7. How many moles of magnesium is 3.01times 10^22 atoms of magnesium?

The question is asking us to convert the number of atoms of magnesium into moles. We know that one mole of any substance contains Avogadro's number of entities, which is $6.022 \times 10^{23}$. So, to find the number of moles, we need to divide the given number of atoms by Avogadro's number. <br /><br />Let's denote the number of moles as n. The formula to calculate the number of moles is:<br /><br />\[n = \frac{Number\,of\,atoms}{Avogadro's\,number}\]<br /><br />Substituting the given values into the formula, we get:<br /><br />\[n = \frac{3.01 \times 10^{22}}{6.022 \times 10^{23}}\]<br /><br />After performing the division, we find that the number of moles of magnesium is approximately 0.05.