# Problem: How much energy is released when 42.5 g of water freezes?

🤓 Based on our data, we think this question is relevant for Professor de Laat's class at University of Guelph.

###### FREE Expert Solution

We’re being asked to calculate the amount of energy released by freezing 42.5 g of water.

Recall that during a phase transition, the temperature is constant

Also note that freezing is an exothermic process, which means q is negative (–).

The amount of energy (q) needed to freeze a given mass is calculated using:

$\overline{){\mathbf{q}}{\mathbf{=}}{\mathbf{m}}{\mathbf{×}}{{\mathbf{\Delta H}}}_{{\mathbf{freezing}}}}$

where:

m = mass (in g)

ΔHfreezing = heat of freezing (in J/g)     *ΔHfreezing = – ΔHfusion

###### Problem Details

How much energy is released when 42.5 g of water freezes?