What is the mass of 1 L of a gas at STP whose molar mass is 254 g/mol?

11.3 g

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25.4 g

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30.6 g

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76.5 g

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254 g

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Solution

The correct option is A 11.3 g
1 mole of any gas at STP occupies a volume of 22.4 L.
1 L at STP corresponds to $\frac{1}{22.4} = 0.0446$ moles.
The molar mass is 254 g/mol.
The mass of 1 L of a gas at STP will be $254 \times 0.0446 = 11.3$ g.

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