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2H2 + O2--->2H2O
2 mole wody - 22,4dm3 tlenu
6 moli wody - X
X=67,2dm3 tlenu
2.
4P + 5O2--->2P2O5
4 mole fosforu - 284g P2O5
0,1 mola - X
X=7,1 g P2O5