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How many gold atoms are in an 0.408 ounce, 18 gold bracelet? (18 gold is 75% gold by mass.)

  • chem -

    Steps are

    0.408 oz x 0.75 give masss of gold

    convert the mass in oz to mass in g (say =X)

    Look up molar mass for gold (say =M)

    number of moles of gold is then

    X/M

    If Avogadro's Number =N (number of atoms per mole)

    then the number of atoms is

    XN/M

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