When a 2.00 g sample of KCl is dissolved in water in a calorimeter that has a total heat capacity of 1.28 kJ ⋅ K − 1 , the temperature decreases by 0.360 K . Calculate the molar heat of solution of KCl .

Answer : The molar heat of solution of KCl is, 17.19 kJ/mol

Explanation :

First we have to calculate the heat of solution.

where,

q = heat produced = ?

c = specific heat capacity of water =

= change in temperature = 0.360 K

Now put all the given values in the above formula, we get:

Now we have to calculate the molar heat solution of KCl.

where,

= enthalpy change = ?

q = heat released = 460.8 J

m = mass of = 2.00 g

Molar mass of = 74.55 g/mol

Now put all the given values in the above formula, we get:

Therefore, the molar heat of solution of KCl is, 17.19 kJ/mol