1. The value of delta G at 25 degrees C for the following reaction, C2H4(g)+H2(g

Question

1. The value of delta G at 25 degrees C for the following reaction, C2H4(g)+H2(g)-->C2H6(g), is _________kJ/mol. At 298K, delta H for this reaction is -137.5 kJ/mol, and delta S is +120.5 J/K.
A. -35800
B. -173.4
C. 35800
D. -101.7
E. -274.2

2. Delta S is positive for the reaction _______.
A. Pb(NO3)2(aq) + 2KI9aq) --> PbI(s) + 2KNO3(aq)
B. 2H2)(g) --> 2H2(g) + O2(g)
C. H2O(g) --> H2O(s)
D. NO9g) + O2(g) --> NO2(g)
E. Ag+(aq) + Cl-(aq) --> AgCl(s)

3. Which of the following statements is true?
A. Processes that are spontaneous in one direction are spontaneous in the opposite direction.
B. Processes are spontaneous because they occur at an observable rate.
C. Spontaneity can depend on the temperature.
D. All of the statements are true.

4. The thermodynamic quantity that expresses the degree of disorder in a system is _______.
A. Enthalpy
B. Internal Energy
C. Bond Energy
D. Entropy
E. Heat flow

Explanation / Answer

1) Use theis formula to solve for delta G: delta G = delta H - T * delta S delta H = -137.5 kJ/mol = -137,500 J/mol T = 298 K delta S = 120.5 J/K delta G = delta H - T * delta S delta G = -137,500 J/mol - (298 K)(120.5 J/K) delta G = -173,409 J/mol = -173.4 kJ/mol The correct answer is B. 2) An increase in entropy, meaning an increase in disorder, results in a positive value for delta S (S>0) A decrease in entropy, meaning a decrease in disorder, results in a negative value for delta S (S

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.