So, 639 milliliters = 0.639 liters.
The ideal gas law is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
We know P (0.657 atm), V (0.639 L), R (0.0821 L·atm/K·mol, the value for R
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