A drop in water temperature is observed when 0.873 g of ammonium nitrate is added. The enthalpy change for this reaction is +0.280 kJ. Which of the statements is accurate? O a) The AHsoln for ammonium nitrate is +25.7 kJ/mol so this is an endothermic process where energy in the form of heat is absorbed from the surroundings. b) The AH process where energy in the form of heat is released into the surroundings. soln for ammonium nitrate is -25.7 kJ/mol so this is an exothermic c) The AHsoln for ammonium nitrate is -25.7 kJ/mol so this is an exothermic process where energy in the form of heat is absorbed from the surroundings. O d) The AH soln for ammonium nitrate is +25.7 kJ/mol so this is an endothermic process where energy in the form of heat is released into the surroundings.
A drop in water temperature is observed when 0.873 g of ammonium nitrate is added. The enthalpy change for this reaction is +0.280 kJ. Which of the statements is accurate? O a) The AHsoln for ammonium nitrate is +25.7 kJ/mol so this is an endothermic process where energy in the form of heat is absorbed from the surroundings. b) The AH process where energy in the form of heat is released into the surroundings. soln for ammonium nitrate is -25.7 kJ/mol so this is an exothermic c) The AHsoln for ammonium nitrate is -25.7 kJ/mol so this is an exothermic process where energy in the form of heat is absorbed from the surroundings. O d) The AH soln for ammonium nitrate is +25.7 kJ/mol so this is an endothermic process where energy in the form of heat is released into the surroundings.
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.62QE: A 50-mL solution of a dilute AgNO3 solution is added to 100 mL of a base solution in a coffee-cup...
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
Transcribed Image Text:A drop in water temperature is observed when 0.873 g of ammonium nitrate is
added. The enthalpy change for this reaction is +0.280 kJ. Which of the statements
is accurate?
O a) The AH soln for ammonium nitrate is +25.7 kJ/mol so this is an endothermic
process where energy in the form of heat is absorbed from the surroundings.
b) The AHsoln for ammonium nitrate is -25.7 kJ/mol so this is an exothermic
process where energy in the form of heat is released into the surroundings.
c) The AH°soln for ammonium nitrate is -25.7 kJ/mol so this is an exothermic
process where energy in the form of heat is absorbed from the surroundings.
d) The AHsoln for ammonium nitrate is +25.7 kJ/mol so this is an endothermic
process where energy in the form of heat is released into the surroundings.
Transcribed Image Text:A solution of AgNO3 (100.0 mL, 0.300 M ) reacts with a solution of HCI (100.0 mL,
0.300 M) in a coffee-cup calorimeter and the temperature rises from 21.80 °C to
23.20 °C. Assuming the density and specific heat of the resulting solution are 1.00
g/mL and 4.184 J/(g -°C), respectfully, what is the value of AH®rxn?
kJ/mole.
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