Question

In the formation of sulphur trioxide by the contact process,
`2SO_(2)+O_(2) hArr 2SO_(3)`, the rate of reaction was measured as
`(d[O_(2)])/(d t) = 3.0 xx 10^(-4) "mol" L^(-1)s^(-1)`.
The rate of reaction expressed in terms of `SO_(3)` will be
A. `3.0 xx 10^(-4) mol L^(-1) s^(-1)`
B. `6.0 xx 10^(-4) mol L^(-1) s^(-1)`
C. `1.5 xx 10^(-4) mol L^(-1) s^(-1)`
D. `4.5 xx 10^(-4) mol L^(-1) s^(-1)`

Answer 1

Correct Answer - B
`-(d[O_(2)])/(d t) = +(1)/(2)(d[SO_(3)])/(d t)`
`3 xx 10^(-4) = (1)/(2) (d[SO_(3)])/(d t)`
`(d[SO_(3)])/(d t) = 6 xx 10^(-4) M//sec`.