Heat and Thermodynamics 4 Question 18

20. Two non-reactive monoatomic ideal gases have their atomic masses in the ratio 2:3. The ratio of their partial pressures, when enclosed in a vessel kept at a constant temperature, is 4:3. The ratio of their densities is

(2013 Adv.)

(a) 1:4

(b) 1:2

(c) 6:9

(d) 8:9

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Solution:

  1. ρ=pMRTρpM

or ρ1ρ2=(p1p2)(M1M2)=(23)(43)=89



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