How much heat is necessary to change 20 g of water at 100°C into steam at 100°C?
A) 0.16 kcal
B) 10800 kcal
C) 10.8 kcal
D) 1.6 kcal

Question

Quizplus · Accepted Answer

The amount of heat necessary to change water at its boiling point into steam without changing its temperature is calculated using the latent heat of vaporization of water, which is approximately 540 calories per gram. Therefore, for 20 grams of water, the heat required is 20 g * 540 cal/g = 10800 calories, or 10.8 kcal.

How Much Heat Is Necessary to Change 20 G of Water