When 150 mg of lithium is added to 350 cm3 of water at 20 ∘C20\text{ }^\circ\text{C}20 ∘C under a pressure of 100 kPa, a reaction occurs producing a gas.
Write a balanced molecular equation for the reaction that occurs.
Calculate the volume, in cm3\text{cm}^3cm3, of the gas formed. (The gas constant R=8.31 J K−1 mol−1R = 8.31\text{ J K}^{-1}\text{ mol}^{-1}R=8.31 J K−1 mol−1, relative atomic mass Ar(Li)=6.9A_r(\text{Li}) = 6.9Ar(Li)=6.9)
Calculate the concentration, in mol dm−3\text{mol dm}^{-3}mol dm−3, of lithium ions in the resulting solution.
79 exam-style questions on AQA A Level Chemistry Amount of substance, covering Relative atomic mass and relative molecular mass, The mole and the Avogadro constant, The ideal gas equation, Empirical and molecular formula, and Balanced equations and associated calculations. Each one has a worked solution and a mark scheme showing where the marks go.