Stoichiometry
40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is

1/4
2/3
1/3
1/2

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Stoichiometry
Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the

Vapor follows the ideal gas law
Volume in the liquid state is negligible compared with that in the vapor state
Molal latent heat of vaporisation is constant within the limited temperature range
All of these

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