1)For a given reaction, the rate constant doubles when the temperature is increa
ID: 937618 • Letter: 1
Question
1)For a given reaction, the rate constant doubles when the temperature is increased from 43.5 °C to 71.5 °C. What is the activation energy for this reaction? (R = 8.314 J/K×mol)
___kJ/mol
2)The vapor pressure of liquid carbon tetrachloride, CCl4, is 100. mm Hg at 296 K. A 0.173 g sample of liquid CCl4 is placed in a closed, evacuated 370. mL container at a temperature of 296 K. The molecular mass of carbon tetrachloride equals 153.82 g/mol. (R = 0.08206 L*atm/mol*K, and 1 atm = 760 mmHg)
What will the pressure in the container be when equilibrium is reached?____mm Hg
3)
For the second-order reaction below, the initial concentration of reactant A is 0.227 M. If the rate constant for the reaction is 1.03E-2 M–1s–1, what is the concentration of A after 244 seconds?
_____ M
2A B + C rate = k[A]2Explanation / Answer
1)
ln (k2/k1) = Ea / R [1/T1 - 1/T2]
ln (2 ) = Ea / (8.314 x 10^-3) [1/316.5 - 1/344.5]
Ea = 22.44 kJ/mol
activation energy = Ea = 22.44 kJ/mol
3)
initial concentration of reactant A = 0.227 M.
rate constant for the reaction = 1.03E-2 M–1s–1,
time t = 244 seconds?
k = 1/t [1/At - 1/Ao]
1.03 x 10^-2 = 1 / 244 [1/At - 1/0.227]
At = 0.144 M
concentration = 0.144 M
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