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An empty RD bottle has a mass of 25.25 g. When filled with water, the bottle has a mass of 55.75 g. and 45.50 g when filled with alcohol. Find the volume of bottle and the RD of alcohol. Also find the density of alcohol.

Asked by sarojpullak | 17 Apr, 2020, 05:35: PM
Mass of empty bottle, mb = 25.25 g

When bottle is filled with water, the mass of bottle is, mbw = 55.75 g

Thus, mass of water, mw = 55.75 - 25.25 g = 30.5 g

When filled with alcohol, mass of the bottle is, mba = 45.50 g

Thus, mass of alcohol, ma = 45.50 - 25.25 = 20.25 g

Volume of bottle = volume occupied by water

We know,
density =  mass/ volume

density of water = 1 g/cm3

mass of water = 30.5 g
Thus, volume of water, vw = mw / 1 = 30.5 cm3
Hence,
volume of bottle =  30.5 cm3
volume occupied by water = voulme occupied by alcohol = 30.5 cm3

density of alcohol = mass of alcohol/ volume of alcohol = 20.25/30.5 = 0.66 g/cm3 = 0.7 g/cm3
Answered by Shiwani Sawant | 17 Apr, 2020, 07:22: PM

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