The standard heat of formation, Af Hº, is defined as the enthalpy change for the formation of one mole of substance from its constituent elements in their standard states. Thus, elements in their standard states have Af H° =0. Heat of formation values can be used to calculate the enthalpy change of any reaction. Part A For which of the following reactions is A, H° equal to Af H° of the product(s)? Consider, for example, the reaction You do not need to look up any values to answer this question. 2NO(9) + Oz(9) = 2NO2(9) Check all that apply. with heat of formation values given by the following table: Substance > View Available Hint(s) (kJ mol ) NO(9) O Li(s) + ¿F2(9)→LIF(s) 90.2 02(9) O CaCO3(9)¬CaO + CO2(9) NO2(9) 33.2 O CO(9) + ÷O2(9)→CO2(9) O 2Li(s) + F2(9)→2LIF(s) O (s) + O2(9)→CO2(9) Then the heat of formation for the overall reaction is Δ,Η Σπ, Δι Η ' (prodcts)-ΣnΔι Η' (reactants) = 2(33.2) [2(90.2) + 0] O Li(s) + ¿F2(1)→LIF(s) 114 kJ mol
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.
![II Review | Constants | Perio
The standard heat of formation, Af H°, is defined as the enthalpy
change for the formation of one mole of substance from its constituent
elements in their standard states. Thus, elements in their standard
states have Af H° = 0. Heat of formation values can be used to
calculate the enthalpy change of any reaction.
Part A
For which of the following reactions is A,H° equal to Af H° of the product(s)?
Consider, for example, the reaction
You do not need to look up any values to answer this question.
2NO(9) + O2(9)= 2NO2(9)
Check all that apply.
with heat of formation values given by the following table:
• View Available Hint(s)
Af H°
(kJ mol 1
Substance
NO(9)
O Li(s) + F2(9)→LİF(s)
90.2
02 (9)
O CACO3 (9)→CaO+CO2(9)
NO2(9)
33.2
O CO(g) +O2(9)→CO2(g)
O 2Li(s) + F2(9)→2LİF(s)
Then the heat of formation for the overall reaction is
Δ.Η-Σ n, Δ; Η' (products) -ΣηΔ Η (reactants )
O C(s) + O2(9)→CO2(g)
= 2(33.2)
[2(90.2) + 0]
O Li(s) + ¿F2(1)→LİF(s)
-114 kJ mol 1](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F29f5e4a7-fd1d-4e98-ad3e-4aec8e82e6b8%2Fd64a79b0-b5f1-45a0-bac7-23d278d2fce4%2Fs4rqoxe_processed.png&w=3840&q=75)
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