For complete combustion of ethene,
C 2 H 4 ( g) + 3O 2 ( g) 
2 CO 2 ( g) + 2H 2 O(a)
the amount of heat produced as measured in bomb calorimeter is 1406 kJ mol -1 at 300 K. The minimum value of T 
S needed to reach equilibrium is (-) kJ.
(Nearest integer)
Given: R = 8. 3 J K -l mol -1
Text Solution
Verified by Experts1411
(1411) C 2 H 4 ( g) + 3O 2 (g) 
2 CO 2 ( g) + 2H 2 O(a)
U = -1406 kJ mol -1
T = 300K
H = 
U + 
n g RT
U is the change in the internal energy of the system, which is the sum of the kinetic and potential energies of all the molecules in the system. R is the gas constant (8. 314 J/(mol K) and T is the temperature in Kelvin.
H = -1406 + (-2) x 8.3 x 300 = -1406- 4.98
= -1410.98 KJ mol -1 
-1411
The minimum value of T A S at equilibrium 
H
H = T 
S = -1411 KJ mol -1
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