first order radio active decay of thorium-234 is used to calculate the movement of sinking particles in the upper water

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answerhappygod
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first order radio active decay of thorium-234 is used to calculate the movement of sinking particles in the upper water

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first order radio active decay of thorium-234 is used to calculate the movement of sinking particles in the upper water column of the ocean.
The reaction is 234^Th —> 234^Pa + β this reaction has a rate constant = 2.88x10^-2 d^-1.
a.) What is the half life of this reaction?
b.) If [Th]0 = 3.8nM or 3.8x10^-9 M, how long will it take for 90% of the Thorium to decay?
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