Which process of a volume of solution of known concentration to determine the concentration of another solution

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 reaction is taking place? 02 + c3h8 = h20 + co2

Find the mass in grams of 1.37x1020 particles of h3po4