Acetic acid and water react to form hydronium cation and acetate anion, like this: HCH3CO2(aq) + H2O → H3O+(l)(aq) + CH3CO2^-(aq)

Imagine 226 mmol of CH3CO2- are added to a flask containing a mixture of HCH3CO2, H2O, H3O + and CH3CO2- at equilibrium.

Required:
What is the rate of the reverse reaction before any CH3CO2^- has t:een added to the flask?

The rate of the reverse reaction before any addition of CH3CO2- is zero

Explanation:

When the reaction is in equilibrium:

HCH3CO2(aq) + H2O ⇄ H3O+(l)(aq) + CH3CO2^-(aq)

The reaction quotient, Q = Ka and no more products or reactants are produced because their concentrations are in the right proportion.

Now, as no reaction occurs,

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements