2H2+o2-->2H2o
M(o2)=2M(H2O)=2,5моль
n(H2o)=18г/моль
m=nM
m=18*2,5=45
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2H2+o2-->2H2o
M(o2)=2M(H2O)=2,5моль
n(H2o)=18г/моль
m=nM
m=18*2,5=45