Don't get the setup or answer of moles?

Question

The active agent in many hair bleaches is hydrogen peroxide. The amount of hydrogen peroxide in 17.0 g of hair bleach was determined by titration with a standard potassium permanganate solution.
2 MnO4-(aq) + 5 H2O2(aq) + 6 H+(aq) 5 O2(g) + 2 Mn2+(aq) + 8 H2O(l)

(a) How many moles of MnO4- were required for the titration if 43.4 mL of 0.109 M KMnO4 was needed to reach the end point?
mol
(b) How many moles of H2O2 were in the sample?
mol

Answer 1

a. For this part, you don't need to fool with the chemical equation itself, you just have to understand the definition of molarity.....

A 0.109M KMnO4 solution contains 0.109 mols KMnO4 per Liter, so if 43.4 mL of solution were used, that gives:

(0.109 mol/L * 0.0434 L) = 4.7306 x 10^-3 mols KMnO4 =
4.7306 x 10^-3 mols MnO4^-

b. From the equation, you know that 5 mols H2O2 are needed for every 2 mols of MnO4^-. This gives an answer of:

4.7306 x 10^-3 mols MnO4^- * (5 mols H2O2/2 mols MnO4^-) = 1.18265 x 10^-2 mols H2O2 in the sample

Answer 2

one million) in case you spend one million funds an afternoon, how some years might it take to spend one mole of greenbacks? one million million is one million x 10^6, divide one million mole via one million million/day, then divide days via 365 to get your form of years. 2)what share moles of pencil marks are you able to're making in one minute? comparable via fact the single earlier yet in opposite. Time one minute to work out what share pencil marks you're making. Then divide the form of pencil marks via 6 x 10^23. you will get an extremely small quantity. 3) If the exterior element of the Pacific Ocean is one million.6576 x 10^8 sq. km and the common intensity is 4,028 meters, what share moles of water are interior the Pacific? (hint:18 cm= one million mole H2O) i anticipate you mean 18 cm^3 = one million mole H20. Take the exterior section and multiply via intensity to locate the common quantity of the sea. at 18 cm^3 per mole H20, divide the finished quantity via 18 cm^3 to locate moles H20. do no longer forget to transform cm^3 into km^3. 4) If the common penny is two mm thick, how a techniques in the direction of the sunlight might a stack of one million mole of pennies attain? multiply 2mm via 6 x 10^23 to get the finished mms. that would desire to be adequate, even nevertheless it rather is advisable to transform to kms. wish this permits.