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Question

If (N,P,As) was Dobereiner's triads then what would be the absolute error in atomic mass of phosphorous as compared to the original mass?
Atomic mass : Nitrogen =14 amu, Arsenic =74.9 amu, Phosphorous =31 amu

A
13.45
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B
12.45
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C
15.55
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D
16.55
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