Question

A rock weighs 80 g on a triple beam scale. The same rock is then gently placed inside a graduated cylinder containing 30 mL of water. If the water level in the graduated cylinder rises to 75 mL. What is the density of the rock

Answer 1

• 1.78 g/cm³

Explanation:

80 g rock displaces water:

• 75 ml - 30 ml = 45 ml = 45 cm³

Density = mass / volume:

• d = 80 g / 45 cm³
• d = 1.78 g/cm³ (rounded)