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The decomposition of Ab(g)rarrA(g)+B(g),...

The decomposition of `Ab(g)rarrA(g)+B(g)`, is first order reaction with a rate constant `k=4xx10^(-4)s^(-1)` at 318 K . If AB has 26664 Pa pressure at the initial stage, what will be the partial pressure of AB after half an hour?

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The correct Answer is:
`12981.7` Pa
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