Explanation:
Upon dissolution of KCl heat is generated and temperature of the solution raises.
Therefore, heat generated by dissolving 0.25 moles of KCl will be as follows.
              
                 = 4.31 kJ
or,             = 4310 J      (as 1 kJ = 1000 J)
Mass of solution will be the sum of mass of water and mass of KCl.
        Mass of Solution = mass of water + (no. of moles of KCl × molar mass)
                                     = 200 g + 
                                     = 200 g + 13.625 g
                                     = 213.625 g
Relation between heat, mass and change in temperature is as follows.
                              Q = 
where,    C = specific heat of water = 
Therefore, putting the given values into the above formula as follows.
                      Q = 
             4310 J =  
      
                
 
Thus, we can conclude that rise in temperature will be  .
.