# How do you calculate the relative formula mass (M) of calcium carbonate? Relative atomic masses C = 12, O = 16, Ca = 40?

##### 1 Answer

100

#### Explanation:

To calculate the relative formula mass of calcium carbonate, we first need to write out its formula. It's an ionic compound formed between calcium ion

There are several ways to figure out the formula, one of the easier way is using the cross-over method. You may watch it here:

How to Write formula for Ionic Compound

After crossing over the number of the charges in

To calculate the relative formula mass, we'll need to count the number of atoms that are present in

How to Count Atoms

In

1 Ca

1 C

3 O

And then, we multiply with its atomic mass and add them all up, like this,

Relative formula mass