page 06 7. The enthalpy of combustion of methanol (GFM = 32.0 g) is -726 kJ mol-1. What mass of methanol has to be burned to produce 145.2 kJ? A 3.2 g B 6.4 g C 32.0 g D 160.0 g 8. Which of the following statements is true? A The sodium atom is larger than the sodium ion. B The chloride ion is smaller than the chlorine atom. C The magnesium ion is larger than the magnesium atom. D The oxygen atom is larger than the oxide ion. 9. Which of the following structures is never found in compounds? A Covalent molecular B Covalent network C Monatomic D Ionic 10. Which of the following carbon containing compounds is an isomer of hexanal? A 2-methylbutanal B 3-methylpentan-2-one C 2,2-dimethylbutan-1-ol D 3,3-dimethylpentanal