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    M A Grams, Where A Is The Mass Nucleonnumber of The Element

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    Michael Leung
    One mole of any substance contains 6.02 x 10^23 particles. The mass of one mole of a substance is equal to the molar mass of that substance measured in grams. To calculate the number of moles in a substance, we take the mass of the substance divided by the molar mass. This allows us to then calculate the number of particles in the substance by multiplying the number of moles by Avogadro's constant.

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    M A Grams, Where A Is The Mass Nucleonnumber of The Element

    Uploaded by

    Michael Leung
    33 views1 page
    One mole of any substance contains 6.02 x 10^23 particles. The mass of one mole of a substance is equal to the molar mass of that substance measured in grams. To calculate the number of moles in a substance, we take the mass of the substance divided by the molar mass. This allows us to then calculate the number of particles in the substance by multiplying the number of moles by Avogadro's constant.

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    Mole

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    One mole of any substance contains 6.02 x 10^23 particles. The mass of one mole of a substance is equal to the molar mass of that substance measured in grams. To calculate the number of moles in a substance, we take the mass of the substance divided by the molar mass. This allows us to then calculate the number of particles in the substance by multiplying the number of moles by Avogadro's constant.

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    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    33 views1 page

    M A Grams, Where A Is The Mass Nucleonnumber of The Element

    Uploaded by

    Michael Leung
    One mole of any substance contains 6.02 x 10^23 particles. The mass of one mole of a substance is equal to the molar mass of that substance measured in grams. To calculate the number of moles in a substance, we take the mass of the substance divided by the molar mass. This allows us to then calculate the number of particles in the substance by multiplying the number of moles by Avogadro's constant.

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    One mole of any substance is the amount of the substance containing same number of

    particles as in 12 g of C–12 or Avogadro constant = NA = 6.02 × 1023


    particles/atoms/molecules

    Avogadro constant is the number of particles in a mole of a substance

    Mass of one mole of an element = molar mass of element =


    M = A grams , where A is the mass∨nucleonnumber of the element

    e.g C-12, M =12g

    U-235, M = 235 g

    Na -23, M= 23 g

    Fe – 56, M =56 g

    Number of moles in a substance = n


    Mass of substance = m
    Molar mass of substance = M
    Number of particles (atoms or molecules) in the substance = N

    m N
    n= ∨
    M NA

    Ex1 A solid iron cube of side 20 mm has a mass of 63 g. The molar mass of iron is 56 g.
    (a) How many iron atoms are there in the cube?
    (b) Hence find the maximum volume that an iron atom could occupy in the solid state.
    (c) Use your answer to (b) to estimate the diameter of the iron atom.

    mass of solid iron cube 6.3 ×10−2 kg


    n= = =1.125moles
    molar mass 5.6 ×10−2 kg
    Number of atoms in the cube = n N A =6.77 ×1023

    volume of cube
    Maximum volume of one atom of iron = =1.18 × 10−29 m3
    number of iron atoms

    Assuming that an iron atom occupies a cube of length d


    d 3=1.18 × 10−29
    d=2.3× 10−10 m

    Ex 2 The viscous (drag) force F on a sphere of radius r moving steadily with speed v in a
    fluid of viscosity is given by F=6 πr v. Find the SI unit for and express the SI unit in terms
    of base units.

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