Chemistry Chegg Worksheet

ENGR 1540 Worksheet 10 Chapter 4

1. For the following reactions, write the ratios that can be established among molar amounts of the various compounds.

a. 2H2+O2→2H2O

b. 2H2O2→2H2O+O2

c. P4+5O2→P4O10

d. 2KClO3→2KCl+3O2

2. In an experiment carried out at very low pressure, 1.3×1015 molecules of H2 are reacted with acetylene, C2H2, to form ethane, C2H6, on the surface of a catalyst. Write a balanced chemical equation for this reaction. How many molecules of acetylene are consumed?

3. Sulfur, S8, combines with oxygen at elevated temperatures to form sulfur dioxide.

a. Write a balanced chemical equation for this reaction.

b. If 200 oxygen molecules are used up in this reaction, how many sulfur molecules react?

c. How many sulfur dioxide molecules are formed in part (b)?

4. How many moles of oxygen can be obtained by the decomposition of 7.5 mol of reactant in each of the following reactions?

a. 2KClO3→2KCl+3O2

b. 2H2O2→2H2O+O2

c. 2HgO→2Hg+O2

d. 2NaNO3→2NaNO2+O2

e. KClO4→KCl+2O2

5. In petroleum refining, hydrocarbons are often manipulated by reacting them with H2(g). If hexene, C6H12, is reacted with hydrogen to form hexene, C6H14, how many moles of hydrogen are needed to react with 453 moles of hexene?

6. For the following reactions, determine the value of x.

a. 4C+S8→4CS2

3.2 mol S8 yields x mol CS2

b. CS2+3O2→CO2+2SO2

1.8 mol CS2 yields x mol SO2

c. N2H4+3O2→2NO2+2H2O

7.3 mol O2 yields x mol NO2

d. SiH4+2O2→SiO2+2H2O

1.3×10-3 mol SiH4 yields x mol H2O

7. The combustion of liquid chloroethylene, C2H3Cl, yields carbon dioxide, steam, and hydrogen chloride gas.

a. Write a balanced equation for the reaction.

b. How many moles of oxygen are required to react with 35.00 g of chloroethylene?

c. If 25.00 g of chloroethylene reacts with an excess of oxygen, how many grams of each product are formed?

8. What mass of the unknown compound is formed in the following reactions? (Assume that reactants for which amounts are not given are present in excess.)

a. C2H4+H2→C2H6

3.4 g C2H4 reacts to produce x g C2H6

b. CS2+3Cl2→CCl4+S2Cl2

5.78 g Cl2 reacts to produce x g S2Cl2

c. PCl3+3H2O→H3PO3+3HCl

3.1 mg PCl3 reacts to produce x mg HCl

d. B2H6+3O2→B2O3+3H2O

4.6 kg B2H6 reacts to produce x kg B2O3

9. Many metals react with halogens to give metal halides. For example, iron reacts with chlorine to give iron(II) chloride, FeCl2:

Fe(s)+Cl2(g)→FeCl2(s)

Beginning with 10.0 g iron, what mass of Cl2, in grams, is required for complete reaction? What quantity of FeCl2, in moles and in grams, is expected?

10. Phosgene is a highly toxic gas that has been used as a chemical weapon at times in the past. It is now used in the manufacture of polycarbonates, which are used to make compact discs and plastic eyeglass lenses. Phosgene is produced by the reaction, CO+Cl2→COCl2. Given an excess of carbon monoxide, what mass of chlorine gas must be reacted to form 4.5 g of phosgene?