The equation for density is mass/volume. Make sure your units match what is given in the problem.
C) the scientist made an identification by identifying the amount of drug in her blood and realising it was high
Answer:
It is equal to the number of moles of acid that reacted. When Oxalic acid is your limiting reactant it is the # of moles of oxalic acid used. When NaOH is your limiting reactant it is equal to the number of moles of NaOH used.
