A geologist discovered fossils of marine animals in a layer of sedimentary rock in the desert. Based on this discovery, what conclusion can the geologist draw?

Answer:

A well tested explanation of a natural phenomenon

Explanation:

A scientific theory is an explanation of a natural phenomenon which has been drawn from a well tested observation.

Theories are products of repeated scientific experiments. When a hypothesis otherwise known as a "scientific guess" survives a lot of scrutiny, we can elevate it to the status of a theory. Most theories starts off from simple observations. These observations can further spark series of experiments in such a field and a scientific guess proposed. Further testing and experimenting would now lead to a theory.

Answer:

D. The nucleus of an atom of lithium splits, resulting in smaller fragments and the release of a large amount of energy.

Explanation:

Fission is the splitting of a nucleus, so this is the only option that involves fission.

A is wrong. Li atoms do not bond to form molecules. Instead, the nuclei are immersed in a sea of electrons.

B is wrong. The joining of two nuclei is fusion.

C is wrong. Adding an electron to an atom of lithium is not a nuclear reaction.

The nucleus of an atom of lithium splits, resulting in smaller fragments and the release of a large amount of energy. Therefore, option D is the correct answer.

Nuclear fission is a reaction in which a heavy nucleus splits into two or more smaller nuclei. Some characteristics features of nuclear fission are,

Thus, we can conclude that, in nuclear fission lithium atom is splits into smaller fragments with the release of a large amount of energy. Therefore, option D is the correct answer.

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Answer:

Pascals

Explanation:

Pascals are the unit for pressure

Answer:  Pascal

Explanation:  Pascal(Pa) is the unit of pressure according to Internataional Standard of units.

One Pascal is equivalent to the one newton(N) of force applied over an area of 1 metre squared(m2).

Thus when we are conducting an experiment on how increasing pressure during a deep sea dive affects gases in the blood, then Pascal is the most appropiate unit of measurement.

Answer:

Hydrogen gas  is evolved at the cathode and chlorine gas at the anode.

Explanation:

The solution will ionise.  Hydrogen ions, H+, will migrate to  the negative cathode ( where the current leaves the solution and chloride ions Cl- will migrate the the positive anode.

In the electrolysis of hydrochloric acid using platinum electrodes, the anode will release chlorine gas, and the cathode will release hydrogen gas.

In the electrolysis of hydrochloric acid, both electrodes (anode and cathode) will be made of platinum. When current is passed through the hydrochloric acid solution, at the anode, chloride ions (Cl-) will be oxidized to form chlorine gas (Cl2), and at the cathode, hydrogen ions (H+) will be reduced to form hydrogen gas (H2). Therefore, the platinum anode will release chlorine gas, and the platinum cathode will release hydrogen gas.

Answer:

the answer is letter d

Polyatomic ions are named similarly to monatomic ions in ionic compounds. No changes are made to the ending of the polyatomic ion. The name of the compound is formed by combining the cation and the anion.

Compounds containing polyatomic ions are named similarly to those containing only monatomic ions, except there is no need to change to an -ide ending, since the suffix is already present in the name of the anion. For example, if we have the compound NaNO3, it is named as sodium nitrate. Similarly, CaCO3 is named as calcium carbonate, and NH4Cl is named as ammonium chloride.

In ionic compounds, polyatomic ions are named similarly to monatomic ions. The ending of the polyatomic ion remains unchanged. The name of the compound is formed by combining the cation and the anion.

For example, in the compound sodium nitrate (NaNO3), the polyatomic ion is nitrate (NO3-). The name of the compound is formed by combining the cation (sodium, Na+) and the anion (nitrate, NO3-).

Similarly, in calcium carbonate (CaCO3), the polyatomic ion is carbonate (CO3^2-). The name of the compound is formed by combining the cation (calcium, Ca^2+) and the anion (carbonate, CO3^2-).

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Answer: The volume of gas is 24.9 L. The volume can be calculated using the Ideal Gas Equation which relates the pressure, volume, temperature, and amount of gas to each other.  

