how many grams of potassium dichromate are required to prepare 250 mL solution whose concentration is 2.16 M

Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Which proportionality applies to avogadro’s law?