Problem: Given the values of K shown below, determine the value of K for the reaction,N2(g) + 2 O2(g) <=> 2 NO2(g).N2(g) + O2(g) <=> 2 NO(g)      K = 25NO2(g) <=> NO + 1/2 O2(g)     K = 92Give your answer to the 4 decimal places.A. 209B. 0.0030C. 21160D. -21160

FREE Expert Solution

We are asked to calculate the K of the reaction below. 


N2(g) + 2 O2(g) ↔  2 NO2(g)


To calculate the K of the reaction equation, we’re going to use Hess’s Law. We’re going to manipulate the 3 reactions with given K values such that when we add them together, we will get the reaction equation with the unknown K.

Given reactions:

Unknown Kvalue:      N2(g) + 2 O2(g)   2 NO2(g)                            K = ?

Reaction 1:                    N2(g) + O2(g) 2 NO(g)                                   K1 = 25

Reaction 2:                    NO2(g) ⇌ NO + 1/2 O2(g)                                 K2 = 92


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Problem Details

Given the values of K shown below, determine the value of K for the reaction,

N2(g) + 2 O2(g) <=> 2 NO2(g).

N2(g) + O2(g) <=> 2 NO(g)      K = 25

NO2(g) <=> NO + 1/2 O2(g)     K = 92

Give your answer to the 4 decimal places.


A. 209

B. 0.0030

C. 21160

D. -21160