### Homework Question: 8.49

Posted:

**Sat Jan 21, 2017 8:58 pm**For question 49 in the homework we have to use the equation deltaU=deltaH-PdeltaV to solve for the internal energy. I found H and PV (using the ideal gas equation) and I subtracted them but since PdeltaV was a negative value I ended up getting -318-(-2.47)=-315.53; however, the book got -318-2.47=-320. Did I make a math error, or misplace a negative sign? Or did the book make a mistake? Which answer would be correct? Thank you!