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February 28, 2015

Homework Help: Chemistry. Check my answer please!

Posted by Sarah on Friday, November 21, 2008 at 3:41pm.

A 1.994 g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temp. above 170 C in a crucible until a constant mass is reached. The mass of anhydrous CaSO4 salt is 1.577 g.

Calculate the percent by mass of water in the hydrated calcium sulfate salt.

This is what I did....

1.577/1.944 * 100 = 79.09%

100-79.09 = 20.91% water.

Is this correct? Thanks for your help!

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