If the container is closed and the ethanol is allowed to reach equilibrium with its vapor, how many grams of liquid ethanol remain? express your answer to two significant figures and include the appropriate units.

Explanation:

Let us assume that the given data is as follows.

        V = 3.10 L,        T = = (19 + 273)K = 292 K

       P = 40 torr    (1 atm = 760 torr)

So,     P =

             = 0.053 atm

          n = ?

According to the ideal gas equation, PV = nRT.

Putting the given values into the above equation to calculate the value of n as follows.

                 PV = nRT

                 0.1643 =

                    n =

It is known that molar mass of ethanol is 46 g/mol. Hence, calculate its mass as follows.

               No. of moles =

                    mass = g

                              = 0.315 g

Thus, we can conclude that the mass of liquid ethanol is 0.315 g.

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