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November 22, 2014

Homework Help: Chemistry

Posted by K on Thursday, February 10, 2011 at 1:25am.

A 0.0677g sample of magnesium metal reacted with excess hydrochloric acid to produce 69.9 ml of hydrogen gas. The gas was collected over water at 21.0 degrees Celsius. The levels of water inside and outside the gas collecting tube is identical. The water vapor pressure at 21.0 degree Celsius is 18.6 mmHg and the atmospheric pressure is 755 mmHg. Calculate the experimenal molar volume of hydrogen gas at STP. Write a balanced chemical equation for the reaction.

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