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CGP EDU Academic Team
Published on: August 14, 2026
A 40 ml of a mixture of H2 and O2 at 18 0 C and 1 atm pressure was sparked so that the formation of waterwas complete. The remainingpure gas had a volume of 10 ml at 18ºC and 1 atm pressure. If the remaining gas was H2, the mole fraction of H2 in the 40 ml mixture is :
Text Solution
Verified by ExpertsThe correct answer is:
A
H2 +1/2O2 
H2O(l)
a b 0
a–2b 0 b
Reaction is studied at constant P &T.
a+b = 40 a–2b = 10
a = 30 ml b = 10ml
mole fraction of H2 = volume fraction of H2 =30/40 = 0.75.
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