🤓 Based on our data, we think this question is relevant for Professor de Laat's class at University of Guelph.
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:
m = mass (in g)
ΔHfreezing = heat of freezing (in J/g) *ΔHfreezing = – ΔHfusion
How much energy is released when 42.5 g of water freezes?