In the formation of sulphur trioxide by the contact process, 2SO2+O2⇌2SO3, the rate of reaction was measured as −d[O2]dt=3.0×10−4molL−1s−1. The rate of reaction expressed in terms of SO3 will be:
A
3.0×10−4molL−1s−1
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B
6.0×10−4molL−1s−1
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C
1.5×10−4molL−1s−1
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D
4.5×10−4molL−1s−1
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Solution
The correct option is B6.0×10−4molL−1s−1 −d[O2]dt=12ddt[SO3]=3×10−4molL−1s−1ddt[SO3]=6.0×10−4molL−1s−1