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

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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:


q=m×ΔHfreezing


where:

m = mass (in g)

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


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