Hydrogen iodide decomposes according to the equation 2HI(g) 
H2(g) + I2(g) , for which Kc = 0.0156 at 400ºC. Suppose 0.550 mol HI was injected into a 2.00-L reaction vessel at 400ºC. What is the concentration of H2 at equilibrium?
A) 0.275 M
B) 0.138 M
C) 0.0275 M
D) 0.0550 M
E) 0.220 M
Correct Answer:
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