When 175.OmL of water containing HCl at 21.0°C is added to 35.OmL of water containing NaOH at 21.0°C in a foam cup calorimeter, the
temperature of the solution increases to 39.6°C. Calculate the enthalpy
change of this reaction.

you gotta add the following molecules so we can give u an answer

explanation:

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.