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April 21, 2015

Homework Help: chemistry

Posted by savannah on Wednesday, December 19, 2012 at 6:59pm.

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: NH_4NO_3(s) rightarrow NH_4 ^ +(aq)+ NO_3 ^ -(aq)
In order to measure the enthalpy change for this reaction, 1.25g of NH_4NO_3 is dissolved in enough water to make 25.0mL of solution. The initial temperature is 25.8 ^\circ {\rm C} and the final temperature (after the solid dissolves) is 21.9 ^\circ {\rm C}. Calculate the change in enthalpy for the reaction. (Use 1.0g/mL as the density of the solution and 4.18J/g * {\rm{^\circ C}}} as the specific heat capacity.)

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