Further Explanation

The Ideal Gas Equation is:  

[tex]PV = nRT[/tex]

where:

P - pressure (in atm)

V - volume (in L)

n - amount of gas (in moles)

R - universal gas constant [tex]0.08206 \frac{L-atm}{mol-K}[/tex]

T - temperature (in K)

In the problem, we are given the values:

P = 0.80 atm (2 significant figures)

V =  ?

n = 0.75 moles (2 significant figures)

T = 50.0 degrees Celsius (3 significant figures)

We need to convert the temperature to Kelvin before we can use the Ideal Gas Equation. The formula to convert from degree Celsius to Kelvin is:

[tex]Temperature \ in \ Kelvin = Temperature\ in \ Celsius \ + \ 273.15[/tex]

Therefore, for this problem,

[tex]Temperature\ in \ K = 50.0 +273.15\\Temperature\ in \ K = 323.15[/tex]

Solving for V using the Ideal Gas Equation:

[tex]V = \frac{nRT}{P} \\V = \frac{(0.75\ mol) \ (0.08206 \ \frac{L-atm}{mol - K}) \ (323.15\ K) \ }{0.80 \ atm} \\V = 24.86\ L[/tex]

The least number of significant figures is 2, therefore, the final answer must have only 2 significant figures.  Hence, the volume is 24.9 L.

Learn More

1. Learn more about Boyle's Law https://brainly.com/question/1437490  

2. Learn more about Charles' Law https://brainly.com/question/1421697

3. Learn more about Gay-Lussac's Law https://brainly.com/question/6534668

Keywords: Ideal Gas Law, Volume, Pressure

The volume of a gas at 50.0°C and 0.80 atm, with 0.75 moles of the gas present, is 24.93 L.

The volume of a gas can be calculated using the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin. To calculate the volume, we can rearrange the equation to V = (nRT/P).

Using the given values, n = 0.75 moles, R = 0.08206 L-atm/mol-K, T = 50.0°C + 273.15 = 323.15 K, and P = 0.80 atm, we can plug them into the equation:

V = (0.75 mol x 0.08206 L-atm/mol-K x 323.15 K) / 0.80 atm = 24.93 L

Volume is a measure of the amount of space occupied by a three-dimensional object. It is typically measured in cubic units, such as cubic meters or cubic centimeters. The volume of an object can be calculated using various formulas, depending on the shape of the object. For example, the volume of a cube can be calculated using the formula V = s^3, where V is the volume and s is the length of one side of the cube. Similarly, the volume of a cylinder can be calculated using the formula V = πr^2h, where V is the volume, r is the radius of the base of the cylinder, and h is the height of the cylinder.

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Answer:

Explanation:

To determine the number of electrons that a single hydrogen gains or loses you need to realize that the chemical reaction is an oxidation-reduction (redox) reaction and state the changes in the oxidation states.

The substance that gains electrons is being reduced, reducing its oxidation number, and the substance that lose electrons is being oxidized, increasing its oxidation state.

1) State the oxidation state of hydrogen atoms in the rectant side:

2) State the oxidation state of the hydrogen atoms in the product side:

        Hence, in order to the molecule H₂O be neutral, the total charge contributed by the two atoms of hydrogen must be + 2: +2 - 2 = 0.

        Since there are two hydrogen atoms, each contributes +2 / 2 = +1 charge.

3) Conclusion:

Every atom of hydrogen changes from a 0 oxidation number to a +1 oxidation number, which, in turn, means that every hydrogen atom loses one electron.

Thus, the answer is, the option B. Lose 1.

Answer:

Lose 1

Explanation:

Answer via Educere/ Founder's Education

Answer:

A. 4.

Explanation:

no. of moles (n) = mass/molar mass.

mass = 64.0 g, molar mass = 16.0 g/mol.

∴ no. of moles (n) = mass/molar mass = (64.0 g)/(16.0 g/mol) = 4 mol.

Final answer:

To find the number of moles of methane in 64 grams, divide the mass by the molar mass of methane, which is 16.05 g/mol. The result is approximately 4 moles of CH₄. Option A

Explanation:

To calculate the number of moles in 64 grams of methane (CH₄), we need to use the molar mass of methane as a conversion factor. Methane has a molar mass of approximately 16.05 g/mol (carbon is 12.01 g/mol and hydrogen is approximately 1.008 g/mol × 4). Therefore, the calculation is as follows:

Number of moles of CH₄ = Mass of CH₄ ÷ Molar mass of CH₄

Number of moles of CH₄ = 64 g ÷ 16.05 g/mol

Number of moles of CH₎ = 3.9875 mol

When rounded to the nearest whole number, the number of moles of methane in 64 grams is approximately 4.

