For chemical changes, why is the change in enthalpy more useful than the change in internal energy?

(i) Spontaneity of a process can be determined from the entropy change and also from the Gibbs free energy change. But the Gibbs free energy change in more useful than entropy change to determine the spontaneity of a process. Explain it. (ii) Show that Gibbs energy change of a system at certain temperature and pressure, DeltaG=DeltaH-TDeltaS .

What is the change in internal energy of a substance when it is heated?

Why is the heat of reaction of a reaction occurring in a bomb calorimeter equal to the change in internal energy of the reaction system?

Change in internal energy of a system is

An ideal gas undergoes four processes: isochoric, isobaric, isothermal and adiabatic. In which process is (i) the change in internal energy zero?

What is the change of entropy in irreversible adiabatic change?

(i) Show that heat of reaction at constant volume is equal to the change in internal energy of the system. (ii) Show that heat of reaction at constant pressure is equal to the change in enthalpy of the system.

In a process, 701J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process?

In a process, 600 J of heat is absorbed by asystem and 300 J of work is done by the system. Calculate the change in internal energy of the system.

In a process, 600J of heat is absorbed by a system and 300J of work is done by the system. Calculate the change in internal energy of the system.