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NH3 is used to prepare HNO3. Oxidation of NH3 to produce NO is the first step....

NH3 is used to prepare HNO3. Oxidation of NH3 to produce NO is the first step. What is the standard enthalpy change for this reaction?

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Answer #1

answer : H = - 24.8 Kcal/mol

Oxidation of ammonia is carried out in a catalytic chamber in which one part of ammonia and eight parts by volume of oxygen are reacted.

4 NH3 + 5 O2   ----------------> 5 NO + 6 H2O      H = - 24.8 Kcal/mole

H = - 24.8 Kcal/mol

Oxidization of ammonia is a reversible and exothermic reaction. Therefore according to Le- chatelier's principle,a decrease in temperature favours the reaction in forward direction. In primary oxidization 95% of ammonia is converted into nitric oxide (NO)

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