A sealed vessel holds nitrogen dioxide, NO2\mathrm{NO_2}NO2. Altogether, the molecules in the vessel contain 1.806 × 1024 atoms.
Relative atomic mass (ArA_rAr): N = 14.0 O = 16.0
The Avogadro constant is 6.02 × 1023.
Calculate the mass of nitrogen dioxide in the vessel.
134 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.