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ECAT - Practice Test - Chemistry - Energetics Quiz

Attempt 10 MCQs on ECAT - Practice Test - Chemistry - Energetics | Quiz 5

41. When does ΔH approximately equal ΔU?



42. What is the enthalpy of vaporization?



43. What is the enthalpy of fusion?



44. What is the enthalpy of sublimation?



45. What is the relationship between ΔH_sub, ΔH_fus and ΔH_vap?



46. Calculate ΔH for combustion of ethanol using given ΔH_f° values: CO₂=-393.5, H₂O(l)=-285.8, C₂H₅OH=-277.7 (O₂=0).



47. Using bond energies (H-H=436, Cl-Cl=243, H-Cl=432 kJ/mol), calculate ΔH for H₂ + Cl₂ → 2HCl.



48. Calculate the standard enthalpy of formation of ethanol using the combustion data and ΔH_f° of CO₂ and H₂O.



49. Using bond energies (C-H=413, C-C=348, C=C=614, H-H=436), calculate ΔH for C₂H₄ + H₂ → C₂H₆.



50. Given ΔH_f° H₂O(g) = -241.8 kJ/mol and H₂O(l) = -285.8 kJ/mol, find the enthalpy of vaporization of water.



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