True or false Heat of reactions are always equal to DH NaOH is hygroscopic substance, slowness...

True or false

Heat of reactions are always equal to DH

NaOH is hygroscopic substance, slowness in weighing and dissolution in water will result in an increase in the calculated heat of solution

In the heat of solution experiment changing NaOH to KOH will change the DH value

Heat of solution is always negative (exothermic)

Expert Solution

a. Heat of reactions are always equal to DH False

Exp: Change in enthalpy is amount of heat evolved or absorbed in a reaction

a. NaOH is hygroscopic substance, slowness in weighing and dissolution in water will result in an increase in the calculated heat of solution False.

Exp: Aqueous solutions of hygroscopic salts will absorb or release water. It depends on the temperature and relative humidity of the surroundings. Neither mass transfer nor heat transfer would occur.

a. In the heat of solution experiment changing NaOH to KOH will change True

According to Hess law " For any reaction, the enthalpy change depends on reactants and products and is independent of the pathway or the number of steps between the reactants and products". So, if we replace NaOH with KOH enthalpy will change.

a. Heat of a solution is always negative (endothermic) is false.

Exp: Heat of a solution is always positive (exothermic). The enthalphy change of a solution can be positive (endothermic ) or negative (exothermic).

queen_honey_blossom answered 11 months ago

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