V(H2)=1lit & V(O2)=1lit
Before reaction,
2H21 lit+O21 lit→2H2O(l)0
After reaction,
2H20+O21−1/2 lit→2H2O(l)1 lit
∴ Volume of O2 remained = 12 lit
∴ Mole of O2=1222.4=144.8
Wt. of O2=148.8×32g=0.7143g
Also moles of H2O produced from 122.4 moles of H2=122.4
∴Wt produced=122.4×18=0.8036g
At 1000C, water becomes gas
∴ Total volume of gases = 1+12=32lit
∴ PV=nRT
P=nRTV=(144.8+122.4)×0.0821×37332
=1.34 atm=1018.4 mm of Hg