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deshawnnash53
28.06.2019 •
Chemistry
The reaction 2hi → h2 + i2 is second order in [hi] and second order overall. the rate constant of the reaction at 700°c is 1.57 × 10−5 m −1s−1. suppose you have a sample in which the concentration of hi is 0.75 m. what was the concentration of hi 8 hours earlier?
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Ответ:
1.135 M.
Explanation:
For the reaction: 2HI → H₂ + I₂,The reaction is a second order reaction of HI,so the rate law of the reaction is: Rate = k[HI]².
To solve this problem, we can use the integral law of second-order reactions:1/[A] = kt + 1/[A₀],
where, k is the reate constant of the reaction (k = 1.57 x 10⁻⁵ M⁻¹s⁻¹),
t is the time of the reaction (t = 8 hours x 60 x 60 = 28800 s),
[A₀] is the initial concentration of HI ([A₀] = ?? M).
[A] is the remaining concentration of HI after hours ([A₀] = 0.75 M).
∵ 1/[A] = kt + 1/[A₀],
∴ 1/[A₀] = 1/[A] - kt
∴ 1/[A₀] = [1/(0.75 M)] - (1.57 x 10⁻⁵ M⁻¹s⁻¹)(28800 s) = 1.333 M⁻¹ - 0.4522 M⁻¹ = 0.8808 M⁻¹.
∴ [A₀] = 1/(0.0.8808 M⁻¹) = 1.135 M.
So, the concentration of HI 8 hours earlier = 1.135 M.
Ответ:
sulpher is precipitated
Explanation: