Final answer:
The heat gained when 450 grams of ice melts is approximately 150 kJ, calculated using the heat of fusion for water which is 334 J per gram.
Step-by-step explanation:
The student is asking how much heat is gained or lost when 450 grams of ice melts. According to the given reference, the heat of fusion of ice is 334 J per gram. To calculate the heat gained by the melting ice, we can use the formula Q = mLf, where Q is the heat transferred, m is the mass of the ice, and Lf is the latent heat of fusion. Since the latent heat of fusion for water is 334 kJ/kg, and we have 450 g (or 0.45 kg) of ice, we can calculate the heat (Q) as:
Q = (0.45 kg) × (334 kJ/kg) = 150.3 kJ.
Thus, the correct answer to the question is approximately 150 kJ, which can be rounded to the nearest option provided in the question, b) 150 kJ.