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(200 g)/(39.0983 g/mol + 35.453 g/mol)*(Avogadro constant)*(0.0117%)*ln(2)/(1.277e9 years)
(200 g)/(39.0983 g/mol + 35.453 g/mol)*(Avogadro constant)*(0.0117%)*ln(2)/(1.277e9 years)
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