Canvas Question 24 Gold has a melting point Of 1338 K with AH°fus = 12.7 kJ/mol and boils at 3080 K with AH°vap = 310 kJ/mol. Given the specific-heat capacities (in J/g K) of Au(s), Au(I), and Au(g) are 0.131, 0.149, and 0.0632, respectively, how much heat (J) is requires to convert 2.15 g Au(s) at 1000 K to liquid at 1500K? 160. J Å 12.8 J O 81.1 J O 285 J Question 25 Which is the oxidizing agent in the reaction below? Cr₂O72- + 6 S₂032 + 14 H+ 2 Cr³+ + 3 S4062 +7 H₂O 0₂²- MacBook Pro ( 9 P
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.
![**Question 24**
Gold has a melting point of 1338 K with ΔH°_fus = 12.7 kJ/mol and boils at 3080 K with ΔH°_vap = 310 kJ/mol. Given the specific-heat capacities (in J/g K) of Au(s), Au(l), and Au(g) are 0.131, 0.149, and 0.0632, respectively, how much heat (J) is required to convert 2.15 g Au(s) at 1000 K to liquid at 1500 K?
- (A) 160 J
- (B) 12.8 J
- (C) 81.1 J
- (D) 285 J
**Question 25**
Which is the oxidizing agent in the reaction below?
\[ \text{Cr}_2\text{O}_7^{2-} + 6 \text{S}_2\text{O}_3^{2-} + 14 \text{H}^+ \rightarrow 2 \text{Cr}^{3+} + 3 \text{S}_4\text{O}_6^{2-} + 7 \text{H}_2\text{O} \]
- (A) Cr₂O₇²⁻](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F277ae00b-d056-42ed-a729-386f4fca5973%2F1759a378-ed83-4b65-8c0f-c3cdc5710d6b%2Fpm4e6si_processed.jpeg&w=3840&q=75)
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