now CH COO balance CH COOH MnO Mn (acidic medium) 4. How many grams of potassium

Question

now CH COO balance CH COOH MnO Mn (acidic medium) 4. How many grams of potassium permanganate are needed to completely oxidize 2g toluene? [MW (toluene) 92, (potassium permanganate) 58] (HINT: Refer to balanced chemical equation on page 12-4.) 5) will the purple color (see problem 4) due to potassium permanganate ever be discharged if 2.0 g of toluene are mixed with 7.3 g (water and NaOH have also been added) and the reaction is heated under reflux for 3 hours? Explain. 6. Will addition of sodium bisulfite necessary (see problem 4) destroy any unreacted potassium permanganate if 2.0 g of toluene are mixed with Pappas and Goicoechea-Pappas 12-10

Explanation / Answer

Solution :-

Mole ratio of the tolune to KMnO4 is 1 : 2

So lets calculate the mass of the KMnO4 needed to react with 2 g tolune

4). (2 g tolune * 1 mol / 92 g ) *(2 mol KMnO4 / 1 mol tolune )*(158 g / 1 mol KMnO4)= 6.87 g KMnO4

So the mass of the KMnO4 needed is 6.87 g

5) The purple color will not be discharged because the required amount of the KMnO4 for the reaction is 6.87 g

But if we use the 7.3 g KMnO4 then excess KMnO4 remain unreactred which will give the purple color to the solution.

6) When the 5 g of KMnO4 is reactred with 2 g tolune then KMnO4 is the limiting reactant so it will get used up completely so no need to add any sodium bisulfite to destroy any KMnO4 because it is not remain in the solution.

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.