Question

Heat from the Sun melts 1.6 kg of ice in 40 minutes.

The minimum heat energy required to change 1.6 kg of ice at 0 °C into water at 0 °C is:

1. 6.7 ${\times}$ 10³ J
2. 1.3 ${\times}$ 10⁴ J
3. 2.1 ${\times}$ 10⁵ J
4. 5.3 ${\times}$ 10⁵ J
5. 3.6 ${\times}$ 10⁶ J.

1 mark