Stoichiometry
84 past-paper questions on Stoichiometry · examined 2020–2025.
20258 questions
100 cm3 of aqueous potassium hydroxide with a concentration of 1.00 mol / dm3 reacts with excess dilute sulfuric acid. 3.48 g of pure anhydrous potassium sulfate is produced. What is the percentage yield of potassium sulfate?
A mixture of 2 g of hydrogen and 32 g of oxygen occupies a volume, V, measured at r.t.p. The gases react until there is no further change. 2H2(g) + O2(g) 2H2O(l) Which reactant is in excess and what is the final volume of the mixture measured at r.t.p.?
A mixture of 2 g of hydrogen and 32 g of oxygen occupies a volume, V, measured at r.t.p. The gases react until there is no further change. 2H2(g) + O2(g) 2H2O(l) Which reactant is in excess and what is the final volume of the mixture measured at r.t.p.?
A chemist prepares 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?
A chemist prepares 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?
Calculate the mass of the sample of sodium hydrogencarbonate. Give your answer to two significant figures.
Calculate the volume of hydrogen formed when 1.35 g of sodium is added to excess ethanol, measured at room temperature and pressure.
Calculate the empirical formula of compound X containing nickel, carbon and oxygen.
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