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Question

A mixture of CO and CO2 is found to have a density of 159 g/litre at 30oC and 730mm. The % mole composition of CO2 is__________. (as nearest integer)

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Solution

The molar mass of mixture of CO and CO2 can be obtained in two ways .The comparison of two moles gives values of each

(I) Let n1 mole of CO and (100n1) mole of CO2 are presented in 100 mole

avg molar mass=n128+(100n1)44100

(II) Also for mixture P=(730/760)atm T=303K ,d=1.50glitre1

PV=WmRT

P=WVmRT

730760 =1.50M*0.821*303

M=38.85gmol1

A comparison of equation (1) and (ii) yields n1=32.19

mole % of CO=32.190

and Mole % of CO2=67.81

so nearest integer is 68.


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