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i saw the answer on another question but am not sure its right?
An electronic vacuum tube was sealed off during manufacture at a pressure of 1.8X10^-5 torr @ 27degrees Celsuis.
Its volume is 100cm^3. Compute the number of molecules remaing in the tube.
n = PV/RT = 2.37x10^-8 atm x 0.100 L / (0.082057 x 300 K) = 9.62x10^-11 moles
9.62 x 10^-11 moles x 6.022 x 10^23 molecules/mole = 5.8x10^13 molecules
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