CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance
Problem
Which statement best explains how adding an inert, non-reacting solid to a weighed sample affects the calculated percent purity of the desired compound, assuming the amount of desired compound present is unchanged?
(a) Percent purity remains unchanged because the inert solid does not participate in the reaction or in the calculation.
(b) Percent purity may increase or decrease depending on the molar mass of the inert solid added.
(c) Percent purity decreases because the sample mass increases while the mass of the desired compound stays the same.
(d) Percent purity increases because the inert solid’s mass is not counted when determining the yield of the desired compound.