Balanced equation for Acetic Acid?

CH3OH(aq) + CO(g) ---> CH3COOH(aq)

The chemistry is OK, acetic acid is most commonly produce by the carbonylation of methanol. The mass balance is fine. Perhaps you should consider this as the reaction between CO gas and anhydrous methanol to make glacial acetic acid.

CH3OH(l) + CO(g) --> CH3COOH(l)

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Combustion???? Not really. We generally think of combustion as the rapid oxidation of a substance in O2, and the products of complete combustion are CO2 and water vapor.

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The complete combustion of acetic acid is ....

CH3COOH(l) + 2O2(g) --> 2CO2(g) + 2H2O(g)

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You wrote,

"Got it wrong. The answer was..

C2H4O2(l) + 2O2(g) ---> 2CO2(g) + 2H2O(g)"

Who got it wrong? You? You had it fouled up from the beginning, but I didn't get it wrong. CH3COOH is the formula for acetic acid. C2H4O2 is the generic molecular formula for ACETIC ACID, but it surely doesn't say, "acetic acid", like CH3COOH does.

Acetic Acid Chemical Equation

A combustion reaction is whatever compound reacted with oxygen to produce water and carbon dioxide. The CORRECT balanced equation (including phases), is as follows:

CH3COOH(l)+2O2(g)> 2CO2(g)+2H2O(g)

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Nitric acid is stronger than acetic acid : CH3COOH + HNO3 >> NO3- + CH3COOH2+

C2H4O2(l)+2O2(g)-->2CO2(g)+2H2O(g)

Final answer. Pay attention that water is a gas in the products side.

Need more info. what is the given part of the question?

HNO3 + CH3COOH <------> (NO3)- + (CH3COOH2)+