A 450 cm3 sample of nitrogen at 120 kPa and 20 ∘C20\ ^\circ\text{C}20 ∘C was mixed with 1.85 × 10-2 mol of helium. 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.
What is the mole fraction of nitrogen in the mixture?
0.350.350.35
0.450.450.45
0.550.550.55
0.650.650.65
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.