The standard enthalpy of reaction Hr for the following reaction is A2+2B2=2AB2 Where bond dissociation enegiez are of A_ A, B_B and A_ B are 100 kj,150 kj and 50 kj respectively A.-200 kj B.200 kj C.100 kj D.600kj

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

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