Chapter 12 Stoichiometry

Using the following balanced equation: Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l) How many moles of iron can be made from 6.0 moles H₂ assuming there is excess Fe₂O₃?

• 4.0 moles Fe

• 6.0 moles Fe

• 9.0 moles Fe

• 2.0 moles Fe

Which setup of conversion factors shows the correct process in determining how many grams of iron can be created if the reaction below starts with 6.50 moles of Mg? 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe

• a

• b

• c

• d

If 55.6 grams of sodium hydroxide react with excess calcium carbonate, how many grams of Na₂CO₃ are produced in this reaction?

CaCO₃ + 2 NaOH → Ca(OH)₂ + Na₂CO₃

• 73.7 grams

• 27.8 grams

• 10.5 grams

• 295 grams

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NGSS.HS-PS1-7

In the following balanced chemical reaction: 4 Fe + O₂ --> 2 Fe₂O If you have 2.2 moles of Fe and 0.65 moles of O₂, which of the following statements is correct?

• Fe is limiting and 1.1 moles Fe₂O will be created.

• Fe is limiting and 1.3 moles Fe₂O will be created.

• O₂ is limiting and 1.1 moles Fe₂O will be created.

• O₂ is limiting and 1.3 moles Fe₂O will be created.

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NGSS.HS-PS1-7

What would be the correct numbers of products and leftovers? (In the order shown for the chemicals in the image)

• 4, 6, 6, 1

• 2, 3, 7, 4

• 2, 3, 1, 3

• 4, 6, 2, 5

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NGSS.HS-PS1-7

What would be the correct numbers of reactants? (In the order shown for the chemicals in the image)

• 7, 7

• 6, 3

• 1, 4

• 7, 10

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NGSS.HS-PS1-7

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the:

• theoretical yield

• mole ratio

• actual yield

• percentage yield

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NGSS.HS-PS1-7

If 2 moles of aluminum and 2 moles of chlorine are reacted, which chemical is the limiting reactant?

• AlCl₃

• Cl₂

• Al

Where are the numbers for a mole ratio found?

• They are part of the chemical formulas for the reactants and products.

• They are given in the problem.

• They are found on the periodic table for those elements.

• They are found as coefficients in the reaction's balanced chemical equation.

N₂ + 3H₂ → 2NH₃

How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6 mol

• 2 mol

• 3 mol

• 0.7 mol

Tags

NGSS.MS-PS1-5