Posted by Emily on Friday, October 28, 2011 at 7:50am.
I ASSUME that is 0.25M and not 0.25m. M means molarity. m means molality.
How many moles do you need? That will be M x L = 0.500 x 0.25M = ?
moles Na2SO4.10H2O = grams/molar mass.
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