DP Chemistry (last assessment 2024)

Question 18M.2.hl.TZ1.1d.i

Date	May 2018	Marks available	[Maximum mark: 1]	Reference code	18M.2.hl.TZ1.1d.i
Level	hl	Paper	2	Time zone	TZ1
Command term	State	Question number	d.i	Adapted from	N/A

d.i.

[Maximum mark: 1]

18M.2.hl.TZ1.1d.i

Urea, (H₂N)₂CO, is excreted by mammals and can be used as a fertilizer.

Urea can also be made by the direct combination of ammonia and carbon dioxide gases.

2NH₃(g) + CO₂(g) $\rightleftharpoons$ (H₂N)₂CO(g) + H₂O(g) ΔH < 0

(d.i)

State the equilibrium constant expression, K_c.

[1]

Markscheme

${K_{\text{c}}} = \frac{{[{{({{\text{H}}_2}{\text{N}})}_2}{\text{CO}}] \times [{{\text{H}}_2}{\text{O}}]}}{{{{[{\text{N}}{{\text{H}}_3}]}^2} \times [{\text{C}}{{\text{O}}_2}]}}$

[1 mark]

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Core » Topic 7: Equilibrium » 7.1 Equilibrium

Core » Topic 7: Equilibrium

Question 18M.2.hl.TZ1.1d.i

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