An empty RD bottle has a mass of 30.25 g. When filled with water ,the bottle has a mass of 50.65 g and 35.50 g when filled with alcohol.Find the a) volume of the bottle ,b) RD of alcohol. *
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Density of water = 1 g cm³
(a) Volume of density bottle
Mass of empty density bottle = M1 = 21.8g
Mass of bottle + water = M2 = 41.8g
So, mass of water completely filling the density bottle = M2-M1
= 41.8 - 21.8 = 20g
1g of water has volume =cc
So, Volume of bottle = volume of water = 20cc = 20ml
(b) The relative density of liquid
Mass of 20 cc of liquid
= (mass of density bottle + mass of 20cc of liquid) - mass of density bottle
= 40.6 - 21.8
= 18.8 g
Mass of 20 cc of water = 20g
Relative density of liquid
R.D = \frac{Mass\ of\ 20\ cc\ of\ liquid}{Mass\ of\ 20\ cc\ of\ water}=\frac{18.8}{20}=0.94\
Mass of 20 cc of water
Mass of 20 cc of liquid
=
20
18.8
=0.94
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