Amount of heat required to the t change temperature of a substance:

$\overline{){\mathbf{Q}}{\mathbf{=}}{\mathbf{m}}{\mathbf{C}}{\mathbf{\u2206}}{\mathbf{T}}}$

**A.**

T_{f} = 0 °C + 273 = 273 K

T_{i} = -15.0 °C + 273 = 258 K

C = 2040J/kg•K

Suppose that in an insulated container, 0.100 kg of water at 20.0 °C is mixed with 1.500 kg of ice at −15.0 °C. You are asked to find the final temperature T_{f} of the system, but you are not told what the final phase of the system in equilibrium is.

A. Find the amount of heat *Q*_{h} it would take to bring all of the ice to its melting point, 0 °C. Express your answer in joules to three significant figures.

B. Find the amount of heat *Q*_{c} released in bringing all of the water to its freezing point, 0 °C. Your answer does not need to include a sign. Express your answer in joules to three significant figures.

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