Chemistry, 13.05.2021 18:40 shantrice1831

Please help! The active volcano Mauna Loa, in Hawaii, and the now-extinct volcano El Yunque, Puerto Rico, have certain basaltic lava rocks containing the element selenium. Typically, a 25.0 g rock contains 0.005 g of selenium. What is the concentration of selenium in these lava rocks, in ppm

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