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March 28, 2015

Homework Help: NEED HELP!

Posted by Mary on Thursday, November 5, 2009 at 11:48pm.

A mixture contained CaCO3 and MgCo3. A sample of this mixture weighing 7.85g was reacted with excess HCl. The reactions are--
CaCO3 + 2HCl --> CaCl2 + H2O + CO2

MgCO3 + 2HCl --> MgCl2 + H2O + CO2

Is the sample reacted completely and produced 1.94L of CO2, at 25 degrees C, 785mmhg, whre were the percentages of CaCO3 and MgCO3 in the mixture?

So far, I got the moles of CO2 by using PV=nRT, which is .0817moles of CO2,

I don't kno what to do next.. can anyone PLEASE help!

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