Mass, Weight and Density Questions and Answers - Form 1 Topical Mathematics

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Questions

  1. A piece of metal has a volume of 20 cm3 and a mass of 300g. Calculate the density of the metal in kg/m3.
  2. 2.5 litres of water density 1g/cm3 is added to 8 litres of alcohol density 0.8g/cm3. Calculate the density of the mixture

Answers

  1. Density = (300 x 1,000,000)/(20 x 1000)
    =15,000 kg/m
    3
  2. D = M/V
    Mas = D x V
    = 1g/cm3 x 2500cm
    3
    = 2500g..........................................(i)
    Mass = 0.8 x 8000
    = 6400g .....................................(ii)
    total mass = (2500 + 6400)g
    = 8900g
    Density of mixture = 8900g/cm
    3/10500

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