Question

4. You have 4.0 x 10^24 particles of MgO. How many moles are present?

Answer 1

To calculate the moles present in the given molecules we will apply Avogadro's number. Avogadro's number tells us that in one mole of any substance there are 6.022x10^23 molecules. Therefore if we have 4.0x10^24 molecules we will have:

$\begin{gathered} MolMgO=GivenMoleculesMgO\times\frac{1molMgO}{6.022\times10^{23}molecules} \\ MolMgO=4.0\times10^24MoleculesMgO\times\frac{1molMgO}{6.022\times10^{23}molecules} \\ MolMgO=6.6molMgO \end{gathered}$

In 4.0x10^24 particles o molecules, there are 6.6 moles of MgO