1. Find the change in internal energy, when 175 J of work is done on a system that evolves 50 J of heat to surroundings. 2. Find the change in internal energy, when a gas absorbs 28 kJ of heat and has 13kJof work done on it 3. Consider the following reaction in a container with a movable piston: A(l) + B(l) = C (g). The change in internal energy is 760 J. As the piston moves up, the system absorbs 839 J of heat from its surroundings. a.Is work done on the system. 4. Consider the following reaction in a container with a movable piston: A(l) + B(l) = C (g). The change in internal energy is 760 J. As the piston moves up, the system absorbs 839 J of heat from its surroundings. How much work was done?

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