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1. What is the difference between the heat of reaction, Qrxn, and the enthalpy of reaction,...

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Chemistry

1. What is the difference between the heat of reaction, Qrxn,and the enthalpy of reaction, Hrxn? (

2. In a coffee-cup calorimeter, 1.40 g of NH4NO3 is mixed with71.0 g of water at an initial temperature of 25.00 oC. Afterdissolution of the salt, the final temperature of the calorimetercontent is 23.39 oC. Assuming the solution has a heat capacity (Cp)of 4.18 J/ oC•g and assuming no heat loss to the calorimeter(surroundings), calculate the enthalpy change for the dissolutionof NH4NO3 in units of kJ/mol. (MW(NH4NO3) = 80.05 g/mol)

3. How do cold packs and hot packs work? What kind ofthermodynamic process is involved in a hot pack?

4. Who uses hot packs and cold packs? What kind of process isinvolved in a cold pack?

5. What is the chemical that is used in hot packs that use asuper cooled fluid? Why is that chemical a good choice for use tomanufacture a hot pack?

Answer & Explanation Solved by verified expert
3.6 Ratings (419 Votes)
1 No difference between the heat of reaction and enthalpy ofreaction both are same By definition enthalpy is the heatcontent2 As the final temperature is lower than the initialtemperature it is an endothermic    See Answer
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