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The atomic mass of .(8)O^(16) = 15.9949 ...

The atomic mass of `._(8)O^(16) = 15.9949` amu. Calculate the `BE//"nucleon"` for this atom. Mass `1n` and `1p` is 2.016490 amu and `m_(e) = 0.00055` amu.

Text Solution

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Mass of `1n + 1p = 2.016490 "amu"`
`:.` Mass of `8n + 8p xx (2.016490 ) "amu"`
`:.` Total mass of `O^(16)` atom `= m (p + n) + m` (electron)
`= 8 xx (2.016490) + 0.00055 xx 8`
`= 16.13632 "amu"`
`:.` Mass defect `= 16.1363 - 15.9949 = 0.1414 "amu"`
`:.` Building energy `(BE)` = Mass defect `xx 921.478 MeV`
`= 0.1414 xx 931.478`
`= 131.71 MeV`
`Be//"nucleon" = ("Total BE")/("Number of nucleons") (131.71)/(16)`
`=8.232 MeV`
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