February 27, 2017

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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