Chemistry, 06.04.2021 03:40 jacobrobles755
The element Yttrium (Y) is often used as an internal standard in atomic emission (AES) measurements to account for sample-to-sample variability. A standard mixture containing 10.00 ppb Y and 20.00 ppb of Pb gave signals of 12,163 (Y) and 15,459 (Pb). A mixture with a volume of 10.00 mL was prepared by mixing 5.00 mL of unknown water with 5.00 mL of 25.00 ppb Y. This sample gave signals of 10,563 (Y) and 6177 (Pb). What is the concentration of Pb in the unknown water
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The activation energy for this reaction is 75 kj·mol–1. the enzyme catalase (found in blood) lowers the activation energy to 8.0 kj·mol–1. at what temperature would the non-catalyzed reaction need to be run to have a rate equal to that of the enzyme-catalyzed reaction at 25°c?
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The element Yttrium (Y) is often used as an internal standard in atomic emission (AES) measurements...
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