Heat of Fusion of Ice and Heat of Vaporization of Water 1. (1 pt) Why do you nee

Question

Heat of Fusion of Ice and Heat of Vaporization of Water

1. (1 pt) Why do you need to be careful to dry the ice before adding it to the water in Part B?

2. (2 pts) How much energy is needed to melt 35g of ice at 0 ºC to turn it into water at 0 ºC? (Show your calculations)

3. (2 pts) How much energy is needed to increase the temperature of 35g of water from 0 ºC to 20 ºC? (Show your calculations)

4. (1 pt) What is the mass of water at 40 ºC that would need to be cooled to 20 ºC in order to provide enough energy for questions 2 and 3 combined? (Show your calculation)

Explanation / Answer

(1) Incomplete question Part B is not mentioned!!

(2)
Energy Needed, Q = mi * Li
Q = 35 * 333.55 J
Q = 11674.25 J

(3)
Energy Needed, Q = mw * Cw * T
Energy Needed, Q = 35 * 4.186 * 20 J
Energy Needed, Q = 2930.2 J

(4)
Total Energy needed, = 11674.25 + 2930.2 = 14604.45 J
Let mass of water needed, = mw

mw * Cw * T = 14604.45
mw * 4.186 * 20 = 14604.45
mw = 174.4 gm

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