When a certain solid dissolves in water, the solution becomes cool. Is ?Hsoln for this solute positive or negative? Select the single best answer. Negative, because the temperature of the solution dropped. Positive, because as the solution forms, heat is absorbed. Negative, because as the solution is formed, heat is released. Positive, because as the solution is formed, heat is released.
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An endothermic process is one that absorbs heat from its surroundings. This means that the heat content of the system (in this case, the solution) increases. The change in enthalpy, ΔH, is a measure of the total energy of a system. If the system is absorbing Show more…
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When a certain solid dissolves in water, the solution becomes cool. Is $\Delta H_{\text {soln }}$ for this solute positive or negative? Explain your reasoning. Is the solubility of this substance likely to increase or decrease with increasing temperature? Explain your answer using Le Châtelier's principle.
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Commercial cold packs often contain solid $\mathrm{NH}_{4} \mathrm{NO}_{3}$ and a pouch of water. The temperature of the pack drops as the $\mathrm{NH}_{4} \mathrm{NO}_{3}$ dissolves in water. Therefore, for the dissolving of $\mathrm{NH}_{4} \mathrm{NO}_{3}$ in water, a. $\Delta \mathrm{H}_{\mathrm{soln}}$ is positive and $\Delta \mathrm{S}_{\text {soln }}$ is positive. b. $\Delta \mathrm{H}_{s \mathrm{son}}$ is positive and $\Delta \mathrm{S}_{\text {soln }}$ may be negative or positive c. $\Delta \mathrm{H}_{\text {slin }}$ is negative and $\Delta \mathrm{S}_{\text {spln }}$ may be negative or positive d. $\Delta \mathrm{H}_{\mathrm{seln}}$ is negative and $\Delta \mathrm{S}_{\mathrm{soln}}$ is positive
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