Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6*10-11 m^2/s and the diffusion flux is found to be 1.2*10-7 kg/(m^2*s). also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m^3. how far into the sheet from this high-pressure side will the concentration be 2kg/m^3? assume a linear concentration profile.

6.4 cm (max) - 25 cm (min)

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.