Using the enthalpies of reaction computed in the data and the value give for the enthalpy of formation of liquid water, show the Hess law determination of the enthalpy of formation of solid magnesium oxide
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.
![Use the following to determine the enthalpy of formation of magnesium oxide:
Mg (s) + 2HCI (aq) → MgCl2 (aq)+ H2 (g)
AH= (calculated in the experiment)
Mg0 (s) + 2HC (aq) → MgCl2 (aq)+ H20 (1)
AH= (calculated in the experiment)
AH=- 285.8 kJ/mol (from Appendix 3)
H2 (g) + ½ 02 (g)→ H20 (1)
AH = (determine using Hess's Law)
Mg (s) + ½ 02 (g) → Mg0 (s)
MAY
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![Reactant
Mg
Mg
MgO
MgO
Trial Number
1
3
एडाउफ०००
4
0ス533
02540
Mass of reactant
0.505 6
Data from graph
34.0c 33.1
Initial Temp (to)
23.7°c 31.8
63.0 sec
35-5
Initial Time (To)
36.5 Sec
36.5 sec 34.0 Sc
0.005547
Linear Curve fit slope (m)
-0.006o22-0o.o10 18
Linear Curve fit intercept (b) 3. 44.959-38.01
37.05
otes:
Room temp
23.7°C](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff5bd1a27-e559-4abd-b158-898799f60d66%2F42be5fe5-2a62-4522-b032-2fb433988d0f%2Fkl0nvhh_processed.jpeg&w=3840&q=75)
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