Anyone good at chemistry??

Question

N2 + 3H2 = 2NH3

0.65M of nitrogen and 0.70M of hydrogen mixed, at equilibrium concentration of ammonia is 0.20M. what is the concentration of H2 in the equilibrium mixture?

help pleaaaase

Answer 1

This is a screwy question I looked at it and usually you get one unknown concentration that you have to find given your Kc.

It would be straight up 0.70M hydrogen

BUT CHECK other peoples work first

Answer 2

N2     +    3H2    =     2NH3

0.65M //     0.7M   //         0M //   intial

-x         //   -3x        //     +2x   //  change

0.65-x     // 0.7-3x     //     2x    //  equilibrium

2x = 0.2M

x = 0.1M

0.7 - 3 (0.1) = 0.4M

[H2] = 0.4M