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Nitric acid can be produced from the reaction of ammonia with oxygen according to the equation:

4 NH₃ (g) + 5 O₂ (g) 4 NO (g) + 6 H₂O (g)

1 mol/min of ammonia and 6 mol/min of air (79% N₂, 21% O₂) enters the reactor at 80 ^oC. 80% conversion of ammonia is achieved inside the reactor and no side reactions occur. Calculate the heat requirement if the temperature of the gas leaving the reactor is 400 ^oC.