Imagine a container placed in a tub of water, as depicted in the accompanying diagram.
(a) If the contents of the container are the system and heat is able to flow through the container walls, what qualitative changes will occur in the temperatures of the system and in its surroundings? What is the sign of q associated with each change? From the system's perspective, is the process exothermic or endothermic?
(b) If neither the volume nor the pressure of the system changes during the process, how is the change in internal energy related to the change in enthalpy?

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