Chem Help pleeeease....?

Question

The normal boiling point of acetone is 56.2 degrees C and its Delta H is 25.5 kJ/mol. At what temperature does acetone have a vapor pressure of 360 mmHg.

I have been using the Clausius-Clapeyron equation. ln(P2/P1) = (Delta H/R)((1/T1)-(1/T2)). No matter how I use it I cant get the right answer. My previous answers: 84.933, -152.26, ???? i am not sure what I am doing wrong. Please help.

Answer 1

Should be around 309K (36C)

check to see that all units cancel and they are in the correct numerator or denominator

Most likely error is not using the correct R or not converting kJ to cal

calculated value will be 304.8