Question

In: Chemistry

Using the following data reactions: ?H

Using the following data reactions:

?H

Expert Solution

Given H₂(g) + Cl₂(g) 2HCl(g) : H⁰ = -184KJ --------------- (1)

H₂(g) 2H(g) : H⁰₁ = 432KJ ----------------(2)

Cl₂(g) 2Cl(g) : H⁰₂ = 239 KJ ---------------- (3)

The formation of HCl can be expressed as

H-H + Cl-Cl 2 H-Cl

Thus the reaction indicates that,

(1) One Cl-Cl bond is broken

(2) One H-H bond is broken

(3) Two H-Cl bonds are formed

The enthalpy change for the reaction will be given by

H⁰ = ( H⁰_Cl-Cl + H⁰_H-H) - ( 2xH⁰_H-Cl )

( 2xH⁰_H-Cl ) = ( H⁰_Cl-Cl + H⁰_H-H) - H⁰

= ( 239 KJ + 432KJ ) - (-184KJ )

= 855 KJ

H⁰_H-Cl = 855 / 2

= 427.5 KJ

Therefore energy of an H-Cl bond is 427.5 KJ

queen_honey_blossom answered 1 hour ago

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