Explanation:
By losing or gaining electrons from its outermost orbit
 
        
                    
             
        
        
        
Because the intention is to boil the solution, the purpose of the solvent is to dissolve so it has a higher boiling point so ensure it stays in liquid form and doesn't evaporate into a gas
also, a pure solvent is made of 1 substance so it has 1 boiling point and the solution must evaporate/boil first
        
             
        
        
        
Answer:
C
Explanation:
The enthalpy of the reactants is greater than that of the products.