Posted by Zach on Tuesday, September 11, 2012 at 10:13am.
I believe you would subtract the dry weight of the alum from the wet alum weight, then divide that answer by the original weight of wet alum:
13.44g(wet) - 11.28g (dry) = 2.16g of water that was lost.
2.16g H20/ 13.44g wet alum =0.1607 X 100 = 16.07% H20 lost
Hope this helps :)
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