Q or K given both partial pressures and concentrations

[Brandon Ignacio 2J]

I've come across a couple of questions where it will give a mix of partial pressures and concentrations of molecules in a reaction (but not all of one or the other). For example, in the reaction A + B -> C say you were given the partial pressure of A and the concentrations of B and C. How would you go about finding Q/K for this problem?

[906112539]

I've come across a couple of questions where it will give a mix of partial pressures and concentrations of molecules in a reaction (but not all of one or the other). For example, in the reaction A + B -> C say you were given the partial pressure of A and the concentrations of B and C. How would you go about finding Q/K for this problem?

You would calculate Q/K the using partial pressure the same way you would calculate for Q/K with molar concentrations. K=[(PA)(PB)]/(C).

[Ashwin Babu 1I]

You could use the ideal gas law to convert partial pressure to concentration and vice versa. Concentration can be understood as n/V, so the ideal gas law is P = cRT where 'c' is concentration. To solve for partial pressure given concentration, use P = cRT, and to solve for concentration given partial pressure, use c = P/RT.