A) What is the change in energy when 23J of heat are added to a system and 11J of work are performed on the surroundings?
B) What is the change in energy for a constant pressure process where H = 23 J and 11 J of work are performed on the system? Hint: What is enthalpy equal to when pressure is constant?
C) Consider a process where the change in energy is 50 J and the change in enthalpy is -11 J. How much work was done if the process is carried out at constant pressure?