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Calculate the number of atom in 39.4 g g...

Calculate the number of atom in 39.4 g gold. Molar mass of gold is `197 g "mole"^(-1)`

Text Solution

Verified by Experts

As molar mass of gold is `197 g "mole"^(-1)` , and number of atoms = Avogadro's number `= 6.023 xx 10^(23)`
`:.` no of atoms in `39.4 g` gold = `(6.023 xx 10^(23) xx 39.4)/(197) = 1.2 xx 10^(23)`.
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Knowledge Check

  • Metallic gold crystallizes in the face centered cubic lattice. What is the approximate number of unit cells in 2.0 g of gold ? (Atomic mass of gold is 197 amu)

    A
    `3.06xx10^(11)`
    B
    `6.023xx10^(23)`
    C
    `1.53xx10^(21)`
    D
    `1.25xx10^(22)`

  • Number of atoms in 558.5 g Fe (molar mass Fe= 55.85 g mol^(-1) )

    A
    twice than in 60 g carbon
    B
    `6.023 xx 10^(22)`
    C
    half that of 8g He
    D
    `558.6 xx 6.023 xx 10^(23)`

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