Aspecial flask used in the determination of densities, called a pycnometer, has a mass of 16.3179 g when empty, and it has a mass of 48.0250 g when filled with water at 20.0°c. when this same pycnometer is filled with ethyl alcohol at 20.0°c, it is found to have a mass of 41.3934 g. find the density of ethyl alcohol at 20.0°c. (given: at 20.0°c, the density of water is 0.9982 g/ml)

Density of ethyl alcohol at 20.0°C is 0.7895 g/ml.

Explanation:

Density is defined as the mass contained per unit volume.

Given : Mass of water = mass of pycnometer filled with water - mass of empty pycnometer = (48.0250 - 16.3179)g = 31.7071 g

Volume of pycnometer = volume of water = ?

Density of water =

Putting in the values we get:

Thus volume of  pycnometer = 31.76 ml

Now, Mass of ethyl alcohol = mass of pycnometer filled with ethyl alcohol - mass of empty pycnometer = (41.3934 - 16.3179)g = 25.0755 g

volume of pycnometer = volume of ethyl alcohol =  31.76 ml

Putting in the values we get:

Thus density of ethyl alcohol at 20.0°C is 0.7895 g/ml.

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