Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH4NO3(s)→NH4+(aq)+NO3−(aq)NH4NO3(s)→NH4+(aq)+NO3−(aq) In order to measure the enthalpy change for this reaction, 1.35 gg of NH4NO3NH4NO3 is dissolved in enough water to make 20.5 mLmL of solution. The initial temperature is 24.5 ∘C∘C and the final temperature (after the solid dissolves) is 20.0 ∘C∘C. Calculate the change in enthalpy for the reaction in kJkJ. (Use 1.0gmL−11.0gmL−1 as the density of the solution and 4.184Jg−1∘C−14.184Jg−1∘C−1 as the specific heat capacity.) Express your answer to two significant figures and include the appropriate units.
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH4NO3(s)→NH4+(aq)+NO3−(aq)NH4NO3(s)→NH4+(aq)+NO3−(aq) In order to measure the enthalpy change for this reaction, 1.35 gg of NH4NO3NH4NO3 is dissolved in enough water to make 20.5 mLmL of solution. The initial temperature is 24.5 ∘C∘C and the final temperature (after the solid dissolves) is 20.0 ∘C∘C. Calculate the change in enthalpy for the reaction in kJkJ. (Use 1.0gmL−11.0gmL−1 as the density of the solution and 4.184Jg−1∘C−14.184Jg−1∘C−1 as the specific heat capacity.) Express your answer to two significant figures and include the appropriate units.
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 95IL: Insoluble AgCl(s) precipitates when solutions of AgNO3(aq) and NaCl(aq) are mixed. AgNO3(aq) +...
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Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction:
In order to measure the enthalpy change for this reaction, 1.35 gg of NH4NO3NH4NO3 is dissolved in enough water to make 20.5 mLmL of solution. The initial temperature is 24.5 ∘C∘C and the final temperature (after the solid dissolves) is 20.0 ∘C∘C.
NH4NO3(s)→NH4+(aq)+NO3−(aq)NH4NO3(s)→NH4+(aq)+NO3−(aq)
In order to measure the enthalpy change for this reaction, 1.35 gg of NH4NO3NH4NO3 is dissolved in enough water to make 20.5 mLmL of solution. The initial temperature is 24.5 ∘C∘C and the final temperature (after the solid dissolves) is 20.0 ∘C∘C.
Calculate the change in enthalpy for the reaction in kJkJ. (Use 1.0gmL−11.0gmL−1 as the density of the solution and 4.184Jg−1∘C−14.184Jg−1∘C−1 as the specific heat capacity.)
Express your answer to two significant figures and include the appropriate units.
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