Question

What percentage of the mass of the isotope magnesium-24 do its neutrons contribute? proton = 1.0073...

What percentage of the mass of the isotope magnesium-24 do its neutrons contribute?

proton = 1.0073 amu
neutron = 1.0087 amu
electron = 5.4858×10-4 amu

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Answer #1

magnesium-24 = 12Mg24

no.of protons = 12 = 12 x 1.0073 = 12.0876

no.of neutrons = 12 x 1.0087 = 12.1044

total mass of Mg = 24.192 g

percentage of neutron mass = (12.1044 / 24.192 ) x 100

                                              = 50.03%

percentage of neutron mass = 50.03%

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