~BrightestStar~
Blue Crack Supplier
sami0201 said:
Yeah ok so that's the molar mass of it....so now how do I convert that to moles? To go from mass to moles we do 1mol/249.682? That doesn't feel right.....I might just be going nuts though
The question is calculate the moles of anhydrous salt
I feel like I'm going in circles but I'm confusing myself...
See I'm confused because the mass of the anhydrous salt like if you put it on a scale is 1.3g (when you do crucible&salt - crucible alone) But I guess I don't need to use that number?
None of my friends can help me (talking about friends at school, not you )
Deep breaths my dear. Clear thine mind.
I may have only contributed to your confusion.
Anyway, one, see that site I posted above. It's got sample calclations.
Ok, you want the number of moles of the anhydrous salt (aka WITHOUT water)
So you get your mass of the salt after it's been heated.
(final mass minus mass of crucible)
You calculate the molar mass of unhydradted copper sulfate (aka the MMof CuSO4) which is 159.608 g/mol
Now, to find the moles of the unhydrated salt simply use the good old
n = m/MM
Aka
The number of moles = (dry mass) / 159.608
make sense?