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.
