Question

Heat evolved in the reaction H2 + Cl2 + 2HCl is 182 kJ. Bond energies of H-H and Cl-Cl are 430 and 242 kJ/mol respectively. The
H-Cl bond energy is :
O 245 kJ mol-1
O 427 kJ mol-1
O 336 kJ mol-1
O 154 kJ mol-1

Answer 1

Explanation:

ANSWER

ΔH

f

for HCl is−182KJ/2=−91KJ

2

1

H

2

2 + 1

Cl

2

=HCL

Δ

f

H = ΔH

B

E reactants - ΔH

B

E products

−91=

2

1

×430+

2

1

×242 - ΔH

B

E products

ΔH

B

E products =91+215+121=427KJmol

−1

Hence, the correct option is B.

Answer 2

Answer:

HOPE THIS ANSWER HELPS YOU ?

Explanation:

ΔH  

f

​  

  for HCl is−182KJ/2=−91KJ

2

1

​  

H  

2

​  

 +  

2

1

​  

Cl  

2

​  

 =HCL

Δ  

f

​  

H = ΔH  

B

​  

E reactants -  ΔH  

B

​  

E products

−91=  

2

1

​  

×430+  

2

1

​  

×242 - ΔH  

B

​  

E products

ΔH  

B

​  

E products =91+215+121=427KJmol  

−1

 

Hence, the correct option is B.