If the molecular mass of $N H_{3}$ is $17$ , determine the density of ammonia at STP.

0.25 g / L

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0.76 g / L

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1.52 g / L

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3.04 g / L

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9.11 g / L

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Solution

The correct option is A $0.76 g / L$
The molecular mass of $N H_{3}$ is 17 g/mol.
Hence, 1 mole of ammonia weighs 17 g.
At STP, 1 mole of ammonia will occupy a volume of 22.4 L
The density is the ratio of mass to volume.
The density of ammonia is $\frac{17 g}{22.4 L} = 0.76 g / L$ .

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