How is enthalpy of formation related to the stability of a substance? Which of the two isomers of butane is more stable at 298 k ? [given: arho (n-butane) = - 120 kj mol ! And l\-ho(isobutane) = - 129.8 kj mor'] (b) calculate the bondenthalpy ofn-h bond in nh 3 (g)" given: ~ n2(g) + ~ h2(g) ~ nh3(g); ~ilo =- 46 kj mol:' 1 "2~~heg~ a1io = 218 kj mol! 1 "2 n2(g) ~ n(g~ a1io = 973 kj mol!
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