Forward and reverse rate constants for the reaction CO2 (g) + N2 (g)eq CO (g) +
ID: 957544 • Letter: F
Question
Forward and reverse rate constants for the reaction CO2 (g) + N2 (g)eq CO (g) + N2O (g)
exhibit the following temperature dependance:
Temperature (K) kfwd (M-1•s-1)
krev (M-1•s-1)
1200 9.1 x 10-11 1.5 x 10-5
1300 2.7 x 10-9 2.6 x 10-5 Is the reaction endothermic or exothermic? Explain in terms of kinetics.
a. Endothermic, because the forward rate is faster at higher temperatures.
b. Exothermic, because the forward rate is faster at higher temperatures.
c. Endothermic, because the reverse rate is faster at higher temperatures.
d. Exothermic, because the reverse rate is faster at higher temperatures.
e. Endothermic, because higher temperatures cause the forward rate to speed up more than the reverse rate.
f. Exothermic, because higher temperatures cause the forward rate to speed up more than the reverse rate.
g. Endothermic, because the reverse rate is significantly faster than the forward rate.
h. Exothermic, because the reverse rate is significantly faster than the forward rate.
Explanation / Answer
a. Endothermic, because the forward rate is faster at higher temperatures.
On increasing temperature rate of farword reaction increases and thus the Equilibrium constant. Hence the reaction is endothermic in nature.