A piston is held at constant pressure and allowed to expand or contract. The piston is charged with gas and heated to 325K. The volume of the piston is initially 350 cm3. The piston is then cooled to 290K. What is the new volume of the piston?

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.