Hello!
* First Step: to know Avogrado's Law
We know that by the Law of Avogrado, for each mole of substance we have 6.02*10²³ atoms, if:
** Second Step: to know the molar mass of the solute
The molar mass of of magnesium = 24.30 g/mol
*** Third step: make the ratio mass / mol with atoms
1 mol we have 6.02*10²³ atoms
1 mole of Mg we have 24.30 g
Then we have:
24.30 g ------------- 6.02*10²³ atoms
x ----------------------- 6.98*10^24 atoms
[tex] \dfrac{24.30}{x} = \dfrac{6.02*10^{23}}{6.98*10^{24}} [/tex]
multiply cross
[tex] 6.02*10^{23}*x = 24.30*6.98*10^{24} [/tex]
[tex] 6.02*10^{23}\:x = 1.69614*10^{26} [/tex]
[tex] x = \dfrac{1.69614*10^{26}}{6.02*10^{23}} [/tex]
[tex] \boxed{\boxed{x \approx 281.75\:grams}}\end{array}}\qquad\checkmark [/tex]
I Hope this helps, greetings ... DexteR! =)
