Hey
Need help with a few questions to do with hydrated salts
formula is XSO4.5H20
the mean amount of H20 in mol that was removed after the samples were heated is the mass/18 in my case 0.84/18 = 0.046666666?
So the mean amount (in mol) of the anhydrous salt is the mol of the H20 divided by 5? because of the ratio 1:5
this means the mol of the anhydrous salt is 0.00933333333
If thats so the molar mass of the anhydrous salt is the mass/mol so 1.21/0.00933333? which is roughly 130?
so the molar mass of X should be 130-96 (96 is the molar mass of the SO4
I get all this but what confuses me is when doing the molar mass of the water, why is the coefficient not included? How do you know when to include the coefficient and when not to? because you dont include it then but then you do when doing the ratio?
could someone explain it to me and tell me whether the steps I did were correct? thanks
Also whats the mean % by mass of H20 in the hydrated salt?
is it the (mass of the H20/mass of hydrated salt)*100 or is it the molar mass of water divided by the molar mass of the entire formula? if the second how would this work because I don't know the molar mass of X