The undesirable (pollution-forming) reaction below occurs at the high temperatur

Question

The undesirable (pollution-forming) reaction below occurs at the high temperature of many combustion reactions. At a temperature of 1500 K, the equilibrium constant K for this reaction is 1.0 x 10^-5. Earth?s atmosphere is often approximated to have [N2] = 0.80 M and [02] = 0.20 M. Based on these concentrations, what concentration of the pollutant NO is expected when the reaction below equilibrates at 1500 K? N2(g) + 02(g) 2 NO(g) A. 2.0x10^-3M B. 1.3 x 10-3 M C. 2.0x10^-4 M D. 4.0x10^-7 M E. None of the above

Explanation / Answer

option B 1.3 x10^-3 M

equilibrium constant

Kc = [NO]2/[N2][O2]  

in the problem [N2]= 0.8M    [O2] = 0.2M   and Kc = 1.0 x10^-5 are given .

if we substitute all values in above equation

1.0 x10^-5 = [NO]2/ 0.8 x 0.2

[NO]= 1.3 x10^-3 M

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