Greetings!
I could use some help with this question:
3.40g of CaSO4 (M=136g mol-1) is formed when 4.30g of hydrated calcium sulfate is heated to constant mass. How many moles of water of crystallisation are combined with each mole of calcium sulfate?
A: 1
B: 2
C: 3
D: 4
.. I have been baffled with this question, not knowing where I am supposed to start.
Cheers