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Question 19N.2.SL.TZ0.2a

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.SL.TZ0.2a
Level SL Paper 2 Time zone TZ0
Command term Calculate Question number a Adapted from N/A
a.
[Maximum mark: 2]
19N.2.SL.TZ0.2a

The air in a kitchen has pressure 1.0 × 105 Pa and temperature 22°C. A refrigerator of internal volume 0.36 m3 is installed in the kitchen.

(a)

With the door open the air in the refrigerator is initially at the same temperature and pressure as the air in the kitchen. Calculate the number of molecules of air in the refrigerator.

[2]

Markscheme

N=pVkT OR N=1.0×105×0.361.38×10-23×295 ✔

N=8.8×1024 ✔

NOTE: Allow [1 max] for substitution with T in Celsius.
Allow [1 max] for a final answer of n = 14.7 or 15
Award [2] for bald correct answer.

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