Mole Concept 2

5.6 g of impure iron was found to react with exactly 0.194 moles of hydrochloric acid. What was the percentage purity of the iron? What volume of hydrogen, measured at s.t.p was formed during the reaction? [Mr: Fe - 56]

Excess magnesium is added to 250cm3 of hydrochloric acid of concentration 30g/dm3. Find the concentration of the acid in mol/dm3. [Mr: HCl - 37]

10 g of barium nitrate is dissolved in 500cm3 of water to form a solution. Find the concentration of the barium nitrate solution in g/dm3 and mol/dm3.

20g of an impure sample of aluminium sulfate reacted with barium chloride and produced 38g of barium sulfate. Find the percentage purity of the sample of aluminium sulfate.

80g of iron(III) oxide reacts with an excess of carbon monoxide to yield 42g of iron, along with some carbon monoxide. What is the percentage yield of the reaction?