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Question 18N.3.hl.TZ0.c

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.hl.TZ0.c
Level hl Paper 3 Time zone TZ0
Command term Calculate Question number c Adapted from N/A
c.
[Maximum mark: 2]
18N.3.hl.TZ0.c

Coal can be converted to clean-burning synthetic natural gas.

Calculate the mass, in kg, of carbon dioxide produced by the complete combustion of 72.0 dm3 octane, C8H18.

Density of C8H18 = 703 g dm−3

C8H18 (l) + 12.5O2 (g) → 8CO2 (g) + 9H2O (g)

[2]

Markscheme

moctane «= 72.0 dm3 × 703 g dm–3» = 5.06 × 104 «g»/50.6 «kg» ✔

mcarbon dioxide «= 8 × 44.01 114.26 × 50.6 » = 156 «kg» ✔

 

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