# Question & Answer: A gaseous mixture containing 1.5 mol Ar and 3.5 mol CO_2 has a total pressure of…..

A gaseous mixture containing 1.5 mol Ar and 3.5 mol CO_2 has a total pressure of 7.3 atm. What is the partial pressure of CO_2? 2 atm 1 atm 17 atm 5 atm 7 atm

Number of moles of argon, nAr = 1.5 mol

Number of moles of argon, nCO2 = 3.5 mol

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Total pressure of the gaseous mixture, P = 7.3 atm

According to Dalton’s law of partial pressure,

The partial pressure of CO2, PCO2 = Mole fraction of CO2 X Total pressure of the mixture.

or, PCO2 = nCO2/(nCO2 + nAr) X 7.3 atm = 3.5/(3.5 + 1.5) X 7.3 atm = 5.11 atm $\approx$ 5 atm