What is the boiling point of cyclohexane at 620 mmhg?

At atmospheric pressure i.e. 760 mmHg the b.pt of cyclohexane = 81.4 C

To calculate the b.pt at 620 mmHg use the following relation:

BP(at 610 mmHg) = BP(760 mmHg) - (P(observed)-760 )*0.037 C/mm

BP = 81.4 -(620-760)*0.037 = 85.5 C

Boiling point of cyclohexane at 620 mmHg = 85.5 C

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