| Date | May 2018 | Marks available | 1 | Reference code | 18M.1.sl.TZ2.14 |
| Level | SL | Paper | 1 | Time zone | TZ2 |
| Command term | Derive | Question number | 14 | Adapted from | N/A |
Question
What is the enthalpy change of combustion of urea, (NH2)2CO, in kJ mol−1?
2(NH2)2CO(s) + 3O2(g) → 2CO2(g) + 2N2(g) + 4H2O(l)
A. 2 × (−333) −2 × (−394) −4 × (−286)
B. \(\frac{1}{2}\)[2 × (−394) + 4 × (−286) −2 × (−333)]
C. 2 × (−394) + 4 × (−286) −2 × (−333)
D. \(\frac{1}{2}\)[2 × (−333) −2 × (−394) −4 × (−286)]
Markscheme
B
Examiners report
[N/A]
Syllabus sections
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