struggling.... please help!

Question

How much heat is needed to boil 5.30 kg of water at its boiling point?
Use Q = mass latent heat of vaporization.
Properties of water

Property Value
Melting point 0C
Boiling point 100C
cliquid 4.18 kJ/(kg C)
Latent heat of fusion 333 kJ/kg
Latent heat of vaporization 2260 kJ/kg

A. 1760 kJ

B. 530 kJ

C. 22.2 kJ

D. 12,000 kJ

Answer 1

The question is really asking how much energy is required to convert water from its liquid phase to vapor phase.  

heat of vaporization * mass of water

 

2260 kJ/kg * 5.30 kg = 11,978 kJ