Chemistry Chapter 9

For the reaction represented by the equation 2H2 + O2→ 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?

12 mol.

In the reaction represented by the equation N2 + 3H2→ 2NH3, what is the mole ratio of nitrogen to ammonia?

1:2

For the reaction represented by the equation C + 2H2→ CH4, how many moles of hydrogen are required to produce 10 mol of methane, CH4?

20 mol

The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) → 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?

3 mol.

What mass of PCl3 forms in the reaction of 75.0 g P4 with 275 g Cl2 ? P4+6Cl2=4PCl3

332.52g

The reaction of 100. g of salicylic acid, C7H6O3, with excess acetic anhydride produces 50.0 g of aspirin, C9H8O4, according to the equation below. What is the percentage yield for this reaction?

38.33%

In the reaction represented by the equation 2Al2O3→ 4Al + 3O2, what is the mole ratio of aluminum to oxygen?

4:3

For the reaction represented by the equation 2Fe + O2→ 2FeO, how many grams of iron(II) oxide are produced from 8.00 mol of iron in an excess of oxygen?

575 g

Unwanted reactions that can use up reactants without making the desired products are called _ reactions.

Unwanted reactions that can use up reactants without making the desired products are called side reactions.

What is the measured amount of a product obtained from a chemical reaction?

actual yield

If one knows the mole ratio of a reactant and product in a chemical reaction, one can

calculate the mass of the product produced from a known mass of reactant.

The units of molar mass are

g/ mol

In most chemical reactions the amount of product obtained is

less than the theoretical yield

Which reactant controls the amount of product formed in a chemical reaction?

limiting reactant

A balanced chemical equation allows one to determine the

mole ratio

What is the ratio of the actual yield to the theoretical yield, multiplied by 100%?

percentage yield

Reaction stoichiometry is based on _.

reactants and products

When the limiting reactant in a chemical reaction is completely used, the

reaction stops

The coefficients in a chemical equation represent the

relative numbers of moles of reactants and products.

A chemical equation is balanced when the

same number of each kind of atom appears in the reactants and in the products.

Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?

stoichiometry

In what kind of reaction do two or more substances combine to form a new compound?

synthesis reaction

Which of the following would be investigated in reaction stoichiometry?

the mass of potassium required to produce a known mass of potassium chloride

What is the maximum possible amount of product obtained in a chemical reaction?

theoretical yield

For the reaction represented by the equation Cl2 + 2KBr → 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?

1.00 mol