November 29, 2015

Homework Help: Chemistry

Posted by Zawng on Tuesday, September 10, 2013 at 10:37am.

A 28.4378 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 17.6846 g. Assuming that only the magnesium carbonate had
decomposed, how much magnesium carbonate was present in the original sample?
Answer in units of g

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