How Many Molecules Exist in a Cubic Centimeter at 10^-15 atm and 20°C?

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How many molecules exist in one cubic centimeter of space at a pressure of 10^-15 atm and temperature of 20 degrees C?
 
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PV = nRT
Where P pressure, V volume, T absolute temperature, n number of moles and R is a constant
You can find the units and value of R in the tetbook or wiki.