The synthesis of water from Hydrogen and Oxygen is represented by the following chemical equation 2H2 + O2 --> 2H2O

If 6 mol of H2 burn with 6 mol of O2 which reactant is the excess reactant and how much excess in moles is leftover?

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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.