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At 300 K , the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen N 2 at 4 bar. The molar mass of the gaseous molecule is

Options

  1. A224   g   mol - 1
  2. B112   g   mol - 1
  3. C56   g   mol - 1
  4. D28   g   mol - 1

Correct answer

B. 112   g   mol - 1

Step-by-step solution

d = PM wt RT d 1 P 1 M 1 = d 2 P 2 M 2 2 d 2 2 × M gas = d 2 4 × M N 2 M gas = 4 × M N 2 = 112   g   mol − 1 .

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