Chapter 9

For the reaction represented by the equation Pb(NO3)2 + 2KI ® PbI2 + 2KNO3, how many moles of lead(II) iodide are produced from 300. g of potassium iodide and an excess of Pb(NO3)2?

0.904 mol

Which coefficients correctly balance the formula mc010-1.jpg?

1,1,2

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

Which equation is not balanced?

2H2 + O2 ---> H2O

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

3:2

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 2KClO3 ® 2KCl + 3O2, how many moles of potassium chlorate are required to produce 250. g of oxygen?

5.21 mol

For the reaction represented by the equation 2HNO3 + Mg(OH)2 ® Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3, and an excess of Mg(OH)2?

593 g

For the reaction represented by the equation AgNO3 + NaCl ® NaNO3 + AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO3?

7.0 mol

For the reaction represented by the equation 2Na + Cl2 ® 2NaCl, how many grams of chlorine gas are required to react completely with 2.00 mol of sodium?

70.9 g

When the formula equation mc012-1.jpg is correctly balanced the coefficient of Fe is number

9.

For the reaction represented by the equation Cl2 + 2KBr ® 2KCl + Br2, calculate the percentage yield if 200. g of chlorine react with excess potassium bromide to produce 410. g of bromine.

91.0%

For the reaction represented by the equation SO3 + H2O ® H2SO4, calculate the percentage yield if 500. g of sulfur trioxide react with excess water to produce 575 g of sulfuric acid.

93.9%

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

actual yield

To balance a chemical equation, it may be necessary to adjust the

coefficients.

What is the study of the mass relationships of elements in compounds?

composition stoichiometry

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

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

percentage yield

A chemist interested in the efficiency of a chemical reaction would calculate the

percentage yield.

What is the study of the mass relationships among reactants and products in a chemical reaction?

reaction stoichiometry

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

reaction stops.

A chemical equation is balanced when the

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

If the percentage yield is equal to 100%, then

the actual yield is equal to the theoretical yield.

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