# How many atoms are there in 0.00150 moles of zinc? Please help me and explain it to me thanks

Mar 7, 2018

See Below

#### Explanation:

The concept of the "mole" is based on the number of atoms in a single isotope of carbon, Carbon-12. In 12g of Carbon-12 there is a mole of Carbon atoms, or $6.02 \times {10}^{23}$ atoms of carbon.

For the rest of the atoms on the periodic table, their molar mass tells you how many grams of each you need to have a mole of those atoms, or $6.02 \times {10}^{23}$ atoms of that element.

If zinc has 1 mole, it will have $6.02 \times {10}^{23}$. In chemistry we love to cancel units, so to solve your problem, we just cancel some units.

$\text{zinc atoms"="0.00150 moles Zn"xx(6.02xx10^23 \ "atoms")/"1 mole" = 9.03xx10^20 \ "atoms}$

If you just look at the units, this works out to:

("moles" xx "atoms")/"moles"

and this reduces to ATOMS.