32 g

Mass of CO₂ = 11 g

Percent yield of CO₂ = ?

Solution:

Chemical equation:

CH₄ + 2O₂    →  CO₂ + 2H₂O

Number of moles of CH₄:

Number of moles = mass/ molar mass

Number of moles = 16 g /16 g/mol

Number of moles = 1 mol

Number of moles of O₂:

Number of moles = mass/ molar mass

Number of moles = 32 g /32 g/mol

Number of moles = 1 mol

Now we will compare the moles of CO₂ with both reactant.

                             O₂             :            CO₂

                              2              :               1

                              1               :          1/2×1= 0.5 mol

                          CH₄              :            CO₂

                             1               :               1

Number of moles of CO₂ produced by oxygen are less so it will limiting reactant.

Theoretical yield:

Mass of CO₂:

Mass = number of moles × molar mass

Mass = 0.5 mol × 44 g/mol

Mass = 22 g

Percent yield:

Percent yield = actual yield / theoretical yield × 100

Percent yield = 11 g/ 22 g × 100

Percent yield = 50%

Answer:

5.24×10^3 L

Explanation:

Considering the volume occupied by 454.5g of H2 at 1.050 atm and 25°C.

Likewise, using ideal gas equation.

pV = nRT

Answer: The volume occupied by the gas is 5295.1 L

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

Given mass of hydrogen gas = 454.5 g

Molar mass of hydrogen gas = 2 g/mol

Putting values in above equation, we get:

[tex]\text{Moles of hydrogen gas}=\frac{454.5g}{2g/mol}=227.25mol[/tex]

To calculate the volume, we use the equation given by ideal gas equation:

PV=nRT

where,

P = pressure of the gas = 1.050 at m

V = Volume of gas = ?

n = number of moles of gas = 227.25 moles

R = Gas constant = [tex]0.0821\text{ L atm }mol^{-1}K^{-1}[/tex]

T = temperature of the gas = [tex]25^oC=[25+273]K=298K[/tex ]

Putting values in above equation, we get:

[tex]1.050atm\times V=227.25mol\times 0.0821\text{ L atm }mol^{-1}K^{-1}\times 298K\\\\V=\frac{227.25\times 0.0821\times 298}{1.050}=5295.1L[/tex]

Hence, the volume occupied by the gas is 5295.1 L

Answer:

c

Explanation:

Answer:

The answer to your question is 0.57 moles

Explanation:

Data

volume = 1.9 L

[NaCl] = 0.3

moles of NaCl = ?

Process

1.- To solve this problem use the formula of Molarity.

Molarity = moles/ volume (l)

-Solve for moles

moles = Molarity x volume

-Substitution

 moles = 0.3 x 1.9

-Result

 moles = 0.57

-Conclusion

There are 0.57 moles of NaCl in 1.90 L of a 0.3 M solution.

Answer:

5C + 6O₂ → 5CO + 7/2 O₂

Explanation:

According to the question the reaction is between carbon and oxygen molecule . The reactant side was given as 5 moles of carbon reacting with 6 moles of oxygen molecules.   The chemical reaction between carbon and excess oxygen will form carbon dioxide but with limited oxygen it will form carbon monoxide.  

Now let us write and balance the actual chemical equation as required from the question. In limited oxygen the reaction will be

The reactant said 5 moles of carbon which is 5 atoms of carbon reacting with 12 atoms of oxygen.  The number of atoms of element on both sides of the chemical equation need to be balance . The balanced equation when oxygen is limited is written as

5C + 6O₂ → 5CO + 7/2 O₂

The product will be 5 moles of carbon monoxide and 3.5 moles of oxygen molecules(7 atoms) since the oxygen is limited . The carbon monoxide later reacts with more oxygen to form carbon dioxide.

Limiting reactant is the reactant that stops the reaction when it is completely consumed.  The product of the given reaction is Carbon dioxide.

Balanced Reaction:

A reaction in which the number of moles of atoms in reactants is equal to the number of moles of the atoms in the product.

The given reaction,

[tex]\bold{5C + 6O_2 \rightarrow 5CO_2 \\\\}[/tex]

Therefore, the product of the given reaction is Carbon dioxide.

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Answer:

M or mol/[tex]dm^{3}[/tex]

Explanation:

Answer:

Mol/kg

Explanation:

Ape-x

Answer: The molarity of solution is 2 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n = moles of solute = 1.4

[tex]V_s[/tex] = Volume of solution in ml = 700 ml

Now put all the given values in the formula of molality, we get

[tex]Molality=\frac{1.4\times 1000}{700}=2mole/L[/tex]

Therefore, the molarity of solution is 2 M

Answer:

Explanation:

A Brönsted-Lowry acid is defined as any substance that has the ability to lose, or "donate a proton" [H +].

A Brönsted-Lowry base is a substance capable of gaining or "accepting a proton" [H +].

Then a proton transfer occurs, which requires the presence of a proton donor, that is, an acid and a base that accepts them.

This theory has the disadvantage of leaving out several substances that are acidic and that do not have protons.

Thiocyanic acid is a chemical compound that can be considered, but not a Bronsted Lowry base, giving up the proton and generating the anion [SCN] -

Answer:

It can be a bronsted Lowry acid but not a bronsted Lowry base

Explanation:

Bronsted Lowry acid are proton donors, and HSCN can donate a proton, but it cannot accept a proton, hence not a bronsted Lowry base

Answer:

P(Ar) = 27 Kpa

Explanation:

Given data:

Total pressure of tire = 150.0 Kpa

Partial pressure of O₂ = 43.5 Kpa

Partial pressure of Ar  = ?

Partial pressure of N₂ = 79.5 kPA

Solution:

According to Dalton law of partial pressure,

The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.

Mathematical expression:

P(total) = P₁ + P₂ + P₃+ ............+Pₙ

Now we will solve this  problem by using this law.

P(total) = PO₂ +  PN₂ + P(Ar)

150.0 Kpa = 43.5 Kpa + 79.5 Kpa + P(Ar)

150.0 Kpa = 123 Kpa + P(Ar)

P(Ar) = 150.0 Kpa - 123 Kpa

P(Ar) = 27 Kpa

Answer : The volume of oxygen occupy at 173° would be, 703.2 mL

Explanation :

Charles' Law : It states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

where,

[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.

[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.

We are given:

[tex]V_1=473mL\\T_1=27^oC=(27+273)K=300K\\V_2=?\\T_2=173^oC=(173+273)K=446K[/tex]

Now put all the given values in above equation, we get:

[tex]\frac{473mL}{300K}=\frac{V_2}{446K}\\\\V_2=703.2mL[/tex]

Therefore, the volume of oxygen occupy at 173° would be, 703.2 mL

Answer:

THE CORRECT ANSWER TO THE QUESTION ABOVE IS " UREA"

Explanation:

SOLUTE is defined as solid, liquid, or gas that is dissolved in a solution.

URINE is a by-product of metabolism that is produced by the kidneys in their process of blood purification. URINE contains of water, urea, chloride, sodium, potassium, dissolved ions, and inorganic and organic compounds.

Physical characteristics of URINE include color, smell, pH, density and turbidity.

UREA (also known as carbamide) is a non-toxic molecule, it is made up of ammonia and carbon and is the major organic component of human urine. UREA in urine is 9.3 g/L.

Answer: punnet square

Explanation: