Arelative density bottle weighs 0.03kg when empty and 0.057kg when full of water. what will it weigh when full of kerosene of relative density 0.8?

The mass of the kerosene is, =  0.021 kg  

Explanation:

Given data,

The mass of the empty density bottle, m₁ = 0.03 kg

The mass of density bottle filled with water, m₂ = 0.057 kg

The relative density of kerosene is, ρ = 0.8

                   Density of kerosene =  Density of water x relative density

                                                      = 1000 kg/m³ x 0.8

                                                      = 800 kg/m³

 The mass of water in the bottle,

                                = m₂ - m₁

                                                          = 0.057 kg -  0.03 kg

                                                          = 0.027 kg

The volume of bottle,

                                     V = 2.7 x 10⁻⁵ m³

The mass of the kerosene,

                                      = 800 x 2.7 x 10⁻⁵

                                                               = 0.021 kg

Hence, the mass of the kerosene is, =  0.021 kg  

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