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Question 18M.2.hl.TZ1.3c.v

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Date May 2018 Marks available [Maximum mark: 3] Reference code 18M.2.hl.TZ1.3c.v
Level hl Paper 2 Time zone TZ1
Command term Determine, Show Question number c.v Adapted from N/A
c.v.
[Maximum mark: 3]
18M.2.hl.TZ1.3c.v

This question is about ethene, C2H4, and ethyne, C2H2.

(c.v)

Determine, showing your working, the spontaneity of the reaction in (ii) at 25 °C.

[3]

Markscheme

T = «25 + 273 =» 298 «K»

ΔGϴ «= –635 kJ – 298 K × (–0.430 kJ K–1)» = –507 kJ

ΔGϴ < 0 AND spontaneous

 

ΔGϴ < 0 may be inferred from the calculation.

[3 marks]

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