O-LevelChemistryStoichiometry5070/11 · Oct/Nov 2013 · Q121 Mark

Nitrogen and oxygen react according to the equation. N2(g) + 2O2(g) → 2NO2(g) The enthalpy change for the reaction shown is +66 kJ. If two moles of nitrogen and two moles of oxygen are used, what will be the enthalpy change?

A+16.5kJ

B+33 kJ

C+66 kJ

D+132kJ

✓ Correct answer

C: +66 kJ

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2013 Paper 1 Variant 1, question 12.

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