Question

There are two different compounds of sulfur and fluorine. In SF6, the mass of fluorine per gram of sulfur is 3.55 g F/g S. In the other compound, SFX, the mass of fluorine per gram of sulfur is 1.18 g F/g S. What is the value of X for the second compound

Answer 1

SFx... it has 1mol of Sulfur, then with the information that they gives us.

Calculating the grams of Fx
1g / 1.18 g(F)= 32,06g (S)/grams (F)

Once we have got the grams, we now can calculate the number of moles....

Mol= grams(F)/ molar mass =xxx mol ... this will be the answer

Answer 2

1.18 x 3 = 3.55
you need to find the ratio of F to F in each compound. this is the law of multiple proportions stating that the masses of one element which combine with a fixed mass of the second element are in a ratio of whole numbers. here, in this case F would be the "one element" and S would be the "fixed mass", the ratio of F6 to Fx = 3:1
therefore x would be 2 since there is less F in SFx and the ratio is 3:1. divide 6 by 3 and you get 2.