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