- #1

- 4

- 0

## Homework Statement

A 500 g copper block at 80 C is dropped into 1.0 kg of water at 10 C. Find the entropy change of the system.

## Homework Equations

dS= integral of dQ/T

## The Attempt at a Solution

I found that the final equilibrium temperature is 290 K using the equation

[(m1*c1*dT1) + (m2*c2*dT2)]/ [(m1*c1) + (m2*c2)]

I know that this is correct, but I'm not sure what to do from here. I know that this is Tf, but what do I use as Ti for the integral, the temperature of the block or the water? And which equation do I integrate to find the entropy in this case (What is the equation for Q)?