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What is the standard enthalpy change for the reaction 2NO(g) + O2(g) ⟶ 2NO2(g) , given that the standard enthalpy of formation of NO(g), O2(g) and NO2(g) are 90.4 kJ/mol , 0 kJ/mol, and 33.2 kJ/mol, respectively?
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Mar 1
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Chemical thermodynamics
by
TheScientist
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What is the standard enthalpy change for the reaction 2NO(g) + O2(g) ⟶ 2NO2(g) , given that the standard enthalpy of formation of NO(g), O2(g) and NO2(g) are 90.4 kJ/mol , 0 kJ/mol, and 33.2 kJ/mol, respectively?
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TheScientist
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To calculate the standard enthalpy change for the reaction, we can use the formula:H reaction = Hf products - Hf reactants where Hf represents the standard enthalpy of formation of each substance.For the given reaction:2NO g + O2 g 2NO2 g The standard enthalpy of formation for each substance is:NO g = 90.4 kJ/molO2 g = 0 kJ/molNO2 g = 33.2 kJ/molNow, we can plug these values into the formula:H reaction = [2 33.2 kJ/mol NO2 ] - [2 90.4 kJ/mol NO + 0 kJ/mol O2 ]H reaction = 66.4 kJ/mol - 180.8 kJ/mol H reaction = -114.4 kJ/molThe standard enthalpy change for the reaction is -114.4 kJ/mol.
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