Chemistry 400/ Chem 1A

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A chemist mixes 5.216 g of potassium permanganate, 2.318 g of ethanol, and excess sulfuric acid. These chemicals react as follows:

4 KMnO4 + 5 C2H5OH + 6 H2SO4 ---> 4 MnSO4 + 5 CH3COOH + 2 K2SO4 + 11 H20

What mass of sulfuric acid is consumed in this reaction, assuming that the reaction goes to completion?

  • Chemistry 400/ Chem 1A -

    mols KMnO4 = grams/molar mass = approx 0.033 but you need to this and all of the calculations that follow more accurately.
    mols ethanol = approx 0.05
    Convert mols KMnO4 to mols H2SO4. That's 0.033 x 6/4 = 0.05
    Convert mols ethanol to mols H2SO4. That's 0.05 x 6/5 = 0.06
    The limiting reagent is KMnO4 and you will use approx 0.05 mols H2SO4
    Then convert mols H2SO4 to grams. g = mols x molar mass.
    Check my work.

  • Chemistry 400/ Chem 1A -

    I got 4.854 g of H2SO4. Thank you so much.
    I did it right the first time just has trouble understanding the problem in my head.

    To find grams of excess reactant I just have to convert moles of ethanol to g right?

  • Chemistry 400/ Chem 1A -

    excess mol ethanol x molar mass ethanol = grams ethanol in excess

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