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Question

The mass of 5.6 dm3 of a certain gas at STP is 12.0 g. Calculate the relative molecular mas of the gas.


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Solution

Step 1: Mass of 5.6 dm3 of a certain gas a S.T.P = 12 g

Step 2:No. of moles =VolumeatS.T.P22.4

Step 3:Volume at STP =MassMolecularweight×22.4

Molecular weight =125.6×22.4

=48g/mole

Therefore, relative molecular mass of gas is 48g /mole.


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