

Stoichiometry - Engineering
Q1: 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 beA significantly less than 4.69 atm.
B nearly equal to 4.69 atm.
C significantly more than 4.69 atm.
D indeterminate due to lack of data
ANS:C - significantly more than 4.69 atm. To predict the vapor pressure of methylcyclohexane at 150°C, we can use the Clausius-Clapeyron equation, which relates the vapor pressure of a substance to its temperature and the latent heat of vaporization. The equation is as follows: ln(𝑃2𝑃1)=−Δ𝐻vap𝑅(1𝑇2−1𝑇1)ln(P1P2)=−RΔHvap(T21−T11) Where:
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