# Phase Change Problems

lolphysics3

## Homework Statement

I have three questions I need help on. Can someone please explain to me how to do them, how to correctly set up the problem, and what I need to know. I have a test tomorrow. Thanks!

Q1: How much heat is released freezing 75 grams of steam at 110 degrees C into ice at -5.1 degrees C

Q2: How much heat is released in condensing 43 grams of steam at 100 degrees C and then cooling the water to 20 degrees C.

Q3: I make a cup of tea with 43 g of water at 99 degrees C. To cool it, I add 5.1g of ice at 0 degrees C. By how much will the temperature of the tea come down by once I add the ice? (Treat tea the same as regular water)

## Homework Equations

Change in Heat= mass*specific heat*change in temperature
Change in Heat=mass*latent heat

## The Attempt at a Solution

$$\Delta Heat = m (Cp) ( \Delta Temp)$$