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Question 21M.2.SL.TZ1.3b.i

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Date May 2021 Marks available [Maximum mark: 2] Reference code 21M.2.SL.TZ1.3b.i
Level SL Paper 2 Time zone TZ1
Command term Estimate Question number b.i Adapted from N/A
b.i.
[Maximum mark: 2]
21M.2.SL.TZ1.3b.i

A mass of 1.0 kg of water is brought to its boiling point of 100 °C using an electric heater of power 1.6 kW.

A mass of 0.86 kg of water remains after it has boiled for 200 s.

(b.i)

Estimate the specific latent heat of vaporization of water. State an appropriate unit for your answer.

[2]

Markscheme

«mL = P t» so «L=1600×2000.14» = 2.3 x 106 «J kg-1» ✓

J kg−1 ✓

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