Question: i need help with the residence time and how to calculate it. - EXERCISE 5: Show that the residence time for atmospheric SO2 with respect

i need help with the residence time and how to calculate it. i need help with the residence time and how to calculate it.

- EXERCISE 5: Show that the residence time for atmospheric SO2 with respect to its dissolution and subsequent removal through precipitation (as dissolved H2SO3,HSO3, and SO32 ) is independent of the atmospheric concentration of SO2 and depends only on the pH of the precipitation and the precipitation rate. At a pH of 5.51 (Eq. 18) and a precipitation rate of 1m/yr, what is the residence time? In a pristine atmosphere, what fraction of the SO2 emitted to the atmosphere from natural sources would be removed via this rain-out process

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