The heat of vaporization of water Qw is equal to heat gained by aluminum Qal.
"Qw=Qal"
"Mw*cv*dTw=mal*cp*dTal"
where; Mw is the mass of water, cv is the heat of vaporization of water, dT is the change in temperature, mal is the mass of aluminium, cp is the heat capacity of aluminum.
"Mw=(mal*cp*dTal)\/ (cv*dTw"
Mw = (88*0.903*372)/ (40.7*100)
Mw =7.26g
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