Question 18
Change of State and Vapours1 kg of copper is transferred quickly from boiling water to a block of ice. Calculate the mass of ice melted, neglecting heat loss. [Specific heat capacity of copper − 400 J kg−1 K−1 and latent heat of fusion of ice − 333 × 103 J kg−1].
- A.60 g
- B.67 g
- C.120 g
- D.133 g
Show the answer and explanation
Answer: C (120 g)
Explanation
Heat given out by copper cooling from 100°C to 0°C = 1 × 400 × 100 = 40 000 J. Ice melted = 40 000/333 000 ≈ 0.12 kg = 120 g.