States of Matter In Chemical Equations

[Christine Pahel 1C]

In a chemical reaction where the byproduct is CO2, is the CO2 always in a gaseous state?

[Annie Qing 2F]

I believe since the boiling point for is -78.5°C and reactions generally occur above that temperature, is usually found as a gas.
If by some chance the reaction occurred under -78.5˚C, I think would be found as a solid (because sublimates) under normal pressure circumstances. Under rare circumstances, it may be found as a liquid.

[Christopher Lew 1L]

Annie is correct. For most chemical reactions, correct me if i'm wrong, but we assume that they are taking place under room temperature unless stated otherwise. The question will have to specifically tell you that the reaction is being performed under a specific condition. So, we just assume that the reaction is happening under room temperature and 1 atm. As for this class, I don't think you have to put the states of matter unless told to do so.