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In the formation of sulphur trioxide by ...

In the formation of sulphur trioxide by the contact process,
`2SO_(2)(g)+O_(2)(g) hArr 2SO_(3)(g)`
The rate of reaction is expressed as
`-(d(O_2))/(dt) = 2.5 xx 10^(-4) mol L^(-1) s^(-1)`
The rate of disappearance of `(SO_(2))` will be

A

`-1.25 xx 10^(-4)`

B

`-2.50 xx 10^(-4)`

C

`-3.75 xx 10^(-4)`

D

`-5.00 xx 10^(-4)`

Text Solution

Verified by Experts

The correct Answer is:
D
From rate law
`-(1)/(2)(dSO_(2))/(dt)=-(dO_(2))/(dt)=(1)/(2)(dSO_(3))/(dt)`
`:. -(dSO_(2))/(dt)=-2 xx (dO_(2))/(dt)`
`=-2 xx 2.5 xx 10^(-4)`
`= -5 xx 10^(-4) mol L^(-1) s^(-1)`
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