x Turn on thread page Beta
 You are Here: Home

KC Calculation problem watch

1. So I'm basically working through some questions out if the text book and I'm not sure why i'm wrong

The question is
0.4 mil of H2 and 0.3 mol of I2 were mixed in a 2dm3 flask and allowed to reach equilibrium. The equilibrium mixture contained 0.2 mil of HI. Deduce the amount of h2 and i2 in the equilibrium mixture and calculus kc for h2(g) + i2 (g) >< 2hi(g)

Posted from TSR Mobile

Attachment 207634

Those are my workings and the books answer is (sorry I cba to type)
And the question
2. (Original post by Georgiina_Tee)
So I'm basically working through some questions out if the text book and I'm not sure why i'm wrong

The question is
0.4 mil of H2 and 0.3 mol of I2 were mixed in a 2dm3 flask and allowed to reach equilibrium. The equilibrium mixture contained 0.2 mil of HI. Deduce the amount of h2 and i2 in the equilibrium mixture and calculus kc for h2(g) + i2 (g) >< 2hi(g)

Posted from TSR Mobile

Attachment 207634

Those are my workings and the books answer is (sorry I cba to type)
And the question
in eqm question, you'd almost always need to set up an equilibrium table like the following,

H2 + I2 <--> 2HI

H2 I2 HI
mol at start 0.4 0.3 0
mol at eqm 0.2

so if at eqm, you get 0.2 mol of HI, that means from the balanced eqn, mol of H2 reacted = mol of I2 reacted = 1/2 mol of HI produced = 1/2 * 0.2 = 0.1 mol

hence mol of H2 left at eqm = mol of H2 at start - mol of H2 reacted = 0.4 - 0.1 = 0.3 mol

calculate the same for mol of I2 at eqm.

Then as gases occupy volume of container, then from mol at eqm, calculate concentration at eqm, then apply normal expression for Kc to evaluate.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 8, 2013
Today on TSR

I've studied the wrong subject

...Should I go back to school?

Should I complain about my supervisor?

Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE