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Can someone explain to me how to solve this please? A student using a spectrometer to...

Can someone explain to me how to solve this please?

A student using a spectrometer to measure the transmission of mixture to study kinetics. The standard of the reacting species is 0.0140. The student measured %T of the standard and it is 60.7. After 5 minutes, the %T value is 82.9.  calculate the molarity of the reacting species at 5 minutes.

The blank in this case is 100%T

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