Ethene can be oxidised to form epoxyethane, $$\(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}\)$$. $$\[ \mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}(\mathrm{g}) \quad \Delta H^{\ominus}=-107 \mathrm{~kJ} \mathrm{~mol}^{-1} \]$$ Which set of conditions gives the greatest yield of epoxyethane at equilibrium?

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