20. The second-order reaction, has a rate constant equal to 3.0 x If the initial concen entration , how long will it take for 90.% of the reactant to disappear? (A)(B) (C) (D)

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

20. The second-order reaction, has a rate constant equal to 3.0 x If the initial concen entration , how long will it take for 90.% of the reactant to disappear?
(A)
(B)
(C)
(D)

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