Homework Question 9.15 (a)

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Homework Question 9.15 (a)

Postby Michelle_Li_1H » Wed Jan 25, 2017 1:18 pm

Question: Use data in Table 8.3 or Appendix 2A to calculate the entropy change for (a) the freezing of 1.00 mol H2O(l) at 0.00 C

I was wondering how I should approach this. Thanks in advance!

Mikaela Gareeb 3G
Posts: 31
Joined: Wed Sep 21, 2016 3:00 pm

Re: Homework Question 9.15 (a)

Postby Mikaela Gareeb 3G » Wed Jan 25, 2017 1:48 pm

DeltaS=q/T = DeltaH/T = ((1.00 mol)(-6.01 kJ/mol))/(273.2 K).
-6.01 kJ/mol is the enthalpy of fusion (melting), and since freezing is the opposite of melting you just take the negative of delta H. Also, the freezing point of water is at 273.2 K- both of these values are found in table 8.3.

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