Hello, Jahnine,
Are the two measurements you provided all the sata that is available? When I see "hydrate" and "crucible" in the same problem, I usually will see an exoperiment in which the hydrate was heated to drive out the water. But with only two data points: 1) empty crucible, and 2) crucible + hydrate, we can only make one calculation. The difference of the two is the mass of the hydrate that was placed on the crucible. It is the question that was asked, so (13.7861g - 12.7825g) = 1.0036 gram is the mass of the hydrate.
Perhaps this is the answer to the question (it is), but I was wondering if there was more to the problem than just this.
Bob
