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May 29, 2015

Homework Help: Chemistry

Posted by Jordan on Tuesday, December 2, 2008 at 10:22pm.

A 20.29 g sample of impure MgCO3 is completely decomposed at 1000oC in previously evacuated 2.0 L reaction vessel. After the reaction was complete the solid residue had a mass of 15.9 g. Assume that only MgCO3 could produce gas CO2 what percent of original sample was magnesium carbonate? What was the pressure of the CO2 produced?

So far I have found that 20.29g MgCO3 makes 10.59g CO2 or .24 mol.

And I know that the equation that I need to use is PV/T = PV/T. But I am stuck after that.

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