5. (3 pts) On the simple heating diagram, label the following: A: where the \"ic

Question

5. (3 pts) On the simple heating diagram, label the following: A: where the "ice" starts if it is wet, B: where the ice starts if it is below o°c C: where the ice starts if it is dry at 0°C, D: where the water starts (approximately), E: where everything finishes, approximately. (3 pts) Sample calculation: You add 5 g of ice to 100 g of water. The initial temperature of the water is 23 °C. The minimum temperature of the water is 19 °C. Based on this data, you should find that the enthalpy of fusion of water is 255 J/g. Do the calculation, showing your work clearly, and make sure that your answer is 255 J/g. 6. 91

Explanation / Answer

Q = mc?T

Q = heat energy (Joules, J), m = mass of a substance (kg)

c = specific heat (units J/kg?K), ? is a symbol meaning "the change in"

?T = change in temperature (Kelvins, K)

specific heat capacity for solid water (ice) = 2.06 J g¯1 K¯1
specific heat capacity for liquid water = 4.184 J g¯1 K¯1

heat gained by ice =  Heat lost from water

5. x Enthalpy of ice + 5 x 4.184 x 19 = 100 x 4.184 x (23-19)

5. x Enthalpy of ice = 1673.6 - 397.48

  Enthalpy of ice = 1276.12 / 5

Enthalpy of ice = 255.22 ~ 255 Joules / gram

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