The heat required to raise the temperature of 12g of water from 16 C to 21 C is: a) 60 J
b) 60 cal
c) 50 cal
d) 50 J

The correct option is;

b) 60 cal

Explanation:

The mass of the given water, m = 12 g

The initial temperature of he given water = 16°C

The final temperature of the given water = 21°C

The specific heat capacity of water, c = 4.184 J/(g·°C) = 1 cal/(g·°C)

The amount of heat, ΔQ, required = Mass × Specific heat capacity × Change in temperature

ΔQ = 12 × 4.184 × (21 - 16) = 251.04 J

Similarly, we have;

ΔQ = 12 g × 1 cal/(g·°C) × (21 - 16)°C = 60 cal

The amount of heat required = 60 cal.