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Nitrogen occurs in nature in the form of...

Nitrogen occurs in nature in the form of two isotopes with atomic mass 14 and 15 respectively. If average atomic mass of nitrogen is 14.0067, what is the % abundance of the two isotopes ?

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In face centred cubic arrangement Lattice points located at the corners of th cube = 8
Lattice points located at the centre of each face = 6
Total number oflattice points = 8 + 6 = 14
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