What is the ratio of densities of 2 gases, O2 & N2, having partial pressures in the ratio 2:3?(a) 16/21(b) 12/7(c) 21/16(d) 7/12This question was addressed to me in a job interview.I need to ask this question from Kinetic Theory topic in section Kinetic Theory of Physics – Class 11

What is the ratio of densities of 2 gases, O2 & N2, having partial pre

1.	What is the ratio of densities of 2 gases, O2 & N2, having partial pressures in the ratio 2:3?(a) 16/21(b) 12/7(c) 21/16(d) 7/12This question was addressed to me in a job interview.I need to ask this question from Kinetic Theory topic in section Kinetic Theory of Physics – Class 11
Answer» The correct answer is (a) 16/21 Easiest explanation: The RATIO of MOLES is the same as the ratio of PARTIAL pressures. The ratio of DENSITIES: d1/d2= (m1/V)/(m2/V) = m1/m2= (n1M1)/(n1M2), where n is the number of moles and M is the molecular mass.d1/d2= (2/3)*(16/14) = 16/21.

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