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I have tried doing this so many times I cant get it ..please explain every step

ID: 819826 • Letter: I

Question

I have tried doing this so many times I cant get it ..please explain every step please thank you!!


I have set up my ICE table but I am stuck at the part where they give you the equilibrium concentration ahead of time, its messing up my calculations.


Q:  Calculate the concentration of NO at equilibrium for the following reaction if the initial concentration of NO is 0.150 M and bromine is 0.100 M. The equilibrium concentration of bromine was determined to be 0.0352 M.


A. 0.020 M

B. 0.073 M

C. 0.065 M

D. 0.080 M

E. 0.115 M

Explanation / Answer

2NO(g ) + Br2(g) ? 2NOBr(g )


change in constration

-2x -x +2x


remaining conc

0.150-2x 0.100-x 2x


here

0.100-x=0.0352

x=0.0648


now eq conc of NO

0.150-2*0.0648

=0.0204