2) Substance kJ/mol Substance kJ/mol Standard molar enthalpies of formation of some substances, CO(g) CO2(g) CH4(g) CH2(g) CH4(g) CH6(g) C3Hs(g) CH10(g) CH-ОН(1) -238.7 С-Н-ОН(1)-277.7 HF(g) HCI(g) -110.5 -393.5 -36.40 26.48 -241.8 HBr(g) HI(g) H,O(g) H2O(1) H2S(g) NH3(g) NO(g) N20(g) NO2(g) N2O4(g) SO2(g) SO:(g) AH°, at 298 K are given on the left. The complete combustion of ethanol, (C2HSOH(), yields CO2(g) and H20(). Using the data given on the left, calculate the heat produced in the combustion of 4 g of ethanol, C2HSOH(I), at room temperature. (С-Н.ОН: 46.0 g/mol, Hint: First write and balance the combustion reaction). -74.81 -285.8 -20.63 226.7 52.26 -84.68 -103.8 -125.6 -46.11 90.25 82.05 33.18 9.16 -296.8 -395.7 -271.1 -92.31 aValues are for reactions in which one mole of substance is formed.
2) Substance kJ/mol Substance kJ/mol Standard molar enthalpies of formation of some substances, CO(g) CO2(g) CH4(g) CH2(g) CH4(g) CH6(g) C3Hs(g) CH10(g) CH-ОН(1) -238.7 С-Н-ОН(1)-277.7 HF(g) HCI(g) -110.5 -393.5 -36.40 26.48 -241.8 HBr(g) HI(g) H,O(g) H2O(1) H2S(g) NH3(g) NO(g) N20(g) NO2(g) N2O4(g) SO2(g) SO:(g) AH°, at 298 K are given on the left. The complete combustion of ethanol, (C2HSOH(), yields CO2(g) and H20(). Using the data given on the left, calculate the heat produced in the combustion of 4 g of ethanol, C2HSOH(I), at room temperature. (С-Н.ОН: 46.0 g/mol, Hint: First write and balance the combustion reaction). -74.81 -285.8 -20.63 226.7 52.26 -84.68 -103.8 -125.6 -46.11 90.25 82.05 33.18 9.16 -296.8 -395.7 -271.1 -92.31 aValues are for reactions in which one mole of substance is formed.
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Chapter5: Thermochemistry
Section: Chapter Questions
Problem 17E: Would the amount of heat absorbed by the dissolution in Example 5.6 appear greater, lesser, or...
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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:2)
Substance kJ/mol
Substance kJ/mola
Standard
molar
enthalpies of
formation of some substances,
AH°, at 298 K are given on the left.
The
CO(g)
CO2(g)
CH4(g)
CH2(g)
CH4(g)
CH6(g)
C3Hs(g)
CH10(g)
CН:ОН (1) —238.7
СН-ОН(1) -277.7
HF(g)
HCI(g)
-110.5
-393.5
HBr(g)
HI(g)
H20(g)
H2O(1)
H,S(g)
NH3(g)
NO(g)
N20(g)
NO2(g)
N2O,(g)
SO-(g)
So;(g)
-36.40
26.48
-241.8
-74.81
complete combustion of
ethanol, (C2H$OH(I), yields CO2(g)
and H20(1).
Using the data given on the left,
calculate the heat produced in the
combustion of 4 g of ethanol,
C2H$OH(I), at room temperature.
(CH;OH: 46.0 g/mol,
Hint: First write and balance the
combustion reaction).
226.7
-285.8
-20.63
52.26
-84.68
-46.11
-103.8
-125.6
90.25
82.05
33.18
9.16
-296.8
-395.7
-271.1
-92.31
aValues are for reactions in which one mole of substance is formed.
AK
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