Ice has a latent heat of fusion of 80kcal/kg. How much heat is reuquired to melt

Question

Ice has a latent heat of fusion of 80kcal/kg. How much heat is reuquired to melt 200g of ice?


An aluminum kettle(100g) of pure water (60g) is at room temperature(20 degrees C). the kettle and its contents are placed on a 1000 watt electric burner and heated to boiling. assuming that all the heat from the burner heats the kettle and its contents and that a negligible amount of water evaporates before boiling begins, calculate the amount of time requiered to bring the water to boil?


ice cream was eaten gibes about 2100 calories/kg to the body. on the other ahnd, the body must give back energy to warm it upto body temperature (37C) assuming ice cream has similar thermal properties to water,
a) 1/2 kg produces how much energy?
b)1/2 kg absorbs how much energy to reach 37C
c0 what is the net gain or loss (eating 1/2 kg of ice cream)?

Explanation / Answer

a) Q = mL = 0.2 x 80 = 16 kcal

b)

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