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A nitrogen–hydrogen gaseous compound has hydrogen making up 12.5% of its mass. Its density with respect to hydrogen is 16. What is the molecular formula of this compound?

1. NH₂
2. N₃H
3. NH₃
4. N₂H₄

Correct answer: N₂H₄

Solution

The correct option, N₂H₄, is derived from the given mass percentage of hydrogen and the density ratio, which indicates that the compound contains two nitrogen atoms for every four hydrogen atoms, aligning with the calculated molecular formula.

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