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# CHEMISTRY QUESTION PLEASE HELP?

A 2.65 g sample of an unknown gas at 39 ∘C and 1.05 atm is stored in a 2.65 L flask.

What is the density of the gas?

density:

g/L

What is the molar mass of the gas?

molar mass:

g/mol

### 2 Answers

Relevance

- Roger the MoleLv 74 weeks agoBest Answer
(2.65 g) / (2.65 L) = 1.00 g/L

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n = PV / RT = (1.05 atm) x (2.65 L) / ((0.082057338 L atm/K mol) x (39 + 273) K) = 0.1087 mol

(2.65 g) / (0.1087 mol) = 24.4 g/mol

- 4 weeks ago
Density = m/v

M is molar mass. You know the mass, and you can find the number of moles.

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It's telling you baloney. My answer is clearly marked: "1.00 g/L" not "1.00 L/g". Besides, the reciprocal of 1.00 is 1.00. I find it suspicious that mass in the question is 2.65 and the volume is 2.65. Did these numbers get copied correctly.