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May 23, 2015

Homework Help: chemistry

Posted by anonymousokm on Saturday, October 6, 2012 at 4:58pm.

A sample being given as a laboratory unknown is a mixture of calcium carbonate and magnesium carbonate. Both substances decompose to form calcium oxide and magnesium oxide, respectively, when heated at a high temperature for a prolonged period. An unknown sample weighing 5.424 grams was decomposed by heating for several hours at 950 C. The oxide residue which remained weighed 2.791 grams. From this laboratory data calculate the percent, by weight, of calcium car-bonate in the unknown.

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