There will be only one solution for the angle. So, the correct option is D.

SSA or side-side-angle, triangle is a combination of triangles, where the length of two of the sides and the non-included angle between the two sides is known.

Here,

In SSA triangle, length of two sides and one angle will be known.

It is given that the length of the two sides is equal. Therefore the angles opposite to these sides will also be equal. Let the angle be x.

If the sides are equal, according to trigonometry, the non-included angle will be equal to 45°.

So, we can write that,

The sum of the angles,

45° + x + x = 180°

2x = 135

Therefore, x = 67.5°

Hence,

There will be only one solution for the angle. So, the correct option is D.

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Answer:

A

Explanation:

CH4+O2-CO2+ H20

that mean methane has burn in oxygen to produce CO2

Answer: Option (C)

Explanation: Hydrogen and Helium initially, both were present on the earth's atmosphere. But later they were reduced upto a huge extent. Due to the location of earth near to the sun, these gases must have evaporated from the earth's atmosphere. At present the amount of hydrogen and helium is very less.

Thus, the correct answer is option (C).

Answer:

It is C.

Explanation:

The atomic mass = number  of protons + number of neutrons

= 5 + 6 = 11. The number of protons = the number of electrons.

Final answer:

A boron atom with an atomic number of 5 and an atomic mass of 11 contains 5 protons, 5 electrons, and 6 neutrons.

Explanation:

An atom of boron has an atomic number of 5 and an atomic mass of 11. The atomic number tells us that there are five protons in the nucleus of a boron atom. Given that the atomic mass is the sum of the protons and neutrons, and the atomic mass of boron is 11, we can deduce that there must be 6 neutrons (11 - 5 = 6). Boron atoms also have an equal number of electrons as protons when they are neutral. Therefore, the correct composition of a neutral boron atom is 5 protons, 5 electrons, and 6 neutrons.

Boron has two naturally occurring isotopes, boron-10 and boron-11, which differ only in their number of neutrons. Isotopes are variants of the same element that have the same number of protons but a different number of neutrons. Boron's average atomic mass is calculated based on the relative abundance of its isotopes: 20% boron-10 (5 protons and 5 neutrons) and 80% boron-11 (5 protons and 6 neutrons).

Answer:

0.0447 moles of Aluminum

Explanation:

Break this down to an ionic equation (which may not exist in the real world but it will give you the mol ratios).

Al2(SO4)3 ===> 2Al^(+3) + 3 SO4^(-2)

Now write the equation showing the actual number of moles of SO4^(-2) present. Indicate the Al moles with an x

Al2(SO4)3 ===> 2Al^(+3) + 3 SO4^(-2)

                                x             0.0670  

Now set  up a proportion

2/x = 3/0.0670                             Cross multiply

2*0.0670 = 3x                              Simplify the left

0.134 = 3x                                     Divide both sides by 3

0.134/3 = 3x/3                              Divide

0.0447 = x

there are 0.0447 moles of Aluminum

Answer:

A) Alloys are mixtures with undefined proportions.

Explanation:

Alloys are different mixtures or different materials with no exact portion size.  

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B. 3.62 m3

PV = nRT

(0.1185 atm)V = (17 mol)(0.0821 L•atm/K•mol)(307.15 K)

0.1185V = 428.689

V = 3617.63 L

so for cubic meters, 1,000 liters equals 1 m^3. Simply divide the answer by 1,000.

The volume that this would occupy is 3.62 m^3.

volume is the measure of the capacity that an item holds. for example, if a cup can hold one hundred ml of water up to the brim, its volume is said to be one hundred ml. volume also can be defined as the amount of area occupied by a three-dimensional object.

volume refers to the amount of area the object takes up. In other words, volume is a measure of the size of an object, just like height and width are methods to describe size. If the object is hollow (in other words, empty), volume is the amount of water it can hold.

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Answer:

moles of NaCl per liter of solution.

Explanation:

Molarity can be defined as the no. of moles of solute dissolved per a 1.0 L of the solution.

Answer: moles of [tex]NaCl[/tex] per liter of solution

Explanation:

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

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

where,

n= moles of solute

[tex]V_s[/tex] = volume of solution in L

Square brackets represents the concentration of a substance i.e. amount of solute dissolved per liter of the solution.

