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2H2 + O2 --> 2H2O
MH2 = 2g/m
nH2 = 2 mole - na podstawie reakcji
mH2 = 2*2 = 4g
MH2O = 18g/m
nH2O = 2mole - na podstawie reakcji
mH2O = 2 * 18 = 36g
4g ---> 36g
50g ---> x
x = 450g
mol H2----- mol H2O
2g H2 ------ 18 g H2O
50g H2----- xg H2O
x=450g