A marble fragment that has weathered in an acidic environment is suspected to be…
CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A marble fragment that has weathered in an acidic environment is suspected to be impure calcium carbonate (CaCO3) mixed with inert clay. A 3.50 g sample of the fragment is crushed and reacted completely with excess aqueous hydrochloric acid. The reaction releases 0.985 g of carbon dioxide gas that is collected and weighed.
(a) Determine the number of moles of carbon dioxide produced during the reaction.
(b) Calculate the mass of pure calcium carbonate that must have been present in the sample.
(c) Compute the percent purity of calcium carbonate in the marble fragment.
(d) Find the mass of the inert clay impurity in the original 3.50 g sample.