Thus [tex]NaCl[/tex] represents moles of [tex]NaCl[/tex] per liter of solution.

Answer:

b. LD-75

Explanation:

You give the same dosage of chemicals A and B to a sample of test subjects.

Chemical A kills 75 % of the subjects, while chemical B kills only 25 %.

Chemical A, with LD-75, is more toxic.

LD-75 would be more toxic. Hence, option B is correct.

The quality of being toxic or poisonous.

You give the same dosage of chemicals A and B to a sample of test subjects.

Chemical A kills 75 % of the subjects, while chemical B kills only 25 %.

Chemical A, with LD-75, is more toxic.

Hence, option B is correct.

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Answer:

Water supply

Explanation:

When there is drought, which happens mostly within the tropics, water sources go dry. Plants and animals suffer alike. Animals have to scramble for the limited amount of water to quench their thirsts. Water is one of the basic requirements for the survival of living organisms like animals.

Answer:

water supply

Explanation:

Answer:

Explanation:

One of the assumptions of the kinetic molecular theory is that the gas particles are way smaller than the separtion between them and, in consequence, most of the volume in a gas is empty space.

This condition (that most of the volume in a gas is empty space) explains why the gases can be easily compressed: since there are vast unoccupied spaces when the pressure is increased, the particles can approach each other with which the total volume of the gas decreases.

Expandibility, the property of expanding, is the ability that gases have to occupy the entire space of the container in which they are located. The particles then will get separated leaving most of the space empty.

The fact that most of the volume in a gas is empty space means that the volume for a certain amount of particles is much larger than the volume that the same number of particles in a solid will occupy, driving to much lower densities.

Gases exhibit very low density, the ability to mix completely with other gases, and follow Avogadro's hypothesis, all of which support the assumption that a gas is mostly empty space.

Properties of Gases and Empty Space

The properties of gases we observe can indeed support the assumption that most of the volume of a gas is empty space. One key property is the fact that gases have a very low density compared to liquids and solids. This low density occurs because the gas particles, which have mass, make up only a tiny fraction of the gas's volume. The rest is empty space that can be compressed or expand when the pressure or temperature changes.

Another supportive property is the ability of gases to mix completely with one another, without any significant interference from the size of their particles. This behavior also indicates that there is a lot of space between particles, allowing them to move freely and intermingle.

Moreover, Avogadro's hypothesis suggests that equal volumes of all gases, at the same temperature and pressure, contain equal numbers of molecules, thus underscoring the concept of empty space in gases since these molecules occupy negligible space compared to the whole volume.

Answer: different charges but same mass

protons and neutrons determine the mass (electrons are too light)

since atom q and atom r are of the same proton and neutron , they are of the same mass

protons and electrons determine the charge

a proton has a 1+ and electron has a 1- charge

atom q has no charge, the protons and electrons cancel each other out

atom r has a 1- charge as there is one more electron than proton.

Answer : Thecorrect option is, They have different charges and same masses.

Explanation :

As we know that an atom is the smallest unit of a matter that consist of three subatomic particles which are electrons, protons and neutrons.

The protons and the neutrons are located inside the nucleus or center of the nucleus where the mass of the an atom is concentrated and the electrons are located around the nucleus.

The protons are positively charged, the electrons are negatively charged and the neutrons are neutral that means it has no charge.

Atomic number : It is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number : It is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

From the given data we conclude that:

Atom Q has 11 number of protons, electrons and 12 number of neutrons.

Atom R has 11 number of protons, 10 number of electrons and 12 number of neutrons.

Atom Q has no charge but Atom R has (+1) charge due to loss of 1 electron. That means, they have different charges.

Mass of Atom Q = Number of neutrons + Number of protons = 11 + 12 = 23

Mass of Atom R = Number of neutrons + Number of protons = 11 + 12 = 23

Thus, the correct option is, They have different charges and same masses.

Answer:

Concentration

Explanation:

Amount of substance concentration often called simply concentration, is a quantitative measure of the number of atom s per unit volume in a sample of a matter.

Answer:

3.75 grams of methane

Explanation:

Given parameters:

Mass of oxygen gas = 5g

Mass of CH₄ = 5g

Unknown parameters:

Amount of excess reactant = ?

