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A first order reaction has a rate consta...

A first order reaction has a rate constant `1.15xx10^(-3)s^(-1)`. How long will 5 g of this reactant take to reduce to 3 g?

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`k=1.15xx10^(-3)s^(-1)`
`[R_0]=5g, [R]=3g`
`thereforet=2.303/klogfrac{[R_0]}{[R]}=2.303/1.15xx10^(-3)logfrac{5}{3}=2xx10^3log(1.667)=2xx10^3xx0.222=444 "seconds"
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