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Question

At NTP, the density of a gas, whose molecular weight is 45, is

A
44.8 g/L
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B
11.4 g/L
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C
2 g/L
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D
3 g/L
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Solution

The correct option is C 2 g/L
The density of any substance is calculated as Density = mass / volume.

One mole of any gas at STP will occupy a volume of 22.4 L (standard molar volume). The gas in question would have a molar mass of 45 g/mol.

Therefore, the density of your gas is: D = m/V = 45 g / 22.4 L = 2.0 g/L

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