A student performs the Kea of Iron(III) Thiocyanate experiment, and obtains the following data set: Volume Fe³+, mL 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 Sample Blank S2 S3 S4 S5 S6 S7 S8 S9 S10 [Fe³+], M The balanced chemical reaction is: Volume SCN', mL 0.000 0.025 0.050 0.075 0.100 0.125 0.150 0.175 0.200 0.225 [SCN-], M Absorbance 0.000 0.097 0.214 0.313 0.408 0.509 0.599 0.688 0.771 0.858 Fe³+ (aq) + SCN- (aq) = FeNCS²+ (aq) 1: The stock solutions used had concentrations of 0.200 M Fe³+ and 2.00x10-³ M SCN. Calculate the concentrations of Fe³+ and SCN in each sample after they are mixed.
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.
![A student performs the Kea of Iron (III) Thiocyanate experiment, and obtains the following data set:
Volume Fe³+,
mL
[SCN-], M
2.000
2.000
2.000
2.000
2.000
2.000
2.000
2.000
2.000
2.000
Sample
Blank
S2
S3
S4
S5
S6
S7
S8
S9
S10
[Fe³+], M
The balanced chemical reaction is:
Volume SCN',
mL
0.000
0.025
0.050
0.075
0.100
0.125
0.150
0.175
0.200
0.225
3+
Fe³+ (aq) + SCN¯(aq) = FeNCS²+ (aq)
Absorbance
0.000
0.097
0.214
0.313
0.408
0.509
0.599
0.688
0.771
0.858
1: The stock solutions used had concentrations of 0.200 M Fe³+ and 2.00x10-³ M SCN. Calculate the
concentrations of Fe³+ and SCN in each sample after they are mixed.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdee8ae33-4eca-4bcd-9517-a19806391164%2Ff21052e5-4afe-4e4a-9426-ca6838d7756c%2F03av4ma_processed.jpeg&w=3840&q=75)
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