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Question 18M.2.sl.TZ2.4b.ii

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.2.sl.TZ2.4b.ii
Level sl Paper 2 Time zone TZ2
Command term Determine Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 1]
18M.2.sl.TZ2.4b.ii

Enthalpy changes depend on the number and type of bonds broken and formed.

The table lists the standard enthalpies of formation, Δ H f Θ , for some of the species in the reaction above.

M18/4/CHEMI/SP2/ENG/TZ2/04.b

(b.ii)

Determine the value of ΔHΘ, in kJ, for the reaction using the values in the table.

[1]

Markscheme

ΔHΘ « = ∑ Δ H f Θ (products) – ∑ Δ H f Θ (reactants) = –111 + 0 – [–74.0 + (–242)]»

= «+» 205 «kJ»

[1 mark]

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