# How many joules of heat are needed to change 50.0 grams of ice at -15.0 °C to steam at 120.0 °C?

##### 1 Answer

The answer is

What you are asked to determine is the total energy required to go from ice to water, and then from water to vapor - the phase changes underwent by the water molecules.

In order to do this, you'll need to know:

**Heat of fusion of water**:

**Heat of fusion vaporization of water**:

**Specific heat of ice**:

**Specific heat of water**:

**Specific heat of steam**:

So, the following steps describe the overall process:

**1.** Determine the heat required to raise the temperature of the ice from

**2**. Determine the heat required to convert

**3**. Determine the heat required to go from water at

**4**. Determine the heat required to convert

**5**. Determine the heat required to go from

Therefore, the total heat required is