A rock has a mass of 8.0 grams. When the rock is placed in 30mL of water, the water level is raised to 42 mL. What is the density of the rock?

1 Answer
Sep 15, 2016

Answer:

The density of the rock is #"0.67 g/cm"^3#.

Explanation:

The density (#ρ#) of anything is its mass (#m#) divided by its volume (#V#).

#color(blue)(bar(ul(|color(white)(a/a)ρ = m/Vcolor(white)(a/a)|)))" "#

The volume of the rock is equal to the volume of the water displaced

#V = "42 mL - 30 mL" = "12 mL" = "12 cm"^3#

#ρ = m/V = "8.0 g"/("12 cm"^3) = "0.67 g/cm"^3#