Given the following bond energies : bond bond energy (kJ/mol) C=C 614 O=0 745 C=0 789 Choose. O-H 467 C-H 413 Calculate AH for the reaction : C,H, + 30, 2co, + 2H,0
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.
![Match each of the following with its correct answer
Given the following bond energies :
bond
bond energy (k]/mol)
C=C
614
O=0
745
C=0
789
Choose.
O-H
467
С-Н
413
Calculate AH for the reaction :
C,H, + 30,
+ 2co, + 2H,0
For the reaction:
C(graphite) + O2(9)
AH° = -11020 kJ/mol
2(9)
Choose...
Calculate the released heat (KJ/mol) from burning 0.30 g of C (graphite) ?
If AH°, of H,0 is -285.8 KJ/mol and AH°, of H,0 is -241.8 KJ/mol, then
the AH°, of condensation of H, 0 in ( KJ/mol) is :
(L)
2(g)
Choose...
A bomb calorimeter has a heat capacity of 2.47 kJ/°C. When a 0.105g of
ethylene ( C,H,) is burned in this calorimeter, temperature rose by 2.14°C. Find
the heat of combustion ( in kJ per mole) of C,H, (Mw = 28.05 g/mol)
Choose...
24.
If AH°, of H,0 is -285.8 KJ/mol and AH°, of H,0 is -241.8 KJ/mol, then
the AH°, of condensation of H,0 in ( KJ/mol) is :
(L)
6).
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