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.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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