Question

How many atoms are in .1785 mmol magnesium?

Answer 1

There are `1.0749*10^20` atoms in 0.1785 millimoles of magnesium.

Explanation:

First, convert millimoles into moles:

`.1785` mmol = `1.785 * 10^-4` moles

Then multiply by Avogadro's number (6.022x10^23 atoms/mole)

`1.785 * 10^-4` moles x `6.022*10^23` atoms/mole = `1.0749*10^20` atoms.

This method works no matter what the element or compound is.