The Student Room Group

Chem equilibrium Q!

2SO2(g)+O2(g) <=> 2SO3(g)

In a vessel of volume 1.80 dm, this equilibrium contains 0.0700 mol of SO3(g), 0.0500 mol of SO2(g) and 0.0900 mol of O2(g) at a total pressure of 623 kPa. The temperature in the equilibrium vessel is

A: 596K

But how on earth was I supposed to work that out?
Thanks all!!
(edited 1 year ago)
4D10DBD7-3348-4A61-AF36-A285AD3B86C0.jpegHi I just tried out the question and I’m convinced it’s 642.6K using the ideal gas equation I have no idea how to get 596 at all, it’s not like you can really use partial pressures or anything. This was my working out :/
Original post by panicatthetardis
4D10DBD7-3348-4A61-AF36-A285AD3B86C0.jpegHi I just tried out the question and I’m convinced it’s 642.6K using the ideal gas equation I have no idea how to get 596 at all, it’s not like you can really use partial pressures or anything. This was my working out :/

Strange, just double checked mark scheme. Ill have another go and if still no luck ill email my all-knowing (but scary) chem teacher and let you know what he says!
Original post by uhhhh6678987654
Strange, just double checked mark scheme. Ill have another go and if still no luck ill email my all-knowing (but scary) chem teacher and let you know what he says!

Depending on what value you use for R you deffo get an answer of 642 and a bit.
Original post by Pigster
Depending on what value you use for R you deffo get an answer of 642 and a bit.


yeah that was option D as well so its gotta be an error in the markscheme

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