Can i get help with physics
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Can i get help with physics

[From: ] [author: ] [Date: 11-06-10] [Hit: ]
008665 -0.= 7.......
a 7/3Li has a binding energy of -39.244603 MeV. The mass of a hydrogen atom is 1.007825 u and the mass of a neutron is 1.008665 u
1) What is the mass defect for this isotope?
2) what is the mass of this isotope?

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You don't say what units you want the answers to be in. I'll assume 'u'.

1) Mass defect = -Binding energy/c^2 (based on E=mc^2)
1u = 931.46 MeV/c2 (standard conversion factor)
Mass defect = 39.244603 / 931.46 = 0.042132 u

2) 7Li/3 could be constructed from 3 H-atoms + 4 neutrons
Mass = mass of components - mass defect
= 3x1.007825 + 4x1.008665 - 0.042132
= 7.016003 u
1
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