Science : I need homework help

Magnesium metal reacts with aqueous HCl to give H 2 gas:

Mg( s) + 2 HCl( aq)  MgCl 2( aq) + H 2( 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). 

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