2. A solution of silver nitrate was combined with a solution of hydrochloric acid to produce solid silver chloride and aqueous nitric acid. The initial temperature of each solution was 22.60 °C and the final temperature of the mixture was recorded at 23.40 °C. The mass of the reaction was 100.00 g and the specific heat capacity of the solution was 4.18 J/g.°C. Calculate the heat that accompanies this reaction in kJ/mol. Is the reaction endothermic or exothermic?
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.
![Life University
General Chemistry I Lab
CHM 111L
Hess's Law
Pre Lab
1. Enthalpy is a state function. What does it mean to be a state function?
2. A solution of silver nitrate was combined with a solution of hydrochloric acid to produce solid silver
chloride and aqueous nitric acid. The initial temperature of each solution was 22.60 °C and the final
temperature of the mixture was recorded at 23.40 °C. The mass of the reaction was 100.00 g and the
specific heat capacity of the solution was 4.18 J/g.°C. Calculate the heat that accompanies this reaction
in kJ/mol. Is the reaction endothermic or exothermic?
3. Consider the following set of reactions:
Overall reaction: CHale) + NH3(8) → HCN) + 3 H2e)
AHoveral = ??? kJ
AH = -91.8 kJ
Reaction 1: N2(e) + 3 H2e) → 2 NH3)
Reaction 2: Cs) + 2 H2e) → CHA8)
Reaction 3: H2ige) + 2 Cs) + N2e) → 2 HCN()
AH2 = -74.9 kJ
AH3 = +270.3 kJ
a. What must be done to Reaction 1 to get NH3 on the reactant side?
What is the
resulting value of AH,?
(Do not forget the unit)
b. What must be done to Reaction 2 to get CH, on the reactant side?
What is the
resulting value of AH2?
(Do not forget the unit)
c. What must be done to Reaction 3 to get one mole of HCN on the product side?
(Do not forget the unit)
What is the resulting value of AH3?
d. Calculate the AHoverall by doing a summation of the modified reactions 1-3.
(Do not forget the unit)
Life University
CHM 111
May
2021](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd19f3b21-fb4f-4e37-bd58-40b9ca0f2cef%2F65241007-4934-4e5c-8954-b3d1df617220%2Fuu7ifi_processed.jpeg&w=3840&q=75)
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