Hydrogen Iodide Decomposes According to the Equation 2HI(g) H₂(g)

question 27

Multiple Choice

Hydrogen iodide decomposes according to the equation 2HI(g) H₂(g) + I₂(g) , for which K_c = 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

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