Question

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. `5.0 xx 10^(-4) mol L^(-1) s^(-1)`
B. `-2.25 xx 10^(-4) mol L^(-1) s^(-1)`
C. `3.75 xx 10^(-4) mol L^(-1) s^(-1)`
D. `50.0 xx 10^(-4) mol L^(-1) s^(-1)`

Answer 1

Correct Answer - A
`2SO_(2)(g)+O_(2)(g) hArr 2SO_(3)(g)`
Rate `= (-d[SO_(2)])/(dt) = (-d[O_(2)])/(dt)`
`:. (-d[SO_(2)])/(dt) = 2 xx (-d[O_(2)])/(dt)`
`= 2xx 2.5 xx 10^(-4)`
`= 5.0 xx 10^(-4) mol^(-1) L s^(-1)`

Answer 2

Correct Answer - A
`2SO_(2)(g)+O_(2)(g) hArr 2SO_(3)(g)`
Rate `= (-d[SO_(2)])/(dt) = (-d[O_(2)])/(dt)`
`:. (-d[SO_(2)])/(dt) = 2 xx (-d[O_(2)])/(dt)`
`= 2xx 2.5 xx 10^(-4)`
`= 5.0 xx 10^(-4) mol^(-1) L s^(-1)`