Common Mistakes on HW7

On problem 32, some people didn't look up the correct Tn to plug into the equations 4.12 and 4.13.
Overall, make sure that you are computing the integrals for Cp correctly. It seemed there a lot of people that had the right set up, but did not get the correct answer.
On 33, some people ignored the fact that there were 3 different deltaH's that needed to be calculated (heating the liquid to 368, delta H of vaporization, and heating the gas from 368 to 500).

On 35, make sure all your signs are correct - the heat is being removed from the system (so Q is negative).

On 36, you only needed to concern yourself with the amount that was reacted. While it was technically correct to cool the steam and non-reacting species to 298 and then heat them up again, you should realize that if they do not react, these actions will cancel each other out (since it was isothermal). So you only need to compute all the deltaH's for the .33 moles of butene that reacts (for a 1 mole basis feed).

-Matt