Chemistry connundrum

citizenerased1

Howaye lads!
so Le chat's principle tomorrow?
heres a tough one i'm on if someone can shed light

2HI--->H2 + I2

two moles of hydrogen Iodide placed in a vessel Kc is .0156
calculate number of moles of hydrogen iodide present

i'm usually fairly good at these but this ones a toughie i wrote down

2-2x---->x x

then got Kc as [x]^2 over (2-2x)^2 is equal to .0156


looks dodgy?:eek:

Killio9

citizenerased1 wrote: »

Howaye lads!
so Le chat's principle tomorrow?
heres a tough one i'm on if someone can shed light

2HI--->H2 + I2

two moles of hydrogen Iodide placed in a vessel Kc is .0156
calculate number of moles of hydrogen iodide present

i'm usually fairly good at these but this ones a toughie i wrote down

2-2x---->x x

then got Kc as [x]^2 over (2-2x)^2 is equal to .0156


looks dodgy?:eek:

not very good at this,but cancel the square roots get the square root of .0156 and then cross multiply?

citizenerased1

cool thats what i did

gets very messy though doesn't it!!

Killio9

yeah i don't know at all what to do,bit ridiculous that Kc is .0156 haha!

citizenerased1

its the DEB pre question i got a massive 4 out of 50 on the whole question :P:P

greenbetty69

havent even got as far as that one yet! could anyone tell me what the results of the reaction of ethanoic acid with sodium hydroxide, sodium carbonate & magnesium are because i didnt do the experiment and havent a clue what happens lol!