Balanced equations and reacting massesEdexcel A-Level Chemistry: Mind map

Exam questions on Balanced equations and reacting masses

1. A student reacts 2.50 g of marble chips (calcium carbonate) with excess dilute hydrochloric acid in a conical flask.
   Calculate the volume of carbon dioxide produced at room temperature and pressure. M(CaCO₃) = 100.1 g mol⁻¹ and the molar volume of a gas is 24.0 dm³ mol⁻¹.2 marks
2. A student mixes 20.0 cm³ of 0.150 mol dm⁻³ aqueous lead(II) nitrate with excess aqueous potassium iodide. A precipitate forms.
   Calculate the maximum mass of lead(II) iodide formed. M(PbI₂) = 461.0 g mol⁻¹.2 marks
3. A student adds 1.20 g of magnesium ribbon to 50.0 cm³ of 0.500 mol dm⁻³ aqueous copper(II) sulfate and stirs. The mixture warms up.
   Write an ionic equation, with state symbols, for the reaction and explain the observations in terms of this equation.3 marks