Density
2 marks · NormalA measuring cylinder contains 80 ml of oil. The mass of the oil is found to be 68 g.
Calculate the density of the oil in kg/m³. Give your answer to 2 significant figures.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
850 kg/m³ (±10)
Common mistakes: Failure to convert ml to m³; Leaving answer in g/cm³
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Correct conversion of units and substitution into the density equation.
A1 · 1 mark · Final answer correct to 2 significant figures and correct unit.
Worked solution
Convert mass: 68 g = 0.068 kg.
Convert 80 ml = 80 cm³ = 80 × 10⁻⁶ m³ = 0.00008 m³.
Final answer: 850 kg/m³.