Ive tried these problem several times but cant get the answe

Ive tried these problem several times but cant get the answerright. I think im not using enough digits

I\'ll do the first one, then you can correct your answersaccordingly.

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For Pt 195, which has a mass of   194.964765

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mass of 79 hydrogen atoms = 79 *1.007825 =79.618175

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mass of   116 neutrons = 116*1.008665 = 117.00514

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total mass of separate nucleons:   196.623315

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mass difference = 196.623315 - 194.964765 = 1.65855

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  convert to energy = 1.65855 *931.494 = 1544.93 MeV

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divide by number of nucleons:   1544.93 / 195 =    7.923MeV per nucleon