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A level chem - ideal gas equations

Calculate the relative molecular mass of a gas which has a density of 2.615g dm-3 at 298K and 101kPa

Ok so I’ve got the working out and the answer but I want to know why the volume is 1dm-3

V= 1dm-3
Moles = pV/rt
Moles = 101000*(1/1000) / 8.31*298
Moles = 0.0408

Mass= density * volume
Mass = 1*2.615
Mass= 2.615

Mr = mass /moles
Mr= 2.615 / 0.0408
Mr = 64.09

I understand the working out and everything but I just don’t know where the volume is from. Why is it 1dm3 ? Thanks
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Pigster
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Original post by CalypsoXenoo
2.615g dm-3

I understand the working out and everything but I just don’t know where the volume is from. Why is it 1dm3 ? Thanks


The density value is grams per cubic decimeter, i.e. 1 dm3 of the gas has a mass of 2.615 g.
Thanks :smile:

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