The dissolution of ammonium nitrate into water is the most common reaction found
ID: 1031204 • Letter: T
Question
The dissolution of ammonium nitrate into water is the most common reaction found in "cold" packs. This reaction would be classified as an A/ (endothermic/exothermid) reaction where the total change in energy of the reaction has a (positive/negative) sign. When zinc reacts with hydrochloric acid in solution it produces zinc chloride and hydrogen gas. In this scenario, work is done A (on/by) the system A/ (on/by) the surroundings and the work component of the internal energy change would have a (positive/negative) sign.Explanation / Answer
Dissolution of ammonium chloride in water is Endothermic Process because after dissolution the solution becomes very cold means that energy is being absorbed to dissolve the ammonium nitrate. As this process in endothermic so the total change in the energy of the system has positive sign.
Suppose we perform the reaction of Zinc and HCl in a container which is fitted with a piston to it. Now when the reaction will start, hydrogen gas will be librated. This hydrogen gas will cause the piston to move up or will expand the system. So we can say that it does work on the piston. Therefor here
work is done by the system and on the surrounding. The work component of the internal energy change would have a negative sign because in chemistry it is supposed to be that work is done by the system at the cost to intenal energy so there is loss of internal energy.
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