Stoichiometry Mock Tests

What is the molarity of a solution prepared by dissolving 4 g of NaOH in enough water to make 500 mL of solution? (Na = 23, O = 16, H = 1)___SEQ___25

In the reaction 2A + B → 3C, if 4 moles of A react with 3 moles of B, which is the limiting reagent?

10.0 g of calcium carbonate (CaCO₃) is heated and decomposes completely according to: CaCO₃(s) → CaO(s) + CO₂(g). How many molecules of CO₂ are produced? (Avogadro's number = 6.022 × 10²³ mol⁻¹, molar mass of CaCO₃ = 100 g mol⁻¹)

10 g of CaCO₃ is heated to give 4.4 g of CO₂. The percentage yield of the reaction is (atomic masses: Ca = 40, C = 12, O = 16):

A sample of iron ore contains Fe₂O₃. On reduction with excess CO, 2.00 g of the ore produces 1.12 g of Fe. The percentage purity of Fe₂O₃ in the ore sample is (Atomic mass: Fe = 56, O = 16):

The mass of carbon in 44 g of CO₂ is (C = 12, O = 16):

In the reaction MnO₄⁻ + 5Fe²⁺ + 8H⁺ → Mn²⁺ + 5Fe³⁺ + 4H₂O, 0.02 moles of KMnO₄ react completely with Fe²⁺. How many grams of FeSO₄·7H₂O (M = 278 g/mol) were present?

14 g of N₂ reacts completely with H₂ to form NH₃. What mass of NH₃ is produced? (N = 14, H = 1)___SEQ___24