(a) A vessel contains N molecules of oxygen at a certain temperature and pressure. How many molecules of sulphur dioxide can the vessel accommodate at the same temperature and pressure? (b) Each of the two flasks contain 2.0 g of gas at the same temperature and pressure. One flask contains oxygen and the other hydrogen. (i) Which sample contains the greater number of molecules? (ii) If the hydrogen sample contains N molecules, how many molecules are present in oxygen sample?