Calculate the mass of gas present in the container using the ideal gas equation.
P = pressure, atm
V = volume, L
n = moles, mol
R = gas constant = 0.08206 (L·atm)/(mol·K)
T = temperature, K
The vapor pressure of ethanol (C2H5OH) at 19˚C is 40.0 torr. A 0.900-g sample of ethanol is placed in a 2.80 L container at 19˚C. If the container is closed and the ethanol is allowed to reach equilibrium with its vapor, how many grams of liquid ethanol remain?
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