## Chemistry 9th Edition

a.1) $\Delta$E = q + w (The internal energy is the sum of the heat and the work.) a.2) $\Delta$E = -47kJ + 88kJ = 41kJ (Plug in values for q and w) b.1) $\Delta$E = q + w (The internal energy is the sum of the heat and the work.) b.2) $\Delta$E = 82kJ + -47kJ = 35kJ (Plug in values for q and w) c.1) $\Delta$E = q + w (The internal energy is the sum of the heat and the work.) c.2) $\Delta$E = 47kJ + 0kJ = 47kJ (Plug in values for q and w) d) The only one with a positive w is letter a.