Mass number of reactant = 240 BE per nucleon = 7.6 MeV Mass number of products = 120 BE per nucleon of product = 8.5 MeV Total gain in BE = (BE) of products – (BE) of reactants. = [120 + 120] × 8.5 – [240] × 7.6 = (240) × 8.5 – 240 × 7.6 = (2040 – 1824) MeV Gain in BE = 216 MeV