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Question

A density bottle weighs 20.25g when empty,  40.75g when filled with a liquid and 50.25g when filled with water.  Find (a) Volume of the bottle ; (b)  Density of the liquid. 


Solution

(a) mass of the empty  bottle: 25g 
volume of empty bottle=(mass of bottle filled with water- mass of empty bottle )/density of water
volume of empty bottle=(55-25)/(1g/ml)=30ml 

(b)density of empty bottle =mass of the empty  bottle/ volume of empty bottle
=25g/30ml
=(5/6)g/ml
=0.83g/ml

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