Question

A sample of magnesium carbonate is heated and the mass of magnesium oxide produced found to be 80g. Calculate the mass of decomposed magnesium carbonate if the yield of the reaction is 80%.

Answer 1

$MgCO_3-->MgO+CO_2$

Moles of $MgO=\frac{80}{40.3044}=1.94moles$

Mass of $MgCO_3=84.3139×1.94=162.73grams$

Mass$=\frac{162.73×80}{100}=130.184grams$