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In an apparatus, two flasks are connected by a valve. Flask 1 contains 2 moles of CO(g) and Flask 2 contains 2 moles of O2(g), each in a volume of 4 L. The total combined volume is 8 L. The valve is opened and the reaction 2CO(g) + O2(g) -> 2CO2(g) goes to completion at a fixed temperature of 300 K. (R = 0.08 atm.L/mol.K). Which of the following are correct? (A) Partial pressure of O2 = 6 atm. (B) Number of moles of CO2 formed = 2. (C) Number of moles of O2 left = 1. (D) Partial pressure of O2 = 3 atm.

1. (A) Partial Pressure of O2 = 6 atm.
2. (B) Number of moles of CO2 formed = 2
3. (C) Number of moles of O2 left = 1
4. (D) Partial Pressure of O2 = 3 atm.

Correct answer: (B) Number of moles of CO2 formed = 2

Solution

CO (2 mol) is limiting; reaction consumes 2 mol CO + 1 mol O2 to form 2 mol CO2, leaving 1 mol O2; in the combined 8 L volume, P(CO2) = 6 atm and P(O2) = 3 atm — so statements B, C, and D are correct while A is wrong.

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