Why do most chemical reactions occur at constant pressure?
Answer:
Most chemical reactions do not occur at constant pressure in reality. However, for the sake of making calculations, you generally assume constant pressure. Large changes in pressure can affect the reaction, but generally if there any fluctuations in pressure, they are too nominal to affect the calculations beyond the significant figures you are using for the calculations.
That's b/c most reactions (at least the ones you're talking about) are performed in vessels open to the atmosphere. So they're all done under atmospheric pressure. Any pressure changes caused by the reaction are dissipated into the air.
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