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Earth's surface area is 5.10 x 10^8 km^2; its crust has a mean thickness of 35km and a mean density of 2.8 g/cm^3. The two most abundant elements in the crust are oxygen (4.55 x 10^5 g/t, where t stands for metric ton; 1ton = 1000 kg) and silicion (2.72 x 10^5 g/t), and the two rarest nonradioactive elements are ruthenium and rhodium, each with an abundance of 1 x 10^-4 g/t. What is the total mass of each of these elements in Earth's crust?

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