A molecular modelling program represents a hydrocarbon, M. Each molecule of M contains 8 carbon atoms joined by 9 carbon-carbon single covalent bonds. All the other bonds from carbon atoms are to hydrogen atoms. Each hydrogen atom forms one single covalent bond to one carbon atom.
Calculate the molecular formula of M.
Show your working.
The model is changed so that each molecule has one fewer carbon-carbon bond but still contains 8 carbon atoms. All the bonds are single covalent bonds and the carbon atoms remain joined in one molecule.
Predict the molecular formula of the changed molecule. Explain your answer.
122 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.