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Equipartition Theorem

18. Standard ...

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18. Standard free gibbs energies of formation at 298K are -237.2, 394.4 and 8.2 for H2O, CO2 and pentane respectively. The value of E^° for the pentan-oxygen fuel cell is 1) 0.0968V 2)1.968V 3) 2.0968V 4) 1.0968V

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Q. Standard free energies of formation(in

k J / m o l

298

- 237.2

- 394.4

- 8.2

H_{2} O (I), C O_{2} (g)

and pentane(g) respectively. The value of

E_{c e l l}^{o}

for the pentane-oxygen fuel cell is:

Q. Standard free energies of formation (in kJ/mol) at 298 K are -237.2, -394.4 and -8.2 for

H_{2} O (l), C O_{2} (g)

and pentane (g), respectively. The value of

E_{c e l l}^{0}

for the pentane-oxygen fuel cell is:

Q. The standard free energies of formation of

H_{2} O_{(l)}, {C O}_{2 (g)}

an n-pentane are

- 237.2 k J,

- 394.4 k J,

- 8.2 k J

. Then the value of

E^{0}

for pentane-oxygen fuel cell is:

Q. Show that the reaction,

C O (g) + \frac{1}{2} O_{2} (g) ⟶ C O_{2} (g)

300 K

is spontaneous and exothermic, when the standard entropy change is

- 0.094 k J {m o l}^{- 1} K^{- 1}

. The standard Gibbs free energies of formation for

{C O}_{2}

C O

- 394.4

- 137 k J {m o l}^{- 1}

Q. If a fuel cell, methanol is used as fuel and oxygen gas is used as an oxidiser. The reaction is

C H_{3} O H_{(l)} + \frac{3}{2} O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (g)

298 K

standard Gibb’s energies of formation for

C H_{3} O H (l), H_{2} O (l), and C O_{2} (g)

- 166.2, - 237.2

- 394.4 {kJ mol}^{- 1},

respectively. If the standard enthalpy of combustion of methanol is

- 726 {kJ mol}^{- 1}

, the efficiency of the fuel cell will be:

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