Posted by Anna on Thursday, March 12, 2009 at 10:01pm.
1 mol Potassium = 39g [Atomic Mass of K]
x mol Potassium = 25g
x = 25*1/39 = 0.641 mol
Hope that helps.
I would remove the 1 and make the answer 0.64 since there are only two significant figures in 25 and 39.
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