In reaction 2, if we had used 4 grams of NaOH instead of 2 grams, would the heat gained by the solution [#6] have been larger, smaller or the same? Briefly explain.
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.
![Reaction 1
Reaction 2
Reaction 3
NTHALPY OF REACTION for THREE REACTIONS
1.9886 g
2.0193g
Mass of solid NaOH(g)
Record M and V
100 g
2.9886 g
2.5193 g
Mass of total solution (g)
20,77 c
20.74 c
21.00 c
B.
Initial temperature (°C)
25.59 c
30.33 c
27.91 c
4.
Final temperature (°C)
4.82 c
9.95 c
6.91 c
5. Change in temperature, AT ('C)
0.0602 kj
0.10108kj
2.891144kj
6. Heat gained by solution, q (kJ)
40.103 j
81.023 j
2.9j
7.
Moles of NaOH consumed (mol)
-0.0015kj
-0.001246kj
-0.99693kj
8. Enthalpy of reaction, AH (kJ/mol)
ΔΗ
AH,
ΔΗ
HESSÆS LAW CALCULATION FOR REACTION 2:
-0.001246
9.
Accepted Value for AH, [# 8]
0.00124404
10. Experimental Value for AH; [AH,+AH;]
1.99842
11. Percent Error
Sample Calculations:
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