# How many atoms of each element is in CaCO_3?

Dec 2, 2016

Element: 1 atom
Compound: 2+ atoms
Ca - C - O3
Therefore: 5 atoms!
Molar mass is a different story:

#### Explanation:

Molar mass:
Add the atomic mass of whole equation
Ca: 40
C: 12
O: 16 since it is O3 times 16 by 3

$40 + 12 + 16 \left(3\right) = 100$ g/ml

100 is the molar mass of the formula