Modern vacuum pumps make it easy to attain pressures of the order of 10^ -13 atm in the laboratory.?

At a pressure of p and an ordinary temperature (say T = 300 K), how many molecules are present in a volume of V? Take Avagadro's number to be NA and the gas constant to be R.

1 Answer

  • Ideal gas law: P*V = n*R*T

    #molecules = n * NA

    #molecules = P*V*NA/(R*T)

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