Consider the following data: fH(methane, g) = –X kJ mol –1 Enthalpy of sublimation of graphite = Y kJ mol –1 Dissociation enthalpy of H2 = Z kJ mol –1 The bond enthalpy of C – H bond is given by: (A)

Question

Consider the following data: fH(methane, g) = –X kJ mol –1 Enthalpy of sublimation of graphite = Y kJ mol –1 Dissociation enthalpy of H2 = Z kJ mol –1 The bond enthalpy of C – H bond is given by:

(A) X Y 2Z
(B) X Y 4Z
(C) X + Y + Z
(D) X Y Z

Prashant Kotian · Accepted Answer

Correct answer: A. C(s) + 2H2(g)  CH4(g) –x = (Hsub of carbon) + 2 × (B.E. of H – H) –4 × (B.E. of C – H) –x = y + 2z – 4 (B.E. of C – H) B.E. of C – H = y 2z x   .

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