onu older in and the order with respect to O2 is found to be-1, The rate constan
ID: 559224 • Letter: O
Question
onu older in and the order with respect to O2 is found to be-1, The rate constant is 2.6 × 104 s-1 at a certain temperature, what is the rate of the reaction if 1031-1.1 * 10-3 M and 102] " 3.4 × 10-2 M? B) 0.97 C) 1.1 x 10-3 )26 104 16) The rate constant for a particular reaction is 2.7 x 10-2s-1 at 25C and 6.2 10-2s-1 at 115 C. What is the D) 840 activation energy for the reaction, in kJ/mol? A) 87 B) 13 C) 0.089 D) 0.0045 17) The activation energy for a reaction is 37.6 kJ/mol. The rate constant for the reaction is 54 10-3-1 at 4SC Calculate the rate constant at 145 C A) 0.38 B) 0.56 C) 8.4 x 10-3 D) 5.5 10-3 E) 0.16 18) For the reaction A -B, the activation energy, Ea -125 kJ/mol and the heat of reaction, AH 50 kJ/mol What i the Ea for the reverse reaction, in J/mol? A) 125 B) 175 C) -175 D) 75 E) -75 9) Consider the following 2-step mechanism. Which of the species in the mechanism is the catalyst? H202IH2OO1 H202 o H20 02+ slow step fast step 2 H202 - 2 H2O+O2 net reaction c) H202 D) or- A) H20 B) 02Explanation / Answer
16)
we have:
T1 = 25 oC
=(25+273)K
= 298 K
T2 = 115 oC
=(115+273)K
= 388 K
K1 = 2.7*10^-2 s-1
K2 = 6.2*10^-2 s-1
we have below equation to be used:
ln(K2/K1) = (Ea/R)*(1/T1 - 1/T2)
ln(6.2*10^-2/2.7*10^-2) = ( Ea/8.314)*(1/298.0 - 1/388.0)
0.8313 = (Ea/8.314)*(7.784*10^-4)
Ea = 8879 J/mol
Ea = 8.9 KJ/mol
Answer: E
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