Calculate the total number of ions in 2.25 g2.25\text{ g}2.25 g of magnesium chloride, MgCl2\text{MgCl}_2MgCl2. Use the following values: Relative atomic mass of magnesium, Ar(Mg)=24.3A_r(\text{Mg}) = 24.3Ar(Mg)=24.3, Relative atomic mass of chlorine, Ar(Cl)=35.5A_r(\text{Cl}) = 35.5Ar(Cl)=35.5, Avogadro constant, NA=6.02×1023 mol−1N_A = 6.02 \times 10^{23}\text{ mol}^{-1}NA=6.02×1023 mol−1. Give your answer to 3 significant figures in scientific notation.
199 exam-style questions on OCR A A Level Chemistry Atoms and reactions, covering Atomic structure and isotopes, Compounds, formulae and equations, Amount of substance, Acids, and Redox. Each one has a worked solution and a mark scheme showing where the marks go.