Question
How much heat is to be supplied to raise the temperature of 100 g of water from 20°C to the normal boiling point of water? [Ans. 8000 cal]
Answer
To calculate the heat required to raise the temperature of 100 g of water from 20°C to the normal boiling point (100°C), we can use the formula:
Heat = Mass × Specific heat × Temperature change
Given:
Mass of water (m) = 100 g
Specific heat of water (s) = 1 cal/g/°C
Temperature change (ΔT) = (100°C – 20°C) = 80°C
Heat = 100 × 1 × 80
Heat = 8000 cal
Therefore, the amount of heat that needs to be supplied to raise the temperature of 100 g of water from 20°C to the normal boiling point is 8000 cal.
