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A piece of copper weighs 0.635 g. How ma...

A piece of copper weighs 0.635 g. How many atoms of copper does it contain?

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Gram atomic mass of copper = 63.5 g Number of moles in 0.635 g of copper `=0.635/63.5 = 0.01` moles
Number of copper atoms in one mole = `6.022 xx 10^(23)`
Number of copper atoms in 0.01 moles
`=0.01 xx 6.022 xx 10^(23) = 6.022 xx 10^(21)`
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A piece of copper weighs 0.634g. How many atoms of copper does it contain?

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Knowledge Check

  • The Statue of Liberty is made of 2.0 xx 10^(5) lbs of copper sheets bolted to a framework (1 lb = 454 g) How many atoms of copper are on the statue? (Atomic weight: Cu = 63.5).

    A
    `2.1 xx 10^(27)`
    B
    `8.6 xx 10^(29)`
    C
    `4.3 xx 10^(26)`
    D
    `8.6 xx 10^(26)`

  • The equivalent mass of chlorine is 35.5, and the molar mass of copper is 63.5. The equivalent mass of copper chloride is 99.0. Hence, formula of copper chloride is

    A
    `CuCl`
    B
    `Cu_(2)Cl`
    C
    `CuCl_(2)`
    D
    None of these

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