Alkoxides R-O- can be used to synthesize alkenes as exemplified by the reaction shov below, where the symbol (et) indicates that the substance is dissolved in ethanol (CH;CH,OH) used as solvent: Br (1) HO, Br(et) (et) (g) + + (et) CH,CH,OH + t-but-Br Ethoxide Isobutylene 10. What is the value of the rate constant for the synthesis of isobutylene at 25 °C? Initial Rate (M/s) [isobutylene] а) 6.8 х10-8 Trial Initial Initial [t-but-Br] [Ethoxide] b) 8.5 x10-7 6.8 x 10-8 13.6 x 10-8 1 0.08 M 0.04 M c) 2.1 x 10-5 0.16 M 0.04 M 6.8 x 10-8 13.6 x 10-8 d) 1.1 x10-5 3 0.08 M 0.08 M 4 0.16 M 0.08 M
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.
![Alkoxides R-O can be used to synthesize alkenes as exemplified by the reaction shov
below, where the symbol (et) indicates that the substance is dissolved in ethanol
(CH,CH,OH) used as solvent:
Br
+
(1)
Br(et)
(et)
+
(et)
CH,CH,OH
+
t-but-Br
Ethoxide
Isobutylene
10. What is the value of the rate constant for the synthesis of isobutylene at 25 °C?
а) 6.8 х10-8
Trial
Initial
Initial
Initial Rate (M/s)
[t-but-Br]
[Ethoxide]
[isobutylene]
b) 8.5 x10-7
6.8 x 10-8
13.6 х 10-8
1
0.08 M
0.04 M
c) 2.1 x 10-5
0.16 M
0.04 M
0.08 M
0.08 M
6.8 x 10-8
13.6 x 10-8
d) 1.1 x10-5
3
0.08 M
4
0.16 M](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F520aeab9-34ec-4c74-b2c1-7a75d6f30636%2Ff523a7c6-460b-44ed-8b64-65f1781eaadd%2Fj8i08pi_processed.png&w=3840&q=75)
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