When 20ml of methane and 20ml of oxygen are exploded together and the reaction mixture is cooled to laboratory temperature. The resulting volume of the mixture
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Solution
CH4 +2O2 -> CO2+ 2H2O
1mol of methane reacts with 2 moles of O2 to give 1mol of CO2.
By Gay Lussacs law 2vol of O2 react with 1vol of CH4
1ml of CH4 react with 2ml of O2 to give 1ml of CO2
10ml of CH4 react with 20ml of O2 to give 10ml of CO2
Vol. of CH4 left=10ml Vol.of CO2 formed=10ml
Here water formed is in gaseous phase,so vaporises.