Sum

The mass of an empty density bottle is 30 g, it is 75 g when filled completely with water and 65 g when filled completely with a liquid. Find relative density of liquid.

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#### Solution

Mass of empty density bottle (M_{1}) =30 g

Mass of bottle + Water (M_{2}) 75 g

Mass of liquid + Liquidx (M_{3})= 65 g

Mass ofwater=M_{2}—M_{1}=75—30=45 g

Mass of water in the density bottle =75 — 30 = 45 g

∴ Volume of water in density bottle = 45 cc

and mass of equal volume of liquid in density bottle 65—30 = 35g

R.D. of liquid = `("mass of 45 cc of liquid" )/("mass of 45 cc of water")`= `35/45`=`7/9`

=0.77

Concept: Determination of Density of a Liquid

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