Write the mass-action expression, 
c, for the following chemical reaction. NO(g) + ½Br2(g) 
NOBr(g)
Definitions:
β-Ketoester
An ester compound containing a ketone group (C=O) at the beta-position relative to the ester group.
Claisen Condensation
A chemical reaction where two esters or an ester and a carbonyl compound react in the presence of a base to form a β-keto ester or a β-diketone.
Ester Enolate
A reactive intermediate formed from the deprotonation of an ester, used in various organic synthesis reactions.
pKa
A quantitative measure of the strength of an acid in solution, representing the acid dissociation constant on a logarithmic scale.
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