4. Cranberries and lingonberries can be stored fresh for a very long time without sugar, as this is facilitated by the presence of a preservative in them.
1) Set the molecular formula of this natural preservative if the mass fractions of the elements in it are: carbon - 68.85%, hydrogen - 4.92%, oxygen - 26.23%. Name it.
2) Write the reaction equation for its preparation by oxidation of potassium permanganate in an acidic medium
3) How is the preservative used?

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.