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Calculating concentration at equilibrium

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The equilibrium constant Kc for the reaction is 54.3 at 430 deg C
H2(g)+I2(g) f/r 2HI(g)
At the start of the reaction there are 0.714 mole of H2, 0.984 mole of I2, and 0.886 mole of HI in a 1.90 L reaction chamber. Calculate concentrations of the gases at equilibrium:
[H2]=
[I2]=
[HI]=

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The initial concentrations of each species are given. One needs to find the Ktrial (trial Keq) in order to determine the direction of equilibrium shift:

H2(g) + I2(g) <--> 2 HI(g)
Kc = ( [HI]^2 ) / ( ...

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