Stoichiometry
Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are PvB and Pvw respectively. The partial pressure of benzene in air-vapour mixture is

XB.PvB
PvB
XB.Patm
(Patm - Pvw)xB

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Stoichiometry
Pick out the wrong unit conversion of thermal conductivity.

1 BTU/ft².hr.°F/inch = 1.488 kcal/m². hr.°C/m
1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F
1 BTU/ft².hr.°F/ft = 1.488 kcal/m². hr.°C/m

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