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Posted by on Monday, November 9, 2009 at 12:09am.

CaSO4.2H2O ==> CaSO4 + 2H2O

moles CaSO4.2H2O = 15.00 g x (1 mole CaSO4.2H2O/172.172) = 0.08712 moles.

moles CaSO4 = same.
grams CaSO4 = moles CaSO4 x molar mass CaSO4 = ??

Wait,.. how do I know the moles CaSO4?

do I do .08712* CaSO4's gfm?

  • Chemistry - , Monday, November 9, 2009 at 10:49am

    sorry i'm a bit confused, what are we trying to find?

  • Chemistry - , Monday, November 9, 2009 at 12:43pm

    I recognize this from my post last night. Since you have 0.08712 mole of CaSO4.2H2O AND there is 1 mole CaSO4 per 1 mole CaSO4.2H2O (from the equation), then you must have 0.08712 mole CaSO4.
    Then moles CaSO4 x molar mass CaSO4 = grams CaSO4. It's approximately 12 grams.

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