Convert grams to moles for both elements by dividing the mass by it’s molar mass (Mr). Hg- 47.30/201= 0.23 mols Cl- 16.70/35= 0.47 mols
Now, divide the moles of both elements with the smallest number. The smallest number here is 0.23. Hg- 0.23/0.23= 1 Cl- 0.47/0.23= 2.04 (since there is a 0 after the decimal we will forget the decimal and write the number as a whole.)
