What is the enthalpy for the reaction
represented in the following energy
diagram?
+200 kJ
+350 kJ
potential energy
100 150 200 250 300 350 400 450 500
+150 kJ
+250 kJ
progress

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

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.