Hello, me again. I have come across another question which I really can't seem to be able to get my head around. If you could help, I would be extremely happy. (not kidding, since im very frustrated at the moment).
Q:
A student was asked to find the relative atmic mass of an element X. Crystals of the choride of X were known to have the formula XCl
2.6H
2O.
The student dissolved 2.03g of the crystals in water, and then added an axcess of silver nitrate solution to the solution formed. A white precipitate of silver chloride was formed, which was filtered, dried and weighed. 2.87g were formed.
Ag
+(aq) + Cl
-(aq) -> AgCl
(s) Calculate:
(a) the number of moles of silver chloride formed
(b) the number of moles of X chloride in the solution (you may assume that all the chlorine in X chloride is in solution as Cl
-(aq) ions
(c) the mass of 1 mole of XCl
2.6H
2O
(d) the relative atmic mass of X.
I have already calculated (a), which was quite easy:
2.87/143.5 = 0.02mol
Yet i have not a clue how to start on (b)
Thanks