![]() After heating, the mass of the anhydrous compound is found to be 3.22 g. H 2O -> 8.09 g / 18.015 g/mol = 0.449 molĮxample #2: A hydrate of Na 2CO 3 has a mass of 4.31 g before heating. The original location of this document is here.Įxample #1: A 15.67 g sample of a hydrate of magnesium carbonate was heated, without decomposing the carbonate, to drive off the water. ![]() Here's a worksheet with eight hydrate problems, all of which have (hand-written) solutions. Ten problems Calculate empirical formula when given mass data Fifteen problems Calculate empirical formula when given percent composition data A list of all the problems Determine identity of an element from a binary formula and a percent composition Mole Table of Contents Determine identity of an element from a binary formula and mass data If your results are not within 0.03 grams of your previous heating, reheat, cool, and weigh until it does! (This may take several heatings).ChemTeam: Determine the formula of a hydrate: fifteen examplesĭetermine the formula of a hydrate: fifteen examples ![]() If your results come within 0.03 g of the mass of the previous heating, begin your calculations. After allowing it to cool again (with the lid completely on), reweigh the crucible and its contents.
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