Homework Help: AP Chemistry i need help!

Posted by Rafael on Tuesday, September 4, 2012 at 10:58pm.

A 21.5997 g sample of impure magnesium carbonate was heated to complete decomposition
according to the equation
MgCO3(s) → MgO(s) + CO2(g).
After the reaction was complete, the solid
residue (consisting of MgO and the original
impurities) had a mass of 15.5207 g. Assuming that only the magnesium carbonate had
decomposed, how much magnesium carbonate was present in the original sample?
Answer in units of g

AP Chemistry i need help! - DrBob222, Wednesday, September 5, 2012 at 12:15am
21.5997-15.207 = ? = mass CO2
g CO2 x (1 mol MgCO3/1 mol CO2) = g MgCO3.
AP Chemistry i need help! - Aka, Wednesday, September 5, 2012 at 12:35pm
I don't know eather!
AP Chemistry i need help! - Aka, Wednesday, September 5, 2012 at 12:35pm
I don't know eather!
oops--typo - DrBob222, Wednesday, September 5, 2012 at 2:09pm
That should be 21.5997-15.5207 = mass CO2.
To Aka! - DrBob222, Wednesday, September 5, 2012 at 2:10pm
I assume you mean either.

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