(Solved): 4. What is the molarity of a potassium permanganate, KMnO4, solution that is made from 0.798g ...

4. What is the molarity of a potassium permanganate, $${\mathrm{KMnO}}_4$$, solution that is made from $$0.798\mathrm{g}$$ of $${\mathrm{KMnO}}_4$$ in $$50.0\mathrm{mL}$$ ? 5. Formalin is an aqueous solution of formaldehyde, $$\mathrm{HCHO}$$, used as a preservative for biologic specimens. How many grams of formaldehyde must be used to prepare $$2.5\mathrm{L}$$ of $$12.3\mathrm{M}$$ formalin? 6. How many milliliters, $$\mathrm{mL}$$, of $$0.126\mathrm{M}{\mathrm{HClO}}_4$$ are required to give $$0.102\mathrm{mol}{\mathrm{HCO}}_4$$ ?