[be7cailay]

Hello guys, I don't know my solution is right or wrong. Please correct me! thank you very much

Problem:
Ordinary white phosphorus, P4, forms a vapor which dissociates into diatomic molecules at high temperatures:   P4(g)→ 2 P2(g)

A sample of white phosphorus, when heated to 1000°C, formed a vapor having a total pressure of 0.20 atm and a density of 0.152 g L–1. Use this information to evaluate the equilibrium constant Kp for this reaction.

[be7cailay]

Oh! I just realize that the density part is wrong 

[magician4]

the average density [itex]\rho_{av}[/itex] of a gas mixture of A , B is to be calculated as follows:

[tex] \rho_{av} \ = \ \chi (A) \cdot \rho_{pure}(A) \ + \ \chi (B) \cdot \rho_{pure}(B) [/tex]


besides that, your thoughts as represented by the paper are a little hard to follow, but seem ok to me

nevertheless, you should keep in mind that the final dimension of your K_p should be [atm] in this case: the result is not a scalar (as shown)

regards

Ingo

[be7cailay]

Thank you very much for the density formula, Ingo!!