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Question: the continental crust contains platinum with an average 15 ppb...

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The continental crust contains platinum with an average 1.5 ppb (part per billion) and lanthanum 31 ppm (parts per million)(Rudnick and Gao, 2014 in Treatise on Geochemistry). The content of SiO2 of the upper crust is 66.62 wt%. Q 2-1. What is the number of platinum and lanthanum atoms in 100 gram of a rock that has an average continental crustal composition? Q 2-2. What is the atomic ratios of Si to platinum and lanthanum? Q 2-3. How many atoms of platinum and lanthanum are present in a crustal rock containing 106 atoms of Si?

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