Lead is a soft, dense metal with a specific heat of 0.028 kcal/kgCO,?

Question

Lead is a soft, dense metal with a specific heat of 0.028 kcal/kgCO, a melting point of 328.0°C, and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature of 20.0oC?

Answer 1

250kg of lead at 20.0°C must be heated to melting point of 328.0°C and melt fully.

The rise in temperature = 308°C

Heat required to rise
= 250kg x 308°C x 0.028 kcal/kg/°C
= 2 156 kcal

Heat required to melt fully
= 250kg x 5.5 kcal/kg
= 1 375 kcal

Total heat required
= 2156 kcal + 1375 kcal
= 3 531 kcal