When 15.0 g of a salt was dissolved in 68.8 g of ethyl alcohol, the temperature of the solution decreased from 25.0 °c to 6.0 °c. the specific heat capacity for ethyl alcohol is 2.440 j/g°c. calculate the heat of reaction (∆h) in units of kj/g. (equation 1 and equation 2 will be .)

Explanation:

As we know that,

It is given that, = 15 g of salt,   = 68.8 g of ethanol

Therefore, total mass is as follows.

    Total mass =

                       = (15 + 68.8) g

                       = 83.8  g

Also, change in temperature is as follows.

              dT =

                    =

Now, the relation between heat energy, specific heat and mass is as follows.

               Q =

                   =

                   = -3884.968 J

Therefore, heat of the reaction is as follows.

                       =

                      = 258.99 J/g

As 1 J = 0.001 kJ. So, heat of reaction in kJ is 0.2589 kJ/g.

Thus, we can conclude that heat of reaction is 0.2589 kJ/g.