Stoichiometry
Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules

Do work equal to loss in kinetic energy
Do not exert attractive force on each other
Are above the inversion temperature
Do not lose energy on collision

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Stoichiometry
At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be

Significantly less than 4.69 atm
Nearly equal to 4.69 atm
Indeterminate due to lack of data
Significantly more than 4.69 atm

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