Limiting Management Practice Problems Lab Report

LIMITING REAGENT Practice Problems

1. At high temperatures, sulfur combines with iron to form the brown-black iron (II) sulfide:
Fe (s) + S (l) ( FeS (s)

In one experiment, 7.62 g of Fe are allowed to react with 8.67 g of S. a. What is the limiting reagent, and what is the reactant in excess? b. Calculate the mass of FeS formed.

2. Arcylonitrile, C3H3N, is the starting material for the production of a kind of synthetic fiber acrylics) and can be made from propylene, C3H6, by reaction with nitric oxide, NO, as follows:

4 C3H6 (g) + 6 NO (g) → 4 C3H3N (s) + 6 H2O (l) + N2 (g)

What mass of C3H3N can be made when 21.6 g of C3H6 react with 21.6 g of nitric oxide?

3. Calculate the percent yield for the reaction: P4 (s) + 6 Cl2
8. Calculate the percent yield for an experiment in which 5.50 g of SOCl2 was obtained in a reaction of 5.80 g of SO2 with excess PCl5. Use the following equation:

SO2 (l) + PCl5 (l) → SOCl2 (l) + POCl3 (l).

9. Chlorine gas reacts with silica, SiO2, and carbon to give silicon tetrachloride and carbon monoxide. a. Balance the following equation: Cl2 (g) + SiO2 (s) + C (s) → SiCl4 (l) + CO (g) b. How much CO gas can be produced from 15.0 g of silica?

10. When iron (II) hydroxide is mixed with phosphoric acid, iron (II) phosphate precipitate results. a. Balance the following equation: Fe(OH)2 (aq) + H3PO4 (aq) → Fe3(PO4)2 (s) + H2O (l) b. If 3.20 g of Fe(OH)2 is treated with 2.50 g of phosphoric acid, what is the limiting reagent and what is the reactant in excess? c. How many grams of Fe3(PO4)2 precipitate can be formed? d. If 3.99 g of Fe3(PO4)2 is actually obtained, what is the percent