Question

calculate the heat energy required to change 5 grams of ice at minus 5 degree Celsius into water at 20 degree Celsius​

Answer 1

Heat required to change -5°C ice to 20°C is 525 cal

Explanation:

We have given mass of ice m = 5 gram

We have to find heat energy required to change -5°C ice to 20°C

Firstly we have to calculate -5°C ice to 0°C ice

Specific heat of water 1 cal/gram°C

So heat required to change 5°C ice to 0°C ice

$Q=mc\Delta T=5\times 1\times 5=25cal$

Now heat required to change 0°C ice  to 0°C water

$Q=mL=5\times 80=400cal$

Now heat required to change water from 0°C to 20°C

$Q=mc\Delta T=5\times 1\times 20=100cal$

So heat required to change -5°C ice to 20°C = 25+400+100 = 525 cal

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