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**1. Homework Statement**

In an experiment, 240 g of aluminum (with a specific heat of 900 J/kgK) at 100°C is mixed with 40.0 g of water (4186 J/kgK) at 20°C, with the mixture thermally isolated.

a: What is the equilibrium temp in C?

b: What is the entropy change of aluminum?

c: What is the entropy change of the water?

d: What is the entropy change of the aluminum-water system?

**2. Homework Equations**

Q=mC(Tf - Ti)

MwCw(Tf - 20c) + MaCa(Tf - 100c)= 0

S(entropy)= Q/T

**3. The Attempt at a Solution**

Basically I'm kinda stuff trying to solve for the final temp, I get 11.9C but that cannot be right since that means the water-Al system lost heat. :grumpy:

any help is very welcome