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The concentration of Na+ in seawater is 460 x 10-3 g kg-1 water and the mass of seawater = 1.35 x 1024g

a) Calculate the total amount of Na+ in the oceans.

b) Given that the present flux of anthropogenic Na+ into the oceans is 3.39 x 1012 mol yr-1, how long would it take to increase the concentration of Na+ in seawater by 10%? Assume no increase in the output flux to counterbalance the increased input.

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