NAME__________________________________
PER________
Stoichiometry: Mole-Mass/Mass-Mole Problems
(Show your work and Balance when needed)
1. How many grams of NaF form when 0.52 mol of HF reacts with excess Na2SiO3?
HF + Na2SiO3  NaF + H2SiO3
2. How many moles of Iron oxide are needed to produce 150 g of Iron?
Fe2O3
+
CO

Fe
+
CO2
Use the following reaction for both questions 3 and 4:
4 Al + 3 O2  2 Al2O3
3. How many grams of aluminum oxide would form if 12.5 moles of aluminum burned?
4. How many moles of oxygen are needed to react with 100.0 grams of aluminum?
Use the following reaction for both questions 5 and 6:
C3H8 + 5 O2  3 CO2 + 4 H2O
5. If 100.0 grams of C3H8 burns, how many moles of carbon dioxide will form?
6. How many grams of oxygen are needed to burn 5.0 moles of C3H8?
NAME__________________________________
PER________
7. Lead (II) acetate reacts with Hydrosulfuric acid to produce Lead (II) sulfide and Acetic acid.
How many grams of PbS are produced when 5.0 moles of H2S is reacted?
8. Given the following equation: 2 NaClO3 ---> 2 NaCl + 3 O2
a. 12.00 moles of NaClO3 will produce how many grams of O2?
b. How many moles of NaCl are produced when 80.0 grams of O2 are produced?
9. The combustion of Butane (Lighter fluid, C4H10) has the following equation:
C4H10 + O2 
CO2 + H2O
a. How many moles of oxygen were used up when 2.46 g of water were produced?
b. How many grams of CO2 are formed when 21.1 moles of oxygen are used up?
10. Ammonia (NH3) reacts with oxygen to produce Nitrogen monoxide and water.
How many moles of oxygen are needed to react with 56.8 grams of ammonia by this
reaction?
Answers: 1) 21.8 g NaF 2) 1.3 mol Fe2O3 3) 637.5 g Al2O3 4) 2.8 mol O2 5) 6.8 mol CO2 6) 800 g O2
7) 1196.5 g PbS 8a) 576 g O2 8b) 1.7 mol NaCl 9a) 0.18 mol O2 9b) 571.3 g CO2 10) 4.2 mol O2