2h2+o2=2h2o
n(h2o)=m(h2o)/M(h2o)=7.2/18=0.4mol
n(h2)=n(h2o)=0.4mol
V(h2)=n(h2)*Vm=0.4*22.4=8.96litr
n(o2)=1/2n(h2o)=1/2*0.4=0.2mol
V(o2)=n(o2)*Vm=0.2*22.4=4.48litr
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2h2+o2=2h2o
n(h2o)=m(h2o)/M(h2o)=7.2/18=0.4mol
n(h2)=n(h2o)=0.4mol
V(h2)=n(h2)*Vm=0.4*22.4=8.96litr
n(o2)=1/2n(h2o)=1/2*0.4=0.2mol
V(o2)=n(o2)*Vm=0.2*22.4=4.48litr