Q13 The vapour pressure of the ketone carvone (Mr = 150.2 g mol-1), a component of spearmint oil, is as follows:

T / oC 57.4 100.4 133.0 157.3 203.5 227.5

p/ Torr 1.00 10.0 40.0 100 400 760

The Clausius-Clapeyron equation can be written in the straight-line

form:

ln P = vap,m/R) 1/T + c

(where c is a constant, T is temperature measured in degrees Kelvin))

(a) Plot a suitable graph to determine the molar enthalpy of vaporisation vap,m ) of carvone. (12 marks)

(b) What is the normal boiling point of carvone?

T / oC 57.4 100.4 133.0 157.3 203.5 227.5

p/ Torr 1.00 10.0 40.0 100 400 760

The Clausius-Clapeyron equation can be written in the straight-line

form:

ln P = vap,m/R) 1/T + c

(where c is a constant, T is temperature measured in degrees Kelvin))

(a) Plot a suitable graph to determine the molar enthalpy of vaporisation vap,m ) of carvone. (12 marks)

(b) What is the normal boiling point of carvone?

## This question was asked on Jan 03, 2013.

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