Question

It takes 15 minutes to raise a certain amount of water 0⁰C to boiling point using an electric heater. After this one hour and twenty minutes are required in the same conditions to convert all the water into vapour –

• A. Latent heat of vaporization is 530 cal
• B. Latent heat of vaporization is 533 cal
• C. Mass of water is 1 kg
• D. Latent heat of vaporization is 540 cal**.**

Answer 1

Answer: (B)

Latent heat of vaporization is 533 cal

Answer 2

L = $\frac{t_{2}}{t_{1}} \times 100$