We have the thermodynamic relationship:
lnK = - 'delta'H/RT + 'Delta'S/R
which yields: ln Kf/Ki = delta H/R [Tf - Ti]/[Tf.Ti]
or delta H = Rln Kf/Ki x [Tf.Ti]/[Tf - Ti]
= 8.314 ln 2 x [308x298]/[308-298] Joules
= 52.894 KJ
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