The table gives formulae for molecular compounds formed by hydrogen and elements in one group of the Periodic Table. Germanium, Ge\mathrm{Ge}Ge, is also in this group.
| Element | Formula of compound with hydrogen |
|---|---|
| carbon | CH4\mathrm{CH_4}CH4 |
| silicon | SiH4\mathrm{SiH_4}SiH4 |
Use the information in the table to explain how the formula of the compound formed by germanium and hydrogen can be predicted.
Include the formula in your answer.
A sample of the germanium compound contains 1.50 × 1022 germanium atoms.
Calculate the total number of atoms in the sample.
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.