Question

Find the mass of liquid water required to absorb 4.81×104 kJ of heat energy on boiling.
Answer in units of g.

Answer 1

What is the initial temperature of the water? If we assume the water is at the boiling point (100 C), look up the heat of vaporization.
q = mass H2O x heat vaporization
Look up the density of water @ 100 C, and convert mass to volume by
mass = volume x density
Post your work if you get stuck.