gen Chromium av) hypochlorite gas (H2C 2) can be generated in the lab by reactin
ID: 483004 • Letter: G
Question
gen Chromium av) hypochlorite gas (H2C 2) can be generated in the lab by reacting aqueous 22 A) chloride (CI-1) with acidified Chromium (IV) oxide. write the reaction for the above process. B) A 25.00 ml sample of 0.250M HCl is dissolved and is completely reacted with excess Chromium (IV)oxide. t The H2Cr(CIO)2 produced is dried and stored in a sealed container. At22 Celcius, the pressure of the gas in container is 0.95 atm. )calculate the moles of Cl-1 ions present before any reaction occurs. iicalculate the volume in liters of the H2Cr(Clo)2 gas in the sealed container. An Initial Rate study was performed on the system and the data is given below trial [Cl-1] [Cro2] [H+] Rate 0.0104 0.00400 3.000 000225 0.0312 0.00400 3.00 00203 3 0.0312 0.00200 3.00 00102 0.312 0.00200 6.00 00101Explanation / Answer
From the given data,
let rate law be,
rate = k[Cl-]^x.[CrO2]^y.[H+]^z
i) from 1 and 2,
rate 1/rate 2 = 0.000225/0.00203 = (0.0104/0.0312)^x
taking log on both sides,
x = 2
order with respect to [Cl-] = 2
from 2 and 3,
rate 2/rate 3 = 0.00203/0.00102 = (0.004/0.002)^y
taking log on both sides,
y = 1
order with respect to [CrO2] = 1
from 3 and 4,
rate 3/rate 4 = 0.00102/0.00101 = (3/6)^z
taking log on both sides
z = 0
order with respect to [H+] = 0
ii) rate law = k[Cl-]^2.[CrO2]
D. from the above calculation
i) rate constant k = 0.000225/(0.0104)^2 x 0.004 = 520.06
E) the proposed mechanism is valid as H+ is participating in the fast step only and thus does not affect the rate of the reaction.
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