A coffee-cup calorimeter initially contains water at . Potassium bromide (), also at , is added to the water, and after the dissolves, the final temperature is . Calculate the enthalpy change for dissolving the salt in and . Assume that the specific heat capacity of the solution is and that no heat is transferred to the surroundings or to the calorimeter.

the correct answer would be d. hope this !

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.