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April 30, 2016

# Homework Help: chemistry

Posted by Lost on Sunday, January 25, 2009 at 8:41pm.

Benzene has a heat of vaporization of 30.72kj/mol and a normal boiling point of 80.1 C . At what temperature does benzene boil when the external pressure is 410 ? This is how I am solving this problem,
ln(415/760)= (30720/8.314)*(1/80.1 - 1/T2)

It is asking to answer using two significant figures and it keeps telling me I'm incorrect. Any help would be appreciated.

Thanks.
• chemistry - Lost, Sunday, January 25, 2009 at 9:02pm

ops I meant to put 410 in the equation.

• chemistry - DrBob222, Sunday, January 25, 2009 at 9:04pm

Did you and I work on this problem yesterday. If not, then let me tell you quickly where your problem(s) is/are. First you MUST use Kelvin for T1. That is 80.1 + 273.16. I think the problem asks for T in C BUT you must solve the problem first, using Kelvin, then convert back to C. Second, I see you typed the problem as 410 but substituted 415. Take care that you are solving the problem with the right numbers.