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Question 18M.2.HL.TZ2.2a.iii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.HL.TZ2.2a.iii
Level HL Paper 2 Time zone TZ2
Command term Calculate Question number a.iii Adapted from N/A
a.iii.
[Maximum mark: 2]
18M.2.HL.TZ2.2a.iii

An ideal monatomic gas is kept in a container of volume 2.1 × 10–4 m3, temperature 310 K and pressure 5.3 × 105 Pa.

(a.iii)

Calculate, in J, the internal energy of the gas.

[2]

Markscheme

«For one atom U =  3 2 kT»  3 2  × 1.38 × 10–23 × 310 / 6.4 × 10–21 «J»

U = «2.6 × 1022 ×  3 2  × 1.38 × 10–23 × 310» 170 «J»

 

 Allow ECF from (a)(ii)

Award [2] for a bald correct answer

Allow use of U = 3 2 pV

[2 marks]

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