Asked by Ann

A 2.446-g sample thought to contain only one volatile substance, MgCO3, was heated in a nitrogen atmosphere for 30 min. After cooling, the residue weighed 2.216 g. Calculate the percentage of magnesium carbonate in the sample.

Answers

Answered by DrBob222
MgCO3 ==> MgO + CO2

Wt loss on heating = mass CO2 = 2.446 - 2.216 = 0.230g CO2
Convert to moles. moles = grams/molar mass
moles CO2 = moles MgCO3 in the sample.
g MgCO3 in the sample = moles MgCO3 x molar mass MgCO3

%MgCO3 = (mass MgCO3/mass sample)*100 = ?
Answered by Ann
Thanks DrBob222 :)
Answered by ESM
The answer is 18.01% :))
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