Question

Calculate the heat in calories needed to freeze 55 g of water at 0 degrees * C . Express your answer to two significant figures and include the appropriate units.

Answer 1

The heat needed to freeze the water is 4400 calories

From the question given above, the following data were obtained:

Mass of water (m) = 55 g

Heat (Q) =?

NOTE:

Enthalpy of fusion of water (ΔHբ) = 79.7 cal/g

The heat needed to freeze the water can be obtained as illustrated below:

Q = m•ΔHբ

Q = 55 × 79.7

Q = 4383.5 calories

Q = 4400 calories ( 2 sf)

Therefore, the heat needed to freeze the water is 4400 calories

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