Homework Help: Chemistry

Posted by Sara on Monday, September 24, 2012 at 10:47pm.

A 2.914 gram sample of gypsum, a hydrated salt of calcium sulfat, CaSO4, is heated at a temperature greater than 170 degrees Celcius in a crucible until a constant mass is reached. The mass of the anhydrous CaSO4 salt is 2.304 grams. Calculate the percent by mass of water in the hydrated calcium sulfate salt

Chemistry - DrBob222, Monday, September 24, 2012 at 11:22pm
2.914-2.304 = loss in mass = mass H2O lost.
%H2O = (mass H2O/mass sample)*100 = ?

Note: A more interesting problem is to calculate the formula of the hydrated CaSO4 from these data.
Chemistry - Jessica, Sunday, February 17, 2013 at 1:37pm
1.88
Chemistry - Jessica, Sunday, February 17, 2013 at 1:37pm
1.88
Chemistry - Jessica, Sunday, February 17, 2013 at 1:38pm
1.88

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