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Question

What is the density at STP of a diatomic gas whose gram-formula mass is 80 g/mol?

A
1.9 g/L
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B
2.8 g/L
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C
3.6 g/L
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D
4.3 g/L
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E
5.0 g/L
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Solution

The correct option is B 3.6 g/L
PV=nRT

PV=wMRT

PM=wVRT

PM=ρRT

Density ρ=PMRT

Density ρ=1×80.0.08206×273=3.6g/L
STP conditions corresponds to a pressure of 1 atm and temperature of 273 K.

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