DP Chemistry (last assessment 2024)

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Question 17N.3.sl.TZ0.a

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.3.sl.TZ0.a
Level sl Paper 3 Time zone TZ0
Command term Calculate Question number a Adapted from N/A
a.
[Maximum mark: 2]
17N.3.sl.TZ0.a

One method of comparing fuels is by considering their specific energies.

Calculate the specific energy of octane, C8H18, in kJ kg–1 using sections 1, 6 and 13 of the data booklet.

[2]

Markscheme

Mr (C8H18) = 114.26 AND ΔH c θ = –5470 «kJ mol–1»

«specific energy = 5470 kJ 0.11426 kg =» 4.79 x 104/47873/47900 «kJ kg–1»

Award [2] for correct final answer.

Accept “48 x 103 «kJ kg–1»” OR “47.9 x 103 «kJ kg–1»”.

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