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1. Write the balanced! Calculate the entha N2 (9) 2NO 2. Methylhydrazine (N formation of the rea 4N2H3

1. Write the balanced! Calculate the entha N2 (9) 2NO 2. Methylhydrazine (N formation of the rea 4N2H3

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter6: Thermochemistry
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1. Write the balanced equation for the production of the brown nitrogen dioxide (NO2) gas from nitrogen and oxygen gases. Calculate the enthalpy of the reactions given below. N2 (g) +O2 2NO (g) 2NO (g) AH = 180 kJ ne 2NO(g) +Q2 (g) AH = 112 kJ 2. Methylhydrazine (N2H3CH3) is common liquid propellant used in rocket fuels. Look for the standard molar enthalpies of formation of the reactants and products. Calculate the AH° for the reaction per mole of N2H3CH3. 4N2H3CH3 (1) + 5N2O4 () 12H20 (g) +9N2 (g) +4CO2 (g)
Transcribed Image Text:1. Write the balanced equation for the production of the brown nitrogen dioxide (NO2) gas from nitrogen and oxygen gases. Calculate the enthalpy of the reactions given below. N2 (g) +O2 2NO (g) 2NO (g) AH = 180 kJ ne 2NO(g) +Q2 (g) AH = 112 kJ 2. Methylhydrazine (N2H3CH3) is common liquid propellant used in rocket fuels. Look for the standard molar enthalpies of formation of the reactants and products. Calculate the AH° for the reaction per mole of N2H3CH3. 4N2H3CH3 (1) + 5N2O4 () 12H20 (g) +9N2 (g) +4CO2 (g)
SAMPLE PROBLEMS: rimsts 1. Using the standard molar enthalpies of formation given, calculate the standard enthalpy of reaction for the combustion of propane (C3He) into carbon dloxide and water. C3HB (g) + 502 (g) +3CO2 (g) + 4H20 (g) CaHa (g) -104.0 CO2 (g) -393.5 H20 (g) -241.8 O2 (g) Substance AH°: (kJ/mol) Solution: CM EAH°nm = [3AH°r (CO2, g) +4AH°, (H20, g)]-[AH°: (C3Ha, g) +5AH°; (O2, g)] =[3(-393,5 kJ) +(-241.8 kJ)] – [(-104.0 kJ) + 5 () = -2043.7 kJ 2. The thermochemical equation for the incomplete combustion of carbon into carbon monoxide is represented as 20 (s) +O2 (9) → 200 (g) Compute for the AH of the reaction if the overall process above can occur in two steps whose themochemical equations are given below: (1) C (s) +O2 (g) (2) 2CO (g) +O2 (9) CO2 (g) 2C02 (g) AH = -393.5 kJ AH = -566.0kJ
Transcribed Image Text:SAMPLE PROBLEMS: rimsts 1. Using the standard molar enthalpies of formation given, calculate the standard enthalpy of reaction for the combustion of propane (C3He) into carbon dloxide and water. C3HB (g) + 502 (g) +3CO2 (g) + 4H20 (g) CaHa (g) -104.0 CO2 (g) -393.5 H20 (g) -241.8 O2 (g) Substance AH°: (kJ/mol) Solution: CM EAH°nm = [3AH°r (CO2, g) +4AH°, (H20, g)]-[AH°: (C3Ha, g) +5AH°; (O2, g)] =[3(-393,5 kJ) +(-241.8 kJ)] – [(-104.0 kJ) + 5 () = -2043.7 kJ 2. The thermochemical equation for the incomplete combustion of carbon into carbon monoxide is represented as 20 (s) +O2 (9) → 200 (g) Compute for the AH of the reaction if the overall process above can occur in two steps whose themochemical equations are given below: (1) C (s) +O2 (g) (2) 2CO (g) +O2 (9) CO2 (g) 2C02 (g) AH = -393.5 kJ AH = -566.0kJ
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