250- sample of a magnesium-aluminum alloy dissolves completely in an excess of . When the liberated is collected over water at 29 and 752 , the…

A 0.250- sample of a magnesium-aluminum alloy dissolves completely in an excess of . When the liberated is collected over water at 29 and 752 , the volume is found to be 317 . The vapor pressure of water at 29 is 30.0 . How many moles of H2 can be produced from grams of in magnesium-aluminum alloy? The molar mass of is 24.31 .