Physics, 28.04.2021 17:20, Kikilcaro4423
For the decomposition of urea in the reaction: CO(NH2)2(aq) + 2 H2O(l) β 2NH4 + (aq) + CO3 2β (aq) the pseudo first-order rate constant is 1.2 Γ 10β7 s β1 at 60Β°C and 4.6 Γ 10 β7 s β1 at 70Β°C. A) Estimate the activation energy b) Calculate the entropy of activation of the reaction and comment on the value.
Answers: 2
Physics, 21.06.2019 23:30, KKHeffner02
Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0Γ10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?
Answers: 1
Physics, 22.06.2019 14:30, willoughbysierra
The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.
Answers: 1
For the decomposition of urea in the reaction: CO(NH2)2(aq) + 2 H2O(l) β 2NH4 + (aq) + CO3 2β (aq) t...
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