page 06 13. Under the same conditions of temperature and pressure, which of the following gases would occupy the largest volume? A 0·20 g of hydrogen B 0·44 g of carbon dioxide C 0·60 g of neon D 0·80 g of argon 14. 3CuO  +  2NH3  ↓  3Cu  +  N2  +  3H2O What volume of gas, in cm3, would be obtained by reaction between 100 cm3 of ammonia gas and excess copper(II) oxide? All volumes are measured at atmospheric pressure and 20 °C. A 50 B 100 C 200 D 400 15. Cl2(g)  +  H2O(ℓ)  Ý  Cl−(aq)  +  ClO−(aq)  +  2H+(aq ) The addition of which of the following substances would move the above equilibrium to the right? A Hydrogen B Hydrogen chloride C Sodium chloride D Sodium hydroxide 16. When 3·6 g of butanal (mass of one mole = 72 g) was burned, 124 kJ of energy was released. What is the enthalpy of combustion of butanal, in kJ mol−1? A −6·2 B +6·2 C −2480 D +2480