Question

The heat of fusion of water is 80 cal/ g. How much energy is needed to melt 0.05 kg of ice?

Answer 1

80 cal/ g is same as 80 calories in each 1 gram. so,

80 cal= 1 gram

first, we need to convert the kg into grams. all you have to do is multiply by 1000 or move the decimal three times to the right. 

0.05 kg= 50.0 grams

50.0 g (80 cal/ 1 gram)= 4000 calories