# Homework Help: When heat becomes confusing

1. Sep 26, 2010

### Kyoma

1. The problem statement, all variables and given/known data

Question 1: Hot water at 100 degrees is added to 5 g of ice at 0 degrees. What is the minimum mass of hot water needed to melt all the ice? (Specific latent heat of fusion of ice = 336Jg-1, specific heat capacity of water is 4.2Jg-1K-1)

2. The attempt at a solution

Question 1:
mc$$\Delta$$$$\theta$$ = m(latent fusion)
m$$\Delta\theta$$ = 400
And then I have a doubt: How can the hot water's temperature decrease from 100 degrees to 0 degrees? ($$\Delta\theta$$ = 100 - 0)

2. Sep 26, 2010

### Onamor

what does this mean?

3. Sep 28, 2010

### Kyoma

Change in temperature.

4. Sep 28, 2010