A calorimeter contains 500 g of water at 25°C. You place a hand warmer containing 100 g of liquid sodium acetate (NaAC) inside the calorimeter. When the sodium acetate finishes crystallizing, the temperature of the water inside the calorimeter is 32.2°C. The specific heat of water is

4.18 J/g-°C. What is the enthalpy of fusion (ΔHf) of the sodium acetate? Show your work.

Question

Elsa

Chemistry

11 February, 04:15

A calorimeter contains 500 g of water at 25°C. You place a hand warmer containing 100 g of liquid sodium acetate (NaAC) inside the calorimeter. When the sodium acetate finishes crystallizing, the temperature of the water inside the calorimeter is 32.2°C. The specific heat of water is

4.18 J/g-°C. What is the enthalpy of fusion (ΔHf) of the sodium acetate? Show your work.

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Answers (1)

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Puffy · Answer 1

The heat absorbed by the water is

Q = 500 (4.18) (32.2 - 25)

Q = 15048 J

The enthalpy of fusion of the sodium acetate is:

ΔHf = Q / m

ΔHf = 15048 / 100

ΔHf = 150.48 J/g