Honors Chem—Chapter 12 study guide
14W
Name:_______________________________________________ Date: __________________
1. Convert from amount of one substance to another based on the balanced chemical
reaction.
Na2SiO3(s) + 8 HF (aq)  H2SiF6 (aq) + 2 NaF(aq) + 3 H2O (l)
a. How many moles of HF are needed to react with 4.2 mol of Na2SiO3?
b. How many grams of HF are needed to react with 3.2 mol of Na2SiO3?
c. How many grams of NaF can be produced from 0.56 mol of HF?
d. How many grams of H2O can be produced from 1.6 g of HF?
e. Why do the problems say “can be” rather than “are”?
2. Give the molar mass, in correct units, of FeC6H4(COOH2)3. Round to the nearest whole
number.
3. Answer the following questions about the balanced reaction given below.
K2SO3 (aq) + 2 HNO3 (aq) ---> 2 KNO3 (aq) + SO2 (g) + H2O (g)
a. What is the mole ratio between K2SO3 and all other compounds?
b. If you have 6 mol K2SO3, how many moles of HNO3 do you need to react?
c. If you are told K2SO3 is the limiting reagent and you have 2.3 g of this compound,
how many moles of H2O can you theoretically produce?
d. Referring to c, how many grams of H2O is this?
4. Find the limiting reagent of the following balanced equation.
Mg(OH)2 (aq) + 2 HCl (aq)  MgCl2 (s) + 2 H2O (l)
a. What is the limiting reagent when reacting 96g of Mg(OH)2 and 104g of HCl?
5. The reaction of fluorine gas and ammonia gas (NH3) produces gaseous dinitrogen
tetrafluoride and hydrogen fluoride gas (HF).
a. Write the balanced chemical equation with correct states of matter for each
compound.
b. If you have 24.1 g of NH3, how many grams of fluorine gas are required to react?
c. How many grams of the limiting reagent, NH3, are required to produce 640g of
hydrogen fluoride?
6. When 48.0 g of silicon dioxide is heated with excess carbon, 24 g of silicon carbide is
measured in the lab.
SiO2(s) + 3 C (s)  SiC (s) + 2 CO (g)
a. What is the percent yield of this reaction?
b. How would you describe the quality of this yield? (Write the letter in the box.)
7. Define a claim (and what supports it), a rebuttal, and a counterargument.