Question

What is the mass density of a rock of mass 300 g that has an apparent mass of 200 g in water?

Answer 1

The density is 3.00 grams/ ml

Explanation:

The rock weighs 100 grams less in water than it does in air

`300g - 200 g = 100 g`

The density of water is `1g/1 ml`

so 100 gram difference means 100 ml of water were displaced.

`(100 g/1) / (l g/ 1 ml)` xx ( 1 ml/ 1 g) / (1 ml / 1 g ) = 100 ml

so the volume of the rock is 100 ml.

Density = Mass / Volume.

Density = `300 g / 100 ml` = 3 g/ ml