Chemistry

I have .8ml of 35% by weight hydrogen peroxide. The hydrogen peroxide density is 1.14 g/ml. how many moles of hydrogen peroxide are there?

  1. 👍 0
  2. 👎 0
  3. 👁 1,232
  1. You want to calculate the molarity of the H2O2.
    35% w/w means 35 g H2O2/100 g solution.
    Since mass = volume x density, then volume = mass/density = 100g/1.14 = about 87.7 mL.
    mols in 35 g = 35/about 34) = about 1 mol
    M = mols/L = about 1/0.0877 = ?
    Then mols in 0.8mL = M x L.
    Don't forget to convert 0.8 mL to L.

    1. 👍 0
    2. 👎 0
  2. how many moles are in 4.6ml of 48% HBR? The 48% is by weight. I am not given the density this time.

    1. 👍 0
    2. 👎 0
  3. I don't believe it can be done without the density. I think 48% w/v can be done without density but not w/w.

    1. 👍 0
    2. 👎 0
  4. Thank you.
    So it is w/v vs w/w that makes the difference

    1. 👍 0
    2. 👎 0
  5. In this case yes.
    If 48% w/v, that means 48g HBr/100 mL solution so 4.6 mL will have
    48 g HBr x (4.6 mL/100 mL) = ? g and that gives grams in the volume you want which can be convert to mols by mol = g/molar mass. The problem with w/w is that you have no way of knowing how much the 4.6 mL weighs. With density you have a way of converting volume to weight. You have volume in w/v solutions and no conversion is necessary.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Determine the molarity of a 15.0 % by mass Hydrogen Peroxide solution. The density of Hydrogen Peroxide is 1.054 g/mL. The 15.0% by mass can be broken apart into 15.0 g Hydrogen Peroxide and 100.0 g solution. Use the density of

  2. chemistry

    2mno4 - + 5h2o2 + 6h= 2mn 2+ + 5o2(gás) + 8h2o You must determine the percentage of hydrogen peroxide (H2O2) in a solution by permangan titration. In an acid solution, the permanganations will oxidize hydrogen peroxide to oxygen

  3. CHE1

    Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2(l) → 2H2O(l) + O2(g) ΔH = -196 kJ Calculate the value of q (kJ) in this exothermic reaction when 4.60 g of hydrogen peroxide

  4. Physics

    How many atoms of hydrogen are in 220g of hydrogen peroxide (H2O2)? the molecular weight of H2O2 = 2*1 +2*16 =34 therefore, there are 220/34 moles of the molecule = 6.47 moles, so there are 6.47xAvogadro's number of molecules

  1. AP Chem

    A solution of hydrogen peroxide, H2O2, is titrated with a solution of potassium permanganate, KMnO4. It requires 51.7 mL of 0.145 M KMnO4 to titrate 20.0 g of the solution of hydrogen peroxide. What is the mass percentage of H2O2

  2. Microbiology

    "people with takahara's disease don't produce catalase. Although often asymptomatic, this condition can lead to recurrent oral infections by peroxide-generating bacteria. How would you diagnose a catalase deficiency?" Would the

  3. AP Chemistry

    a student titrates three samples of 0.3% hydrogen peroxide solution made from a bottle of 3% hydrogen peroxide solution dated 10/31/2007. would you expect the calculated molarities of the samples to be higher or lower than the

  4. Chemistry

    The following reaction represents the decomposition of hydrogen peroxide 2H2O2 -> o2 (g) + 2H2O (l) How many molecules of water are produced from the decomposition of 3.4g of Hydrogen peroxide, H2O2? Please walk me through this

  1. Chemistry

    Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, , can be titrated against a solution of potassium permanganate, . The following

  2. Chemistry

    Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2+H2SO4 -> BaSO4 +H2O2 How many milliliters of 3.50 M H2SO4(aq) are needed to react completely with 12.1 g of BaO2(s)?

  3. Chemistry

    How to prepare 100mL of 3% w/w Hydrogen Peroxide from 30% w/w Hydrogen Peroxide?Specific Gravity of 30%w/w Hydrogen Peroxide is 1.11g/mL. Can you please show the calculation steps? Thanks.

  4. Chemistry

    a 5.000ml aqueous sample containing hydrogen peroxide as diluted to 25ml and analyzed by titration with permanganate. 2MnO4- + 5H2O + 6H+ --> 5O2 + 2Mn^2+ + 8H2O The sample required 42.8 mL of 0.0175 M permangante to reach the end

You can view more similar questions or ask a new question.