Please help me in this chemistry mcq plz

[angelgurl]

 

[angelgurl]

source: nov 2010 paper 11
ans: B
please explain the working i tried it at least 5 times but couldnt figure out how to get the moles

 

[hassam]

its a repeat q.....draw up an ICE table
ETHANOL ACID ESTER WATER
I 1 1 0 0
C -X -X +X +X
E 1-X 1-X X X

Kc=x^2/(1-x)^2 =4.......solve it now

 

[angelgurl]

shouldnt it be 1+x rather than x on the right hand side thats what confuses me.

 

[hassam]

no cos....initial moles of ester and water were 0

 

[angelgurl]

didnt understand
ive seen many calculations they always involve -X on the right hand side frm the initial conc even when the initial moles are zero
when do we use 1-X and when do we use x?

 

[angelgurl]

pls help hassam

 

[angelgurl]

i wud hv hit the thans button but after wht happened with zahraahmed im scared abt doing this!

 

[Nibz]

This is sheer idiocy!
Why don't you guys forget that drama!

 

[BILALrox01]

This is sheer idiocy!
Why don't you guys forget that drama!

Haaha.. totally agree with you.. Not thanking cuz u think u might get blocked.. uff

 

[angelgurl]

nibz dear can u help me in this mcq please!!
ive seen many calculations they always involve -X on the right hand side frm the initial conc even when the initial moles are zero
when do we use 1-X and when do we use x?