234k views
2 votes
How many Mg atoms are present in 170g of Mg

User Foole
by
8.2k points

1 Answer

3 votes
In order to calculate the number of atoms, we must first know the number of moles present. And
moles = (mass present) / (molecular mass)
Therefore, the moles of Mg present are
170 / 24 = 7.08
The number of atoms in a mole of substance is given by Avagadro's Number which is 6.02 x 10^23
Since there are 7.08 moles, there are:
7.08 * 6.02*10^23
= 4.26 * 10^24 atoms
User Grayson Mitchell
by
7.5k points