• Chemistry Archive: Questions from 2024-06-3

    Earth's oceans have an average depth of 3800 m, a total area of 3.63×108 km2, and an average concentration of dissolved gold of 5.8×10−9 g L. If a recent price of gold was $239.00 troy oz , what is the value of gold in the oceans? ( 1 troy oz = 31.1 g) Be sure your answer has the correct number of significant figures. Note: Reference the SI prefixes and Unit conversions for derived SI units tables for additional information.
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    A fictitious element has two isotopes and a molar mass of 82.50 g/mol. The first isotope has an atomic mass of 81.00 u and 25.75% of the atoms of this element are of this isotope. What is the atomic mass (in u) of this second isotope? Your Answer: Answer
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