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Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B . Under such conditions, the density of A is found to be 1.5 times the density of B . The ratio of molecular weights of A and B is

Options

  1. A3 4
  2. B2
  3. C1 2
  4. D2 3

Correct answer

A. 3 4

Step-by-step solution

P A =   ρ A RT M A ,   P B =   ρ B RT M B ⇒   P A P B =   ρ A ρ B   M B M A = 2 ⇒ 3 2 M B M A = 2 So, M A M B   = 3 4

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