Question

A rock is placed on a scale and gives a reading of 76.89 grams. The rock is then placed in a graduated cylinder with 63.12 mL of water, the water rises to a volume of 73.54mL What is the density of the rock? (you answer must have a total of 2 decimals)

Answer 1

The density of the rock can be calculated using the formula:

density = mass / volume

To use this formula, we need to find the mass and volume of the rock.

Given:

- Mass of the rock = 76.89 grams
- Volume of water before adding the rock = 63.12 mL
- Volume of water after adding the rock = 73.54 mL

Volume of the rock = Final volume - Initial volume
Volume of the rock = 73.54 mL - 63.12 mL
Volume of the rock = 10.42 mL

Note that the volume of the rock is equal to the amount of water displaced by the rock when it was placed in the graduated cylinder.

Now we can use the formula to find the density:

density = mass / volume
density = 76.89 g / 10.42 mL
density = 7.38 g/mL

Therefore, the density of the rock is 7.38 g/mL (rounded to 2 decimal places).