31.47 mL of hydrogen gas was collected over water, at 200C and 774-mmHg atmospheric pressure, when 0.0321 g of magnesium was reacted according to the following equation:
Mg (s) + 2 HCl (aq) MgCl2(aq) + H2(g)
The pressure of water vapor at 20 0C is 18 mmHg.
The gas colleted over water is not pure as during the reaction water also gets evaporated due to the heat produced and get mixed with the gas above in form of vapours .
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