Pressures and equilibriumz

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My chemistry is pretty rusty atm
Just 2 questions

1. In a contained of fixed volume, do pressures of various types of molecules add in scalar. E.g. if you have and then does ?


2. Also, say you have an equation , which is either an aqueous or gaseous reaction.

You start with 1 mol of A and 2 mol of B. mol of A reacts and the equilibrium constant is K

Then is the following correct:


A: mol
B: mol
C: 0


A: mol
B: mol
C: 0


A: mol
B: mol
C: mol




thanks...

[Edmund]

1. That's correct. The definition of Dalton's law of partial pressure: For a mixture of gases in a container, the total pressure exerted is the sum of the pressures that each gas would exert if it were alone.

2. Your n initial, reacting and equilibrium are right, but not the equilibrium expression.

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Thanks Edmund