Question

To make tea, a tourist puts into a kettle $2$ kg of ice at a temperature of $0^o$C. How much heat would be needed if the tourist had taken $2$ kg of water from an ice hole, instead of ice at $0^o$C?

Answer 1

Mass of Water = $2000g$
If he had water,

Required heat = $ms\Delta T$ =$2000\times 1\times (100-0)=200000calories$

If he had ice,
Required Heat = Heat to melt Ice$\left(mL\right)$ + Heat to raise temperature from $0^{o}C$ to ${100}^{o}C$ ($ms\Delta T$)

Required heat $=(2000\times 80)+(2000\times 1\times (100-0\left)\right)=160000+200000=360000calories$