5. From the following heats of combustion,3CH,OH +-0,Oxe) →COe) + 2H,Ou2(g)2ΔΗ2(g)=-726.4kJrxnCigraphite) + O2c8)→ CO,ДН3-393.5kJ2(g)rxn1H2) +,O22) →H,OuΔΗ22(g)=-285.8kJrxnCalculate the enthalpy of formation of methanol, CH3OH, from its elements:1Cgraphite) + H2) +,O22) → CH,OH2

If we reverse any reaction sign will change of ∆H but magnitude remain same We multipy may equation…

5. From the following heats of combustion, 3 CH,OH + Oe → COue) +2H,Ou 2(8) AH° =-726.4kJ (1) 2(g) 2 rxn Cigraphite) + O2(8) →CO«g) AH° =-393.5kJ rxn 1 +÷0, +Oe) → H,Ou 2 H218) ΔΗ. =-285.8kJ rxn Calculate the enthalpy of formation of methanol, CH3OH, from its elements: Cgraphie) + H3) +÷2%e) →CH,OHa (graphite)

5. From the following heats of combustion, 3 CH,OH + Oe → COue) +2H,Ou 2(8) AH° =-726.4kJ (1) 2(g) 2 rxn Cigraphite) + O2(8) →CO«g) AH° =-393.5kJ rxn 1 +÷0, +Oe) → H,Ou 2 H218) ΔΗ. =-285.8kJ rxn Calculate the enthalpy of formation of methanol, CH3OH, from its elements: Cgraphie) + H3) +÷2%e) →CH,OHa (graphite)

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Determine the AH of the reaction 1 1 NO2(9) + 702cg) +;H20g) → HN03(aq) 1 5 N2cg) + O2(g) → NO2(9) NO29) AH = 33.2 kJ 1 1 3 Hzo) + Naca) +02l@) → HNO3(a2) AH = -202.3 kJ ΔΗ +5N2(9) +502(g) → HNO3(aq) 1 +,02(9) → H20(9) AH = -285.8 kJ H2(g)
3. Given the following equations and AH values, determine the heat of reaction at 298 K for the reaction C(s) + 2 H₂(g) → CH₁(B) C(s) + O₂(g) → CO₂(g) ΔΗ = -393.5 kJ H₂(g) + 1/2O₂(g) → H₂O(l) ΔΗ = -285.8 kJ ΔΗ = +890.3 kJ CO,(g) + 2 H,O(l) > CH%(g) + 2 Oz(g)
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