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Hardness of Water and Treatment

27 The reacti...

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27 The reaction of hydrogen and iodine mono chloride is given as H2+2ICl gives 2HCl+I2 This reaction is of first order with respect to H2(g) and ICl(g) following the mechanisms given below were proposed Mechanism 1 H2+2ICl(g) gives 2 HCl (g)+I2 Mechanism 2 H2(g)+ICl(g) gives HCl(g)+I2 ;slow HI(g)+ICl(g) gives HCl(g)+I2(g) ;fast which of the above mechanisms can be consistent with the information about the reaction?

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The reaction of hydrogen and iodine monochloride is given as:
$H_{2} (g) + 2 I C l (g) \to 2 H C l (g) + I_{2} (g)$

This reaction is of first order with respect to $H_{2} (g)$ and $I C l (g)$ , following mechanisms were proposed :
Mechanism A : $H_{2} (g) + 2 I C l (g) \to 2 H C l (g) + I_{2} (g)$

Mechanism B : $H_{2} (g) + I C l (g) \to H C l (g) + H I (g), s l o w$

$H I (g) + I C l (g) \to H C l (g) + I_{2} (g), f a s t$
Which of the above mechanism(s) can be consistent with the given information about the reaction?

Q. The reaction at hydrogen and iodine monochloride is represented by the equation is

H_{2} (g) + 2 I C l (g) \to 2 H C l (g) + I_{2} (g)

This reaction is first order in

H_{2} (g)

and also first - order in ICI(g). which of these proposed mechanism can be consistent with the given information about this reaction ?
Mechanism I :

H_{2} (g) + 2 I C l (g) \to 2 H C l (g) + I_{2} (g)

H_{2} (g) + I C l (g) s l o w \to H C l (g) + H I (g)

H I (g) + I C l (g) f a s t \to H C l (g) + I_{2} (g)

Q. The following reaction has a second-order rate law:

H_{2} (g) + 2 I C l (g) \to I_{2} (g) + 2 H C l (g)

= k [H_{2}] [I C l]

Devise a possible reaction mechanism.

Q. The enthalpy changes for the following processes are listed below

C l_{2} (g) = 2 C l (g),

242.3 k j m o l^{- 1}

I_{2} (g) = 2 I (g),

151.0 k j m o l^{- 1}

I C l (g) = I (g) + C l (g),

211.3 k j m o l^{- 1}

I_{2} (s) \to I_{2} (g),

62.76 k j m o l^{- 1}

Given that the standard stales for iodine and chlorine are

I_{2} (s)

C l_{2} (g)

, Calculate the standard enthalpy formation for

I C l (g)

Q. The enthalpy changes for the following processes are listed below:

C l_{2} (g) = 2 C l (g), 242.3 k J m o l^{- 1}

I_{2} (g) = 2 I (g), 151.0 k J m o l^{- 1}

I C l (g) = I (g) + C l (g), 211.3 k J m o l^{- 1}

I_{2} (s) = I_{2} (g), 62.76 k J m o l^{- 1}

Given that the standard states for iodine and chlorine are

I_{2} (s)

C l_{2} (g)

, the standard enthalpy of formation for

I C l (g)

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