A sample of magnesium metal which is having the 0.0677 g reacted with excess the hydrochloric acid to make the 69.9 ml of hydrogen gas. At 21.0 o C the gas was collected over the water and the levels of water outside and inside the gas collecting tube are identical. At 21.0 o C the water vapor pressure is having 18.6 mm Hg and is having the atmospheric pressure 755 mm Hg. Determine the experimental molar volume of hydrogen gas at the STP.