Consider the gas law:
, where n is the number of moles and R is the gas constant given by, R = 8.314 J•K-1
The number of molecules is given by:
, where NA is Avogadro's number.
The lowest pressure attainable using the best available vacuum techniques is about 10-12N/m2.
At such pressure, how many molecules are there per cm3 at 13 °C?
Express your answer using two significant figures.
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