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  3. the generic reaction 2a?b has the following rate l

The generic reaction 2A?B has the following rate laws: forward reaction:reverse reaction:rate=kf[A]2rate=kr[B] where kf is the rate constant for the...

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Chemistry

The generic reaction

2A?B

has the following rate laws:

forward reaction:reversereaction:rate=kf[A]2rate=kr[B]

where kf is the rate constant for the forward reactionand kr is the rate constant for the reverse reaction. Atequilibrium, the two rates are equal and sokf[A]2=kr[B]. The equilibrium constant for areaction is related by the law of mass action to the rate constantsfor the forward and reverse reactions:

Kc=[B][A]2=kfkr

Formation of nitrosyl bromide

Nitrosyl bromide, NOBr, is formed in the reaction of nitricoxide, NO, with bromine, Br2:

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

The reaction rapidly establishes equilibrium when the reactantsare mixed.

A.

At a certain temperature the concentration of NO was 0.400M and that of Br2 was 0.265M . At equilibrium theconcentration of NOBr was found to be 0.250 M. What is thevalue of Kc at this temperature?

Express your answer numerically.

Answer & Explanation Solved by verified expert
3.7 Ratings (413 Votes)
2NOg Br2g 2NOBrgInitialconcM040002650ChangeM2aa2aEqub    See Answer
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