Which equation represents the average bond enthalpy of a C—H bond?

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

Which equation represents the average bond enthalpy of a C—H bond? (1) CH4(g)→C(s)+2H2(g)\text{CH}_4(\text{g}) \rightarrow \text{C}(\text{s}) + 2\text{H}_2(\text{g}) (2) CH4(g)→C(g)+4H(g)\text{CH}_4(\text{g}) \rightarrow \text{C}(\text{g}) + 4\text{H}(\text{g}) (3) 14CH4(g)→14C(g)+H(g)\frac{1}{4}\text{CH}_4(\text{g}) \rightarrow \frac{1}{4}\text{C}(\text{g}) + \text{H}(\text{g}) (4) 14CH4(g)→14C(s)+12H2(g)\frac{1}{4}\text{CH}_4(\text{g}) \rightarrow \frac{1}{4}\text{C}(\text{s}) + \frac{1}{2}\text{H}_2(\text{g})

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