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1. (4 pts total) The mass of Earth's atmosphere is approximately 5.27 x 10¹8 kg or 5.27 x 106 gigatonnes (Gt). Given that the concentration of CO₂ in the atmosphere has increased from 280 ppm in the 18th century to approximately 410 ppm, today, estimate the increase in the mass of carbon in the atmosphere over this time period. (Hint: start by converting the mass of the atmosphere to total moles of air in the atmosphere).

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