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A compound contains $$28\%$$ nitrogen and $$72\%$$ metal by mass. 3 atoms of the metal combine with 2 atoms of the nitrogen. The atomic weight of the metal is __________
Correct Answer: 24
The compound is $$\text{M}_3\text{N}_2$$, so the masses of metal and nitrogen are in the ratio $$3M \colon 28 = 72 \colon 28$$. Hence $$3M = 72$$ and $$M = 24$$ (magnesium, in $$\text{Mg}_3\text{N}_2$$).
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