Question

How much heat (Joules) is released when 5.0 g of water vapor condenses to a liquid at 100 Celsius

Answer 1

Steam latent heat (amount of heat steam gives out when converting into water) is 540 kCal/kg at 100 Celsius.

Therefore, heat given out by 5 g of steam is:

540/1000 x 5=2.7 kCal

1 kCal = 4.184 kJ

2.7 x 4.184 = 11.3 kJ