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Date November 2010 Marks available 1 Reference code 10N.1.hl.TZ0.16
Level HL Paper 1 Time zone TZ0
Command term Question number 16 Adapted from N/A

Question

Given the enthalpy change for the reaction below:

\[\begin{array}{*{20}{l}} {{\text{2}}{{\text{H}}_{\text{2}}}{\text{(g)}} + {{\text{O}}_{\text{2}}}{\text{(g)}} \to {\text{2}}{{\text{H}}_{\text{2}}}{\text{O(l)}}}&{\Delta {H^\Theta } =  - 572{\text{ kJ}}} \end{array}\]

which statement is correct?

A.     The standard enthalpy change of combustion of \({{\text{H}}_2}{\text{(g)}}\) is \( - 286{\text{ kJ}}\,{\text{mo}}{{\text{l}}^{ - 1}}\).

B.     The standard enthalpy change of combustion of \({{\text{H}}_2}{\text{(g)}}\) is \( + 286{\text{ kJ}}\,{\text{mo}}{{\text{l}}^{ - 1}}\).

C.     The standard enthalpy change of formation of \({{\text{H}}_2}{\text{O(l)}}\) is \( - 572{\text{ kJ}}\,{\text{mo}}{{\text{l}}^{ - 1}}\).

D.     The standard enthalpy change of formation of \({{\text{H}}_2}{\text{O(l)}}\) is \( + 572{\text{ kJ}}\,{\text{mo}}{{\text{l}}^{ - 1}}\).

Markscheme

A

Examiners report

[N/A]

Syllabus sections

Core » Topic 5: Energetics/thermochemistry » 5.2 Hess’s Law
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