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Due in class on Tuesday, October 17, 2017 1. (4 points) Vitamin B12.cyanocobalamin, contains the element cobalt (Co); each molecule of B12 contains one Co atom. A sample of B12 was found to contain 4.38% Co. What is the molecular mass of Vitamin B12? 2. (4 points) A 20.0 g sample of HF is dissolved in water to produce 255 mL of solution. What is the molarity of the resulting solution? 2o Molnut 3.(4 points) What mass of Naoll (o) is required to react (Le, the stoichiometrically equivalent amount) completely with 25.0 nal, of 1.25 M H2SO4 (ai)?
here are clearer pictures of those two questions
Due in class on Tuesday, October 17, 2017 1. (4 points) Vitamin B12.cyanocobalamin, contains the element cobalt (Co); each molecule of B12 contains one Co atom. A sample of B12 was found to contain 4.38% Co. What is the molecular mass of Vitamin B12? 2. (4 points) A 20.0 g sample of HF is dissolved in water to produce 255 mL of solution. What is the molarity of the resulting solution? 2o Molnut 3.(4 points) What mass of Naoll (o) is required to react (Le, the stoichiometrically equivalent amount) completely with 25.0 nal, of 1.25 M H2SO4 (ai)?
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Jamar FerryLv2
13 Jul 2019
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