The atmospheric pressure is the sum of the

  • A
    Pressure of the biomolecules
  • B
    Vapour pressure of atmospheric constituents
  • C
    Vapour pressure of chemicals and vapour pressure of volatiles
  • D
    Pressure created on to atmospheric molecules

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Under similar conditions of temperature and pressure,$50 \ mL$ of gas $A$ diffuses through a hole in the same time that $40 \ mL$ of gas $B$ diffuses. If the molar mass of gas $A$ is $64$,what is the molar mass of gas $B$?

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Write the formula to calculate the pressure of a dry gas collected over water.

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What is the coefficient of viscosity? Give its unit.

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