What Causes the Mass Defect in a 15N Nucleus?

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SUMMARY

The mass defect of the 15N nucleus is calculated by subtracting the mass of its constituent nucleons from the actual mass of the nucleus. The correct calculation involves using the mass of 15N, which is 15.000109 u, rather than the mass of 14N (14.003074 u). The mass defect is determined using the formula: mass defect = (mass of protons + mass of neutrons) - mass of nucleus. The accurate mass defect for the 15N nucleus is approximately 1.120161 u.

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pveclipse96
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What is the mass defect of the 15N nucleus?

My attempt:

15-7=8
7(1.008665)+8(1.0078225)-14.003074
=1.120161

the answer needs to be in u so i don't know if this makes a difference or not but for some reason it is not working
 
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Why are you using the number 14.003074? That's the mass of 14N. The mass defect is the real mass (of 15N) minus the mass of the constituent neutrons and protons.
 
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