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nstant cold packs sometimes used to treat athletic injuries contain solid ammonium nitrate and liquid water...

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Chemistry

nstant cold packs sometimes used to treat athletic injuriescontain solid ammonium nitrate and liquid water separatedbya thindivider. When the divider is broken, the ammonium nitrate dissolvesendothermically:

NH4NO3(s) NH4+(aq) + NO3–(aq)

To measure the enthalpy of this reaction, you dissolve 1.25 g ofammonium nitrate in enough water to make 25.0 mL of solution. Theinitial temperature is 25.8 °C, and the final temperature is 21.9°C. (Assume that the density of the solution is 1.00 g /mL and thatthe heat capacity of the solution is 4.184 J/g∙°C

Answer & Explanation Solved by verified expert
3.9 Ratings (423 Votes)
Answer Given mass of NH4NO3 125 g water volume 250 mL ti 258oC tf 219oC density 1009 gmL Specific    See Answer
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