STOICHIOMETRY PRACTICE PROBLEMS--II
1. In the reaction shown here, what weight of iron is needed to react completely with 32.0 g of sulfur? Fe + S à FeS
2. 100.0 g of hydrochloric acid is added to 50.0 g of iron (II) sulfide. What mass of hydrosulfuric acid is produced? FeS + 2HCl à FeCl2 + H2S
**FeS is the limiting reactant because it produced the least amount of H2S.
3. What volume of oxygen gas is produced by the decomposition of 100.0 g of sodium nitrate?
2NaNO3 à 2 NaNO2 + O2
4. What volume of carbon dioxide is required to produce 50.0 L of carbon monoxide according to the following reaction? CO2 + C à 2CO
5. Aluminum metal is heated with oxygen gas to produce aluminum oxide. What mass of aluminum oxide can be obtained from 25.0 g of aluminum?
4Al + 3O2 à 2Al2O3
6. When steam (hot water) reacts with iron metal, hydrogen gas and iron(III) oxide are produced. What mass of steam would be needed to react completely with 100.0 g of iron?
3H2O + 2Fe à 3H2 + Fe2O3
7. When ammonia (NH3) is reacted with oxygen, nitrogen gas and water are produced. What volume of ammonia will react completely with 25.0 g of oxygen? What volume of nitrogen gas is formed?
4NH3 + 3O2 à 2N2 + 6H2O
8. If 4.10 g of chromium is heated with 9.30 g of chlorine, what mass of chromium (III) chloride will be produced?
2Cr + 3Cl2 à 2CrCl3
**Cr is the limiting reactant because it produces the least amount of product
9. If you start with 23.5 g of oxygen and 46.4 L (at STP) of acetylene, what is your limiting reactant? Make sure to justify your answer with calculations.
2C2H2 + 3O2 à 2H2O + 4CO2 (balance the equation)
**Oxygen is the limiting reactant**