The elements x and y combine in different ratios to form four different types of compounds: xy, xy₂, xy₃, and xy₄. consider that there is enough of each sample to contain 2 g of x, and the mass of x is estimated to be 2 g and the mass of y is estimated to be 4 g.
arrange the following ratios in order of their increasing value. (the exercise gives me three tabs to put in order from highest to least. these are in the pic)

rank from highest to lowest ratio. to rank items as equivalent, overlap them.
i put xy₄ as highest, then xy₃ in the middle, and xy₂ as lowest. is this order correct? i'm not quite understanding this lesson : // so if i could also get some sort of an explanation, that'd be

Yeah, it would be that order since if XY was a number, you would multiply it by that number 4 total times. So it would be a large number. And then it gets smaller and smaller when it gets to XY2. So yeah you got the order correct.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

the link still does not work even when adding it to the url bar

explanation: