Answer:
1.38 x [tex]10^{24}[/tex] atoms
Explanation:
To get grams to atoms/molecules/particles we need to first convert grams > moles > atoms. This also applies in the other direction, where you have moles as that stepping stone.
Some key information we need:
Magnesium's molar mass= 24g/mol
Avogadro's Number= 6.022 x [tex]10^{23}[/tex] atoms
Where there is 1 mol per 6.022 x [tex]10^{23}[/tex] atoms
*This maybe be something you want to memorize.
Grams to moles using molar mass , then to atoms using avogadro's number.
55g Mg x [tex]\frac{1 mol}{24g/mol}[/tex] x [tex]\frac{6.022 x 10^{23} atoms }{1 mol}[/tex] = 1.38 x [tex]10^{24}[/tex] atoms
