Consider the formation reaction for HNO 3 for which the enthalpy is ?174 kJ/mol.

Question

Consider the formation reaction for HNO3 for which the enthalpy is ?174 kJ/mol. What is the heat of the reaction when 5.00 grams of hydrogen are reacted?

(1) -863 kJ                  (2) -1730 kJ                (3) -70.2 kJ                 (4) -432 kJ                  (5) -140 kJ

Consider the formation reaction for HNO3 for which the enthalpy is ?174 kJ/mol. What is the heat of the reaction when 5.00 grams of hydrogen are reacted?

(1) -863 kJ                  (2) -1730 kJ                (3) -70.2 kJ                 (4) -432 kJ                  (5) -140 kJ

Explanation / Answer

For forming 1 mole of HNO3 1/2 mole = 1/2X 2.016 = 1.008gm of Hydrogen is necessary
Enthalpy of formation= 174KJ

Now for 5 gms of Hydrogen;
Heat of reaction = 5/1.008 X 174 = -863KJ

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