Answer: [tex]MgCl_2[/tex]
Explanation:
25.3% Mg
74.7% Cl
First step: change % to g
25.3g Mg
74.7g Cl
Second step: calculate g/mol of each compound. You can do this by using the atomic mass.
[tex]25.3gMg(\frac{1mol}{24.30g})=1.04mol[/tex]
[tex]74.7gCl(\frac{1mol}{35.45g} )=2.11mol[/tex]
Third step: determine the lowest number and divide everything by it. Of the result, extract whole number only.
[tex]Mg=\frac{1.04}{1.04} =1[/tex]
[tex]Cl=\frac{2.11}{1.04}=2[/tex]
Fourth step: Write each compound with their respective number below.
This empirical formula should be: [tex]MgCl_2[/tex]
