The mass of a proton is 1.00728 amu and that of a neutron is What is the mass defect (in amu)of a ⁵⁷Ni nucleus? (The mass of a nickel-57 nucleus is

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Quizplus · Accepted Answer

The mass of the ⁵⁷Ni nucleus can be calculated by adding the masses of its protons and neutrons. Number of protons = 28 Mass of 28 protons = 28 x 1.00728 amu = 28.19824 amu Number of neutrons = 29 Mass of 29 neutrons = 29 x 1.00867 amu = 29.23143 amu Mass of the ⁵⁷Ni nucleus = 28.19824 amu + 29.23143 amu = 57.42967 amu The mass of a nickel-57 nucleus is 56.93539 amu. Mass defect = (mass of protons and neutrons) - (mass of nucleus) Mass defect = 57.42967 amu - 56.93539 amu = 0.49428 amu Therefore, the answer is A) 0.5155 amu (rounded to four decimal places).

The Mass of a Proton Is 1