Description
Magnesium metal reacts with aqueous HCl to give H2 gas: Mg(s) + 2 HCl(aq) MgCl2(aq) + H2(g)The gas that forms is found to have a volume of 3.557 L at 25°C and a pressure of 747 mm(Hg). The vapor pressure of water at 25°C is 23.8 mm(Hg). (a) What is the partial pressure of the H2 gas?
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Explanation & Answer
DATA:
747 mm of Hg is the total pressure created by Hydrogen gas and steam, so,
Ptotal = 747 mm of Hg
vapor pressure of water is it's partial pressure
Pwater = 23.8 mm of Hg
Phydrogen = ?
SOLUTION:
Ptotal = Pwater + Phydrogen
Phydrogen = Ptotal - Pwater
Phydrogen = 747 mm of Hg – 23.8 mm of Hg
Phydrogen = 723.2 mm of Hg
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