Stoichiometry
'Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the

Log (temperature) vs. log (vapor pressure)
Vapor pressure vs. log (temperature)
Temperature vs. log (vapor pressure)
Vapor pressure vs. temperature

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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

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

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