Equations (1) and (2) can be combined to yield the equation for the formation of CH₄(g) from its elements.

Use the preceding data and a bond energy of 436 kJ mol^-1 for H₂ to estimate the C—H bond energy. Compare your result with the value listed in Table 10.3.

Table 10.3

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C(s) C(g) (1) (2) C(g) + 2 H₂(g) →→→→ CH4(g) Overall: C(s) + 2 H2(g) → CH4(g) 1 A,H = 717 kJ mol-¹ AH = ? AƒH° = -75 kJ mol-¹