DP Chemistry (last assessment 2024)

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Question 17N.2.hl.TZ0.2d.i

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

Menthol is an organic compound containing carbon, hydrogen and oxygen.

(d.i)

Complete combustion of 0.1595 g of menthol produces 0.4490 g of carbon dioxide and 0.1840 g of water. Determine the empirical formula of the compound showing your working.

[3]

Markscheme

carbon: « 0.4490 g 44.01 g mo l − 1 =» 0.01020 «mol» / 0.1225 «g»
OR
hydrogen: « 0.1840 × 2 18.02 g m o l − 1 =» 0.02042 «mol» / 0.0206 «g»

oxygen: «0.1595 – (0.1225 + 0.0206)» = 0.0164 «g» / 0.001025 «mol»

empirical formula: C10H20O

Award [3] for correct final answer.

Do not award M3 for a hydrocarbon.

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