19. Which of the following best describes the motion of the particles in a piece of steel? Nons are moving.
b.
A few are moving.
c. All are moving
d Most are moving

Explanation:

The given data is as follows.

   Density of vinegar = 1.0 g/ml

   Specific heat capacity = 4.25

    = ,  and   =

Relation between enthalpy and specific heat is as follows.

Hence, putting the values into the above formula as follows.

                  =          (as density = )

                               = - 315 J

Thus, we can conclude that the enthalpy of reaction is -315 J.

As the value is negative so, it means that heat is releasing. Hence, the reaction is exothermic in nature.