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Question

Chemistry Question on Equilibrium

At equilibrium the concentrations of N2=3.0×10−3M,O2=4.2×10−3M and NO=2.8×10−3M in a sealed vessel at 800 K. What will be KC for the reaction N2( g)+O2( g)⇋2NO(g)?

A

(A) 0.622

B

(B) 0.722

C

(C) 0.822

D

(D) 0.922

Answer

(A) 0.622

Explanation

Solution

Explanation:
We are given,N2=3.0×10−3MO2=4.2×10−3MNO=2.8×10−3MApplying the law of chemical equilibrium, we will get -KC=[NO]2[ N2][O2]⋯(1)Adding the values in equation 1 ,KC=[2.8×10−3M][3.0×10−3M][4.2×10−3M]=0.622The value of KC is 0.622Hence, the correct option is (A).