The dense aerosol cloud created caused decreases in the amount of solar radiation that reached the Earths surface.
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V=650 ml = 0.65 l
c=0.4 mol/l
n=vc
n=0.65 l * 0.4 mol/l = 0.26 mol
This helps to lower the temperature of the system so that the vapours produced during the reaction can be distilled in liquid form and can easily be collected.