Standard free energies of formation for use in problems that follow: Based on va

Question

Standard free energies of formation for use in problems that follow:

Based on values in the preceding table, what is the standard free energy change for the reaction C6H12O6(s) 2CO2(g) + 2CH3CH2OH(l)?

options: a) -221.1 kJ/mol b) -208.5 kJ/mol c) 348.0 kJ/mol d) 173.3 kJ/mol

Question 2.

Which of the following substances has the least entropy?

options:

Fe(s)

B(s)

He(g)

H2(l)

Thank you!

Compound G°f Compound G°f CO(g) -137.2 H2O(g) -228.572 CO2(g) -394.359 H2O(l) -237.129 C2H2(g) 209.2 CaC2(s) -64.9 C2H4(g) 68.12 Ca(OH)2(s) -898.6 CH3CH2OH(g) -168.49 CaO -604.0 CH3CH2OH(l) -174.78 CaCO3 -1128 C6H12O6 -917.2

Explanation / Answer

1)

Gorxn = Gof (products) - Gof(reactants)

Gorxn = 2*Gof (CO2) + 2*Gof(CH3CH2OH) - Gof(C6H12O6)

= 2*(-394.359) + 2* (-168.49) - (-917.2)

= -208.5 KJ/mol

Answer: b

2)

Entropy is least for solid

Fe and B are both solid

For same phase, the one with lower molar mass has lesser entropy

so, B will have least entropy

Answer: b ) B (s)

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

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