Question

# 3.49g of ammonia at STP occupies a volume of 4.48 $${ dm }^{ 3 }$$ calculate the molar mass of ammonia.

A
13.25 g/mol
B
14.59 g/mol
C
17.45 g/mol
D
None of these

Solution

## The correct option is C 17.45 $$g/mol$$Volume = 4.48 $$dm^3$$ = 4.48 LGram Molecular Mass = 22.4 L at STPSo,4.48 L of ammonia gas weighs = 3.49 g22.4 L of ammonia weighs = $$\frac{22.4 \times 3.49}{4.48}$$= 17. 45 g / molChemistry

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