Sucrose (C12H22O11), which is commonly known as table sugar, reacts in dilute acid solutions to form two simpler sugars, glucose and fructose, both of which have the formula C6H12O6: C12H22O11 (aq) + H2O (l) → C6H12O6 (aq) + C6H12O6 (aq) Sucrose Glucose Fructose At 23 o C and in a 0.5 M HCl, the following data were obtained for the disappearance of sucrose Time (min) [C12H22O11] (M) 0 0.316 39 0.274 80 0.238 140 0.19 210 0.146 Is this reaction first order or second order? What is the value of the rate constant?
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.
- Sucrose (C12H22O11), which is commonly known as table sugar, reacts in dilute acid solutions to form two simpler sugars, glucose and fructose, both of which have the formula C6H12O6:
C12H22O11 (aq) + H2O (l) → C6H12O6 (aq) + C6H12O6 (aq)
Sucrose Glucose Fructose
At 23 o C and in a 0.5 M HCl, the following data were obtained for the disappearance of sucrose
|
Time (min) |
[C12H22O11] (M) |
|
0 |
0.316 |
|
39 |
0.274 |
|
80 |
0.238 |
|
140 |
0.19 |
|
210 |
0.146 |
- Is this reaction first order or second order?
- What is the value of the rate constant?
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