Posted by Hannah on Thursday, January 13, 2011 at 2:52am.
Start from the equation for the reaction
O2 + 2H2 -> 2H2O
so 1 mole of O2 reacts with 2 moles of H2.
75 g of H2 gas contains
75 g/2 g mole^-1 = 37.5 mole
this will react with 37.5 mole/2 moles of O2 (from the equation)
hence calculate the number of grams of O2 gas (molar mass = 32 g mole^-1)
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