We are being asked to identify ΔU or internal energy, heat (q), work (w) and enthalpy (ΔH). The internal energy (ΔE or ΔU) of a system can be calculated from the heat and work of the system. The relationship between internal energy, heat, and work is shown in the following equation:
A process is carried out on a system at constant external pressure. During the process 150. J of heat moves from the surroundings to the system, and the system expands, performing 400.J of work. The values for q, w, ΔU, and ΔH for the process are:
a. q = -150.J, w = 400.J, ΔU = 250.J, ΔH = -150.J
b. q = 150.J, w = 400.J, ΔU = 550.J, ΔH = 550.J
c. q = 150.J, w = 400.J, ΔU = 550.J, ΔH = 150.J
d. q = 150.J, w = -400.J, ΔU = -250.J, ΔH = -250.J
e. q = 150.J, w = -400.J, ΔU = -250.J, ΔH = 150.J
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