Mass of F to react with 101 g of K = 49.03 g
Further explanation
Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
With this law, we can calculate how many grams an element is needed to make a compound with a certain mass, as desired
The mass of compounding compounds can also be calculated.
For example, the mass ratio of oxygen (O) and hydrogen (H) elements in H₂O remains at 8: 1. So if you know the amount of mass of oxygen you can know the amount of hydrogen and water mass.
The mass ratio of K to F in a compound is 2.06:1, so the mass of F to react with 101 g of K :
[tex]\tt =\dfrac{1}{2.06}\times 101\\\\=\boxed{\bold{49.03~g}}[/tex]
