DP Chemistry (last assessment 2024)
Question 21N.2.hl.TZ0.1a
Date | November 2021 | Marks available | [Maximum mark: 3] | Reference code | 21N.2.hl.TZ0.1a |
Level | hl | Paper | 2 | Time zone | TZ0 |
Command term | Determine | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 3]
21N.2.hl.TZ0.1a
A 4.406 g sample of a compound containing only C, H and O was burnt in excess oxygen. 8.802 g of CO2 and 3.604 g of H2O were produced.
(a)
Determine the empirical formula of the compound using section 6 of the data booklet.
[3]
Markscheme
«» 0.2000 «mol of C/CO2»
AND «» 0.2000 «mol of H2O»/0.4000 «mol of H»
OR
«» 2.402 «g of C»
OR
«» 0.404 «g of H» ✔
«4.406 g − 2.806 g» = 1.600 «g of O» ✔
«»
C2H4O ✔
Award [3] for correct final answer.

