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Question

896 mL of a mixture of CO and CO2 weight 1.28 g at NTP. Calculate the volume of CO2 in the mixture at NTP.

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Solution

Let the weight of CO in the mixture be x g.

Total weight of mixture =1.28g

Weight of CO2=1.28x

Moleculr weight of CO=28g

Molecular weight of CO2=44g

Moles of CO2 in the mixture =1.28x44

Moles of CO in the mixture =x28

At NTP, the volume occupied by 1 mole of a gas =22400mL

896 mL occupied by 122400×896=0.04 moles

Total moles in the mixture = 0.04 moles

Moles of CO2+ Moles of CO=0.04

1.28x44+x28=0.04

35.8428x+44x=49.28

16x=13.44

x=0.84

Molecular weight of CO2=1.280.84=0.44g

Moles of CO2 in the mixture =0.4444=0.01 moles

Volume occupied by 1 mole of CO2=22400mL

Volume occupied by 0.01 mole of CO2=22400×0.01=224mL

Hence, at NTP, 224 mL of CO2 is present in the mixture.

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