1. Gaseous ammonia is burned with O2 in a container of fixed volume according to the following equation: 4NH3(g) + 3O2(g

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1. Gaseous ammonia is burned with O2 in a container of fixed
volume according to the following equation:
4NH3(g) + 3O2(g)  2N2(g) + 6H2O(l)
Calculate the enthalpy change per mole of O2. Show working. (2
marks)
ΔfH°(NH3(g)) = −46.11 kJ mol−1; ΔfH°(H2O(l)) = −285.83 kJ
mol−1
2. The rate constant for a reaction is 5.0 × 10–3 s–1 at
215 oC and 1.2 × 10–1 s–1 at
452 oC.
What is the activation energy of the reaction in kJ mol–1. (2
marks)
3. What is the rate constant for this reaction at 100 oC?
(2 marks)