Solution

In order to find the amount of leftover reactant we need to know  the reactant that is in excess and in limited supply. The amount of reactant in short supply will determine the extent of the reaction.

Now, we need to write the balanced reaction equation:

                   CH₄ + 2O₂ → CO₂ + 2H₂O

We first find the number of moles of the reactants.

Number of moles of methane = [tex]\frac{mass}{molar mass}[/tex]

Number of moles of methane =  [tex]\frac{5}{16}[/tex] = 0.3125mole

Number of moles of oxygen = [tex]\frac{5}{32}[/tex] = 0.156mole

    From the equation:

      1 mole of methane reacts with 2 moles of oxygen gas

      x moles of methane reacts with 0.156moles of oxygen gas

                2x = 0.156

                  x = 0.078moles

We see that the methane is in excess and oxygen gas is in short supply in the reaction.

The amount of excess methane = 0.3125 - 0.078 = 0.2345moles

Now we convert it to mass:

  Mass = number of moles x molar mass = 0.2345 x 16 = 3.75grams

Answer:

3.75 grams of methane

Explanation:

Got it right on the exam

Answer:

C. 2-methylpropane

Explanation:

There are rules guiding the naming of hydrocarbons. Some of the rules are:

1.) The longest continuous chain is the parent chain:

The longest chain here is made up of 3-carbon atoms which is a propane compound

2.)The carbon atoms are numbered in the parent chain to indicate where branching or substitution takes place.

Here, it is in the second carbon atom in propane.

The branched group is methyl- which is a methane molecule that has lost a hydrogen atom.

This makes ths name of the compound to be:

2-methylpropane

Answer: C.

Explanation:

The volume of carbon dioxide gas changes from 6.75 L to b) 10.7 L when the pressure is decreased from 175 atm to 110 atm, as per Boyle's Law.

The student asks how the volume of carbon dioxide gas changes when the pressure is decreased from 175 atm to 110 atm, assuming constant temperature and number of gas particles. This is a classic application of Boyle's Law in the study of gas laws, which can be expressed in the equation P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume respectively. Given the initial conditions (P1 = 175 atm and V1 = 6.75 L) and final pressure (P2 = 110 atm), we can solve for the new volume V2.

Using Boyle's Law:

Therefore, the new volume is b)  10.7 L when the pressure is decreased to 110 atm.

Answer:

Explanation

=============

One

=============

Ca(OH)2 + 2HNO3 -----> Ca(NO3)2 + H2O

Focus on the NO3. This is an odd problem and you usually do not focus on the complex ion. But this one works easiest if you do.

The problem now is going to be the oxygens. There are 2 with the Calcium and only 1 free one going to the water. (The NO3 has been taken care of in the last step).

Ca(OH)2 + 2HNO3 -----> Ca(NO3)2 + 2H2O

Count the atoms. I think this equation is balanced.

atom                      Left              Right         Result

Ca                            1                    1               Balanced

O                              8                   8              Balanced

H                              2 + 2              2*2         Balanced

N                               2                    2            Balanced

===========

Two

===========

CH4 + O2====>  CO2 + H2O

Start with the hydrogens.

The right side requires a 2

CH4 + O2 ===>  CO2 + 2H2O

Now look at the oxygens. There are 4 on the right. and only 2 on the left. You need to multiply O2 by 2

CH4 + 2O2 ===>  CO2 + 2H2O

Each side has 1 Carbon 4 hydrogens and 4 oxygens. The equation is balanced.

Answer:

B.

Explanation:

If the concentration of acid is decreased the reaction rate will slow down as the hydrogen ion concentration will decrease.

Answer:

B. The reaction rate will slow down.

Explanation:

As concentration increases, rate of the reaction will increase. When there are more particles present in a system, more collision will take place.

As collision increases, rate of the reaction will increase. Concentration makes the molecules to come closer together thus leading to more collisions.

Rate of the reaction is directly proportional to the reactant collisions.

Orientation of the molecule and molecule possessing enough energy  will lead to increased number of collisions thereby increasing the rate of the reaction .

So, Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate

Answer:

0.187kg

Explanation:

Given parameters:

Percentage compostion of bauxite in ore = 54%

Mass of ore = 1kg

Unknown:

Mass of Al that can be extracted from the ore = ?

