Go = 775 kJ for the vaporization of boron carbide: B4C (s) = 4 B (g) + C (s) Fin

Question

Go = 775 kJ for the vaporization of boron carbide:
B4C (s) = 4 B (g) + C (s)
Find G and determine if the process is spontaneous if the reaction vessel contains 4.00 mol B4C(s), 0.400 mol of C(s), and B(g) at a partial pressure of 1.0 x 10-5 atm. At 2600 K, R T = 21.6 kJ. Go = 775 kJ for the vaporization of boron carbide:
B4C (s) = 4 B (g) + C (s)
Find G and determine if the process is spontaneous if the reaction vessel contains 4.00 mol B4C(s), 0.400 mol of C(s), and B(g) at a partial pressure of 1.0 x 10-5 atm. At 2600 K, R T = 21.6 kJ. Go = 775 kJ for the vaporization of boron carbide:
B4C (s) = 4 B (g) + C (s)
Find G and determine if the process is spontaneous if the reaction vessel contains 4.00 mol B4C(s), 0.400 mol of C(s), and B(g) at a partial pressure of 1.0 x 10-5 atm. At 2600 K, R T = 21.6 kJ.

Explanation / Answer

Q = ( p B )^4

= (1.0 x 10-5)^4

Q = 10^-20

G = G^o+RT*ln(Q)

= 775*1000+21.6*1000 ln( 10^-20)

= -269.45KJ

process is spontaneous as G is negative.

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