Calculate the number of molecules in 0.16 g of sulfur dioxide. Give your answer to two significant figures.
Relative formula mass (MrM_rMr): SO2=64\text{SO}_2 = 64SO2=64
Avogadro constant = 6.02×1023 per mole6.02 \times 10^{23}\text{ per mole}6.02×1023 per mole
258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.