Properties of Gases  Take Home Quiz 6
1. A student reacted Zn(s) with HCl(aq) and collected (x) mL of H_{2}(g)over water at 24 ^{o}C. The total pressure was determined to be 746 torr.
a. Draw a diagram representing the hydrogen gas collected over water. Label all relevant parameters.
b.Given that the other product, besides hydrogen gas, was zinc chloride(aq), write a balanced chemical equation for this reaction.
c.Calculate the mass of zinc (in grams) that had to react with HCl (aq) to produce the H_{2} that was collected. You will need to use the table of vapour pressures of water from chem activity 16.
2. Consider two flasks connected by a stopcock. One has a volume of 1.00 L and contains Ar (g) at a pressure of 730. mm Hg and the other flask has a volume of 1.50 L and contains He (g) at a pressure of (y) mm Hg. The stopcock is opened so that the two gases mix completely.
a. Draw a diagram representing the two flasks connected by a stopcock. Label all relevant parameters.
b. Calculate the partial pressures of Ar (g) and He (g) and the total pressure of the resultant mixture.
Variables 




Carl Doige, Okanagan College, cdoige@okanagan.bc.ca