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The methane molecule, CH4, has the geometry shown in
Figure 2.17. Imagine a hypothetical process in which the
methane molecule is “expanded,” by simultaneously extending
all four C—H bonds to infinity. We then have the
CH41g2¡C1g2 + 4 H1g2
(a) Compare this process with the reverse of the reaction
that represents the standard enthalpy of formation of