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A student dissolves 12.4g of ammonium nitrate (NH4NO3) in 200.g of water in a well-insulated open cup. She then observes the temperature of the water fall from 21.0°C to 16.9°C over the course of 7 minutes. NH4NO3(s) → NH+4(aq) + NO−3(aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 2 significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. 1. Is this reaction exothermic, endothermic, or neither? 2.If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. = kJ 3.Calculate the reaction enthalpy ΔHrxn per mole of NH4NO3. = kJ/mol

A student dissolves 12.4g of ammonium nitrate (NH4NO3) in 200.g of water in a well-insulated open cup. She then observes the temperature of the water fall from 21.0°C to 16.9°C over the course of 7 minutes. NH4NO3(s) → NH+4(aq) + NO−3(aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 2 significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. 1. Is this reaction exothermic, endothermic, or neither? 2.If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. = kJ 3.Calculate the reaction enthalpy ΔHrxn per mole of NH4NO3. = kJ/mol

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter6: Thermochemisty
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A student dissolves 12.4g of ammonium nitrate (NH4NO3) in 200.g of water in a well-insulated open cup. She then observes the temperature of the water fall from 21.0°C to 16.9°C over the course of 7 minutes.

NH4NO3(s) → NH+4(aq) + NO−3(aq)

You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 2 significant digits.

Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction.

1. Is this reaction exothermic, endothermic, or neither?

2.If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case.
= kJ
3.Calculate the reaction enthalpy ΔHrxn per mole of NH4NO3.
= kJ/mol
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