Question

How much heat transfer (in kilocalories) is required to thaw a 0.450-kg package of frozen vegetables originally at 0ºC if their heat of fusion is the same as that of water?

a) 0.450 kcal
b) 1.00 kcal
c) 79.8 kcal
d) 334.4 kcal

Answer 1

To thaw the frozen vegetables, 334.4 kcal of heat transfer is required.

Step-by-step explanation:

To thaw a 0.450-kg package of frozen vegetables, we need to determine the heat transfer required. The heat transfer required to thaw a substance can be calculated using the formula:

Q = m * L

Where Q is the heat transfer, m is the mass of the substance, and L is the specific latent heat of fusion. Since the heat of fusion is the same as that of water, which is 334.4 kJ/kg, we can calculate the heat transfer:

Q = 0.450 kg * 334.4 kJ/kg = 150.48 kJ

In kilocalories, this is equivalent to:

150.48 kJ * (1 kcal/4.184 kJ) = 35.97 kcal

Therefore, the correct answer is d) 334.4 kcal.