Question

Question #544a2

Answer 1

Use Avogadro's Number to calculate the number of atoms in a mole

Explanation:

Avogadro's Number = `6.0221409 xx 10^23 mol^-1`

Avogadro's Number tells you the number of atoms in 1 mole of any element. To calculate the number of atoms, you simply multiply the number of moles you have by Avogadro's number:

Number of atoms = Number of Moles x Avogadro's Number

Worked example

How many atoms of Li in 2.9 moles of Li?

Number of atoms of Li = `2.9 mol xx (6.0221409 xx 10^23 mol^-1)`
Number of atoms of Li = `1.7464208 xx 10^24`