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The answers written with P are the expressions of the ratio of the reactants and products' partial pressures whereas those with brackets represent concentrations of the reactants and products. K values or Q values written with P are usually used for equations with gases while those written with concentrations are usually used for aqueous solutions.
Jina Kwon wrote:For question 5G11, why are some answers written with P and why are some answers written with brackets?
Hi! I just wanted to add another question to this same problem because I'm confused when looking at the answers. How do we know if they're asking for partial pressure or concentration? Is there a way to tell if they're asking specifically for pressure or concentration?
You would use partial pressure for equation with gases and concentration for equations in aqueous solution. Technically, writing the answer with concentration instead of partial pressure is the same thing I believe. But in problems where you have to solve for K, the problem would give you either concentration or partial pressure, so you would know when to use Kc or Kp.
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