partial pressure question

[Smooth Operater]

---

Members don't see this ad.

when heated, solid mercury oxide decomposes into gaseous mercury and oxygen gas, reaching equilibirum at a temperature of 740K and pressure of 15 atm, as the following rxn equation shows

2HgO (s) + heat ---> 2Hg (g) + O2 (g)


At equilibrium, the partial pressure would be pHg(g) : pO2(g) ??


the correct answer is 1 atm: 0.5 atm .

But I am not sure how to derive to this answer. I first throught it's 2:1 since the mole ratio of Hg and O2 is 2:1. Anyone know how to solve it correctly?

 

[allstardentist]

seems like they are asking for pressure ratio. So I think what u said is also correct (2:1). any multiples of ratio 2:1 should be correct.

 

[Smooth Operater]

would partial ratio be 2/3 : 1/3 ?

 

[DATexamnextweek]

you got it right. the molar ratio is 2:1. thus the ratio of partial pressure is 1 to .05

 

[Smooth Operater]

thanks, but how would you convert molar ratio into partial gas ratio?