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Magnesium, an alkaline earth metal reacts with water producing hydrogen gas. If one decides to collect...

Magnesium, an alkaline earth metal reacts with water producing hydrogen gas. If one decides to collect the hydrogen over water at 20oC and the total amount of gas collected is 0.639 L with a pressure of 1.11 atm, what is the amount of hydrogen in g in the sample? Note: the vapor pressure of water at 20oC is 17.5 torr. The balanced equation is: Mg(s) + 2 H2O(l) -> Mg(OH)2(aq) + H2(g) The mass of hydrogen collected over water is _____g.

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