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chemistry

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how many atoms of chlorine are ther in 87.56 milligrams of barium chlorite?

  • chemistry -

    Barium chlorite is Ba(ClO2)2.
    moles Ba(ClO2)2 in 87.56 mg (0.08756 grams) = grams/molar mass.
    There will be 6.022 x 10^23 atoms Ba(ClO2) in 1 mole Ba(ClO2)2.
    There are two atoms Cl per mole Ba(ClO2)2. Post your work if you get stuck.

  • chemistry -

    ok. so i have:
    Ba 137.33
    2Cl 70.9
    2O 32
    = 240.23

    2Cl 70.9/240.23 Xs 100= 29.51%

    i need mg not g so i convert it 29.51 in mg =0.02951 correct?
    if so i have 0.02951mgCl X 1mol/35.45 X 6.022 X 10 to the 23= 0.00083244 X 6.022= 0.005 X 10 to the 23 power. am i on the correct path?

  • chemistry -

    disregard the last post i meade. i submitted it and i realized i forget to add the87.56 into the work!
    Ba 137.33
    2Cl 70.9
    2O 32
    = 240.23

    2Cl 70.9/240.23 Xs 100= 29.51%

    0.2951 X 87.56mg= 25.84mgCl
    25.84 Xs 1mol/35.45= 0.729 X 6.022= 4.39 X 10 to the 23 power. is that correct?

  • chemistry -

    Megan
    I'm in Mr. Hartzell's class are you?

  • chemistry -

    yes paul i am. im having a blast trying to do this extra credit. how its it going for you?

  • chemistry -

    I have the molar mass of Ba(ClO2)2 = 272.23
    mols Ba(ClO2)2 = 0.08756/272.23 = 3.216 x 10^-4 moles.
    6.022 x 10^23 molecules/mole x (3.216 x 10^-4 moles) = 1.937 x 10^20 molecules Ba(ClO2)2. There are 2 atoms Cl for each molecule of Ba(ClO2)2 so the number of Cl atoms will be just twice the amount of molecules Ba(ClO2)2.

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