Solution

Bauxite is an ore of Aluminium. It is made up of several minerals from with aluminium can be extracted in economic amount. Some of these minerals are gibbsite, boehmite, diaspore etc. Let us assume that the ore we are dealing with contains chiefly gibbsite.

The formula of Gibbsite is Al(OH)₃

We know that 54% of the ore is made up of bauxite and the remaining 46% of the ore will form the gangue(not useful part of the ore)>

Let us find the mass of the bauxite contained in the ore:

  Mass of bauxite = [tex]\frac{54}{100}[/tex] x 1kg = 0.54kg

Since we know the mass of bauxite in the ore now, we can estimate the mass of the aluminium in the ore.

First, we find the molar mass of the gibbsite:

Molar mass of Al(OH)₃ = 27 + 3(16 + 1) = 78gmol⁻¹

Atomic mass of aluminium is 27

Mass of aluminium that could be extracted = [tex]\frac{27}{78}[/tex] x 0.54

                                                                       = 0.346 x 0.54

                                                                       = 0.187kg

14.7 g of chromium are need to produce 27.0 g of copper in the reaction:

2 Cr + 3 CuSO4 → Cr2(SO4)3 + 3 Cu. In this reaction, chromium is the limiting reactant and CuSO4 is the excess reactant.

Further Explanation:

The problem given is an example of a stoichiometry problem. Stoichiometry involves the determination of the amounts of products formed and amount of reactants consumed in a chemical reaction. It uses the ratio of the reactants and products given by the balanced chemical equation.

Limiting reactant is the reactant that determines how much of the product(s) will be obtained. In this problem, chromium is the limiting reactant.

To solve the amount of limiting reactant we use several steps:

STEP 1: Convert mass to moles using the equation below:

[tex]no. \ of \ moles \ = given \ mass \ (\frac{1 \ mole}{molar \ mass})[/tex]

For this problem,

[tex]no. \ of \ moles \ Cu \ = 27.0 \ g \ Cu \ (\frac{1 \ mole \ Cu}{ 63.55 \ g}) \\\boxed {no. \ of \ moles \ Cu \ = 0.4249}[/tex]

STEP 2: Calculate the number of moles of Cr used up using the stoichiometric ratio from the balanced equation: 3 moles Cu: 2 moles Cr

[tex]moles \ of \ Cr \ = given \ moles \ Cu (\frac{2 \ mol \ Cr}{3 \ mol \ Cu})\\moles \ of \ Cr \ = \ 0.4249\ mol\ Cu (\frac{2 \ mol \ Cr}{3 \ mol \ Cu})\\ \\\boxed {moles \ of \ Cr \ = \ 0.2832 }[/tex]

STEP 3: Convert moles of Cr to mass (in grams).

[tex]mass \ = given \ moles \ (\frac{molar \ mass}{1 \ mole})\\[/tex]

To get the mass of Cr,

[tex]mass \ of \ Cr \ = 0.2832 \ mol \ (\frac{52.00 \ g}{1 \ mol})\\\boxed {mass \ of \ Cr \ = 14.7 \ g}[/tex]

Learn More

Keywords: excess reactant, limiting reactant

The mass of chromium, Cr needed to react with excess CuSO₄ to produce 27 g of Cu is 14.7 g

2Cr + 3CuSO₄ → Cr₂(SO₄)₃ + 3Cu

Molar mass of Cu = 52 g/mole

Mass of Cr from the balanced equation = 2 × 52 = 104 g

Molar mass of Cu = 63.5 g/mole

Mass of Cu from the balanced equation = 3 × 63.5 = 190.5 g

SUMMARY

From the balanced equation above,

190.5 g of Cu were produced from 104 g of Cr

From the balanced equation above,

190.5 g of Cu were produced from 104 g of Cr

Therefore,

27 g of Cu will be produce by = (27 × 104) / 190.5 = 14.7 g of Cr

Thus, 14.7 g of Cr is needed for the reaction

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Answer:

0.666 mol I

Explanation:

0.333 mol CaO(IO₃)₂ × (2 mol IO₃ / mol CaO(IO₃)₂) = 0.666 mol IO₃

0.666 mol IO₃ × (1 mol I / mol IO₃) = 0.666 mol I