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Molarity

A mixture of ...

Question

A mixture of CO and CO2 is found to have a density of 1.5 g/L at 30°C and 730 torr . What is the composition of the mixture .

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Solution

Molecular mass of the mixture M = dRTP==1.5×0.0821×303×760730=38.85gm/mol
Let the total number of moles be 'x'.
Let 'x' = no. of moles of CO.Then no. of moles of CO2 = (1 - x)
Molecular Mass of mixture = x × 28 + (1 - x)44 = 38.85
⇒ x = 0.3218
% of CO = 32.18 and % CO2 = 67.82

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