Calculate the total number of atoms in 13.5 g of ethylamine, C2H5NH2\text{C}_2\text{H}_5\text{NH}_2C2H5NH2.
(relative formula mass: C2H5NH2=45\text{C}_2\text{H}_5\text{NH}_2 = 45C2H5NH2=45; Avogadro constant = 6.02 × 1023)
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.