Question

80 gm of water at 30°C are poured on a large block of ice at 0°C. The mass of ice that melts is

• A. 30 gm
• B. 80 gm
• C. 1600 gm
• D. 150 gm

Answer 1

Answer: (A)

30 gm

Answer 2

If m gm ice melts then

Heat lost = Heat gain

$80 \times 1 \times (30 - 0) = m \times 80$ ⇒ $m = 30gm$