Question

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.

Answer 1

Mass of empty density bottle (M₁) = 30 g

Mass of bottle + Water (M₂) 75 g

Mass of liquid + Liquidx (M₃) = 65 g

Mass of water = M₂ − M₁ = 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