An impure 5.00 g sample thought to be MgCO₃ is heated until it completely decomposes…
CHEMISTRY · Subjective · A Level · Chemistry · Amount of substance · Amount of substance
Problem
An impure 5.00 g sample thought to be MgCO₃ is heated until it completely decomposes according to
MgCO₃ (s) → MgO (s) + CO₂ (g).
The solid residue (MgO) has a mass of 1.60 g. Calculate the percent purity of MgCO₃ in the original sample (answer to the nearest percent).