Answers: MCQ Online Exercise 3_6A Hess’s Law

 

1.
 -672 kJ mol-1
 
 2.
 +206 kj mol-1
 
 
 3.
 -2168 kj mol-1
 
  4.
 a)  
 
 b) 
 Reagent A - H2

Reagent B - Cl2

Reagent C - HCl
 5.
molar ratio 1 mole HCl reacts with 1 mole AgNO3

AgNO3:  n= cv

0.5 x 0.02 = 0.01 moles.

[0.01 moles AgNO3 can react with 0.01 moles HCl]

HCl:  n= cv

1 X 0.015 = 0.015 moles
 Conclusion:  more moles HCl than AgNO3 so HCl is in excess. 
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