DP Chemistry (last assessment 2024)
Question 23M.2.SL.TZ2.1a
| Date | May 2023 | Marks available | [Maximum mark: 3] | Reference code | 23M.2.SL.TZ2.1a |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Determine | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 3]
23M.2.SL.TZ2.1a
(a)
An unknown organic compound, X, comprising of only carbon, hydrogen and oxygen was found to contain 48.6 % of carbon and 43.2 % of oxygen.
Determine the empirical formula.
[3]
Markscheme
«n(C) =» 4.05 «mol»
AND
«n(O) =» 2.70 «mol» ✓
«% H =» 8.2 %
OR
«n(H) =» 8.12 «mol» ✓
«empirical formula =» C3H6O2 ✓
Award [2] for the simplest ratio ″1.5 C: 3 H: 1 O″.
