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

water-freeze

#1

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

Concepts and reason
Enthalpy of freezing (image) is used to calculate energy needed to release when liquid becomes solid (freeze).

Fundamentals
Heat energy equation:
image
Where
Heat is q.
Number of moles involved is n.
Enthalpy of freezing is image.

Answer:

image

Explanation:
In this question, given mass of water is 42.5 g which is converted into moles of water to calculate heat by using molar mass of water, 18.0 g/mol.

image

image

Explanation:
Heat energy released when water freezing is calculated by substituting the values of moles of water and enthalpy of freezing into the heat energy equation as in kJ.