I've tried this question numerous times and Sapling keeps saying its incorrect... can someone please explain what I did wrong? and how to work the problem correctly? thank you!

Use the Clausius-Clapeyron equation

ln(p1/p2)=Hvap/8.3145 (1/T1-1/T2)

where R=8.3145 J/(mol·K).

## Comments

It's also possible that Kayla's book had a negative sign in the equation (some do).