A gas cylinder contains 2 point 0 mol of gas cap x and 6 point 0 mol of gas cap y at a total pressure of 2 point 1 atm. What is the partial pressure of gas cap y ? Use the fraction with numerator cap p sub A and denominator cap p sub cap t is equal to the fraction with numerator n sub A and denominator n sub cap t

The partial pressure of gas Y is its mole fraction multiplied by the total pressure. There are 2.0 + 6.0 = 8.0 mol total, so gas Y’s mole fraction is 6.0/8.0 = 0.75. Its partial pressure is 0.75 × 2.1 atm = 1.575 atm, which rounds to 1.6 atm. Thus the correct choice is A, 1.6 atm.

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