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A Level Chemistry

Thermochemistry and Energetics Questions and Answers

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Question 1 of 6thermochemistry / enthalpy

Dinitrogen pentoxide is formed by the sequence

I N2(g)+O2(g)→2NO(g)N_2(g) + O_2(g) \rightarrow 2NO(g) ΔH=+180 kJ mol−1\Delta H = +180\ kJ\,mol^{-1}
II NO(g)+12O2(g)→NO2(g)NO(g) + \frac{1}{2}O_2(g) \rightarrow NO_2(g) ΔH=−57 kJ mol−1\Delta H = -57\ kJ\,mol^{-1}
III 2NO2(g)+12O2(g)→N2O5(g)2NO_2(g) + \frac{1}{2}O_2(g) \rightarrow N_2O_5(g) ΔH=−55 kJ mol−1\Delta H = -55\ kJ\,mol^{-1}

The enthalpy change of formation of N2O5(g)N_2O_5(g), in kJ mol−1kJ\,mol^{-1}, is

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Organic ChemistryAtomic Structure and BondingChemical EquilibriumElectrochemistryReaction KineticsMole and Stoichiometry Calculations
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