Homework Help: chemistry

Posted by James on Sunday, October 25, 2009 at 5:28pm.

The equilibrium constant (Kc) for the gas phase reaction 2 NH3 N2 + 3 H2 is 3.0 x 10-3 at some temperature. The reaction is started by placing a 0.040-mol sample of ammonia in an empty one-liter flask. When equilibrium is established how much N2 is present?

1. ) 0.019 mol
2. ) 0.013 mol
3. ) 0.010 mol
4. ) 0.016 mol

chemistry - DrBob222, Sunday, October 25, 2009 at 8:52pm
A major suggestion: You MUST write an arrow; otherwise, we don't know where the reactants end and the products begin.
a. Place the arrow.
b. Set up an ICE chart.
c. Plug the ICE numbers into the Kc experession.
d. solve.
chemistry - Mike, Monday, October 26, 2009 at 12:02am
I don't get the answer i have tried it over at least 10 times. I did the ice table and everything.

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