Chemistry · May / June 2021 · Paper 11 · Question 10

A chemist wants to make calcium nitrate. They start with 8.00 g of pure calcium oxide and an excess of dilute nitric acid. They produce 12.65 g of pure, dry anhydrous calcium nitrate crystals. What is the percentage yield of calcium nitrate? [relative atomic masses, $A_r$: Ca, 40; N, 14; H, 1; O, 16]

1. A54.0
2. B63.2
3. C67.1
4. D86.8

As printed in the paper