The molecular weight of O2 and SO2 are 32 and 64respectively. If one litre of O2 at 15∘C and 750mmpressure contains 'N' molecules, the number of molecules in two litres of SO2 under the same conditions of temperature and pressure will be

At same temperature and pressure, equal volumes have equal number of molecules. If 1 lit. of oxygen consists N molecules then at same temperature and pressure 1 lit of SO2 will consists N molecules. So 2 lit. of SO2 will contain 2N molecules.