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If one mole of carbon atoms weighs 12 gr...

If one mole of carbon atoms weighs 12 grams, what is the mass (in grams) of 1 atom of carbon?

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One mole of carbon atoms weighs 12g (Given)
i.e., mass of 1 mole of carbon atoms = 12g
Then, mass of 6.022× 1023 number of carbon atoms = 12g
Therefore, mass of 1 atom of carbon =
`12 div(6.022×10^(23))`
`= 1.9926 × 10^(- 23) g`
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Knowledge Check

  • One mole of carbon atom weighs 12g, the number of atoms in it is equal to, ( Mass of carbon-12 is 1.9926xx10^(-23)g )

    A
    `1.2xx10^(23)`
    B
    `6.022xx10^(22)`
    C
    `12xx10^(22)`
    D
    `6.022xx10^(23)`

  • Calculate the mass (in grams) of a single C-12 atom.

    A
    `1.993xx10^(-23)g`
    B
    `2.875xx10^(-23)g`
    C
    `4.162xx10^(-23)g`
    D
    `3.786xx10^(-23)g`

  • Assertion(A) One atomic mass unit is defined as one twelth of the mass of one carbon-12 atom. Reason(R) Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as standard.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    A is false but R is true
    C
    A is true but R is false.
    D
    Both A and R are false.

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