A 0.0677 g sample of magnesium metal reacted with excess hydrochloric acid solution to produce
69.9 mL of hydrogen gas. The gas was collected over water at 21.0° C. The levels of water inside
and outside the gas collecting tube are identical (meaning that the pressure exerted by liquid
water in the gas measuring tube is 0). The vapor pressure of water at 21.0°C is 18.6 torr and the
atmospheric pressure is 755 torr. Calculate the experimental molar volume of hydrogen gas at
STP.
Reaction Equation _______________________________________________________________________