DP Chemistry (last assessment 2024)
Question 18N.3.sl.TZ0.10c
| Date | November 2018 | Marks available | [Maximum mark: 2] | Reference code | 18N.3.sl.TZ0.10c |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Calculate | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
18N.3.sl.TZ0.10c
Coal can be converted to clean-burning synthetic natural gas.
(c)
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» = 50600 «g»/50.6 «kg» ✔
mcarbon dioxide «= » = 156 «kg» ✔
Award [2] for correct final answer.
