**YOU MUST SHOW CALCULATION WORK TO RECEIVE CREDIT ** If the equilibrium constan

Question

**YOU MUST SHOW CALCULATION WORK TO RECEIVE CREDIT **

If the equilibrium constant, K, is known for a reaction (the ratio of products to reactants once the forward and reverse rates of reaction are equal) that value can be used to determine the final equilibrium concentrations of the reactants and products in the system. The equilibrium ratio does include the adjustments due to the stoichiometry of the reaction. *** Remember that coefficients become exponents in the P/R ratio; also no solids or liquids are allowed in the equilibrium expression***

Hydrogen iodide is used industrially to produce several compounds including acetic acid and some animal feeds. It is also on list 1 of the DEA list of chemicals due to its recent use in

Explanation / Answer

H2 + I2 ----> 2HI

for H2 , I2 and HI

I: 0.34 , 0.42 , 0

C: -x , -x , +2x

E: 0.34 -x , 0.42- x , 2x

so

K= [HI]2 / [H2] [I2 ]

K= 54.3 = ( 2x)2 / ( 0.34 - x ) ( 0.42 - x )

solving we get

x= 0.53 and 0.291

if x= 0.53 then 0.34-x <0

so x not equal to 0.53

so x = 0.291

now [H2] = 0.34 - 0.291 = 0.049 M

[I2] = 0.42 - 0.291= 0.129 M

[HI] = 2x = 2 x 0.291 = 0.582 M

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