Concentration changes at equilibrium?

Posted on 2016-05-10 18:36:00 in Chemistry by DAN

The equilibrium constant, K, for the following reaction is 1.80×10-2 at 698 K. 

2HI(g) H2(g) + I2(g) 

An equilibrium mixture of the three gases in a 1.00 L flask at 698 K contains 0.319 M HI, 4.28×10-2 M H2 and 4.28×10-2 M I2. 

What will be the concentrations of the three gases once equilibrium has been reestablished, if 3.50×10-2 mol of H2(g) is added to the flask? 

[HI] = M 
[H2] = M 
[I2] = M

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