21. The first-order isomerization reaction: n: cycloprop opane → propene, has a rate constant of . What is the activation energy, Ea, for the reaction? (A)46 klJ/mol (B) 110kJ/mol (C) 260 kJ/mol (D) 380 kj/mol

17. How much heat is released when 95.0 g of steam at 100.0℃ is cooled to ice at -15.0℃ ? The enthalpy of vaporization of water is 40.67 kJ/mol, the enthalpy of fusion for water is 6.01 kJ/mol, the molar heat capacity of liquid water is 75.4 J/(mol ．℃ ), and the molar heat capacity of ice is 36.4 J/(mol ．℃ ). (A)54.8 kJ (B) 247 kJ (C) 289 kJ (D) 314 kJ

21. The first-order isomerization reaction: n: cycloprop opane → propene, has a rate constant of . What is the activation energy, E_a, for the reaction?
(A)46 klJ/mol
(B) 110kJ/mol
(C) 260 kJ/mol
(D) 380 kj/mol

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