How many moles of H2 are required to give off 2501 kJ of heat in the
following reaction?
N2 (g) - 3 H2 (g) → 2 NH3 (g) AH° =
-91.3 kJ/mol

catya your not at all which answer i've seen you do this on another question!

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.