Hi, I posted this question earlier.. 100 g of water, H2O, is heated from 25C to 50C. What is the entropy change for

Question

the process?
Cp = 4.2J/K·mol for water?

I was told 100*4.2ln(323 K/ 298k) was the way to calculate it, it does not produce the correct answer.. I also tried to put water into moles.. 5.55 mole * 4.2 *ln(323/298). The correct answer choice is .34V. I just need to know how to get there. Thanks for your help.

Answer 1

Cp for water=4.179J/gK
entropy=100*4.178 * ln(323/298)
= 33.65J/K