What is the mole fraction of 2.0 g of a compound of relative molecular mass 100.0 dissolved in 30.0 g of a solvent of relative molecular mass 60.0?
1.0×10−21.0 \times 10^{-2}1.0×10−2
3.8×10−23.8 \times 10^{-2}3.8×10−2
4.0×10−24.0 \times 10^{-2}4.0×10−2
6.7×10−26.7 \times 10^{-2}6.7×10−2
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.