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120g Ca + xdm3 O2
2 mole Ca - 1 mol O2
80g. Ca - 22,4 dm3 O2
120g. Ca - x dm3 O2
x= 33,6 dm3 O2
2Ca + O2---->2CaO
2*40g Ca--------22,4dm3 O2
120g Ca---------xdm3 O2
x=120*22,4/80
x=33,6dm3 O2