2011 midterm q4

[Miya Eberlein 1J]

i was just wondering, when solving for K, why the product concentration is 2x and not just x? thank you!

[Jamlah Dalie 1K]

It's because since it says the partial pressures for each of the reactants is equal to half that of the product, you'd have a one half in the denominator multiplied to the reactants so it's the same as multiplying the numerator by 2, by rules of fractions.

[Taylor Pio 3H]

I'm confused on why 2x is not the top. Wouldn't each reactant have a 1/2 in front of it? And then wouldn't you bring a 4 to the top instead of a two?

[Jamlah Dalie 1K]

Well you would put the 1/2 on the outside and it would distribute to each reactant, if that makes sense, rather than each having a separate 1/2 and it distributing to the top as 4.