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A metal nitride contains $28 \%$ nitrogen by weight. The molecular formula of metal nitride is $M_3N_2$. What is the atomic weight of metal?

\[\begin {array} {1 1} (a)\;72 \\ (b)\;64 \\ (c)\;100 \\ (d)\;24 \end {array}\]
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(d) 24
answered Nov 7, 2013 by pady_1

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