Please help How many liters of CO2 are produced when 32.6 liters of propane gas, C3H8 reacts with excess oxygen at STP?

C3H8+5O2——4H2O+3CO2

"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.