**REMEMBER ** TO CONVERT GRAMS (MASS) TO MOLES WE DIVIDE THE WEIGHT OF ONE MOLE FROM THE PERIODIC TABLE INTO THE GIVEN NUMBER OF GRAMS FOR EXAMPLE: SINCE CaCO 3 CONTAINS 1Ca FROM THE PERIODIC TABLE WE USE 40grams x 1 1 C FROM THE PERIODIC TABLE WE USE 12 grams x1 3 O FROM THE PERIODIC TABLE WE USE 16 grams x 3 (1x 40) + (1x 12) + (3 x 16) = 100 THE MASS OF ONE MOLE OF CALCIUM CARBONATE IS 100 grams IN OUR PROBLEM WE ARE USING 200 grams of CaCO 3 DIVIDING 200grams by 100grams per mole of CaCO 3 WE FIND THAT WE HAVE EXACTLY 2 MOLES OF THE CALCIUM CARBONATE REACTANT.
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