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What will be the mass of one .^(12)C ato...

What will be the mass of one `.^(12)C` atom in `g`?

Text Solution

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1 mole of C-12 atoms = 12 g `=6.022xx10^(23)" atoms"`
Thus, `6.022xx10^(23)` atoms of C-12 have mass = 12 g
`therefore" 1 atom of C-12 will have mass"=(12)/(6.022xx10^(23))g=1.9926934g.`
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Knowledge Check

  • The mass of one C atom is:

    A
    `6.023 xx 10^(23) g`
    B
    `1.99 xx 10^(-23) g`
    C
    `2.00 g`
    D
    12 g

  • Assertion : One atomic mass unit is defined as one twelfth of the mass of one C-12 atom. Reason : C-12 is the least abundant isotope of carbon and has been choosen as the standard.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false

  • Atoms of elements A, B and C combine to form a compound in the atomic ratio of 1 : 6 : 2 . Atomic masses of A, B and C are 64, 4 and 16 respectively. What will be the maximum mass of a compound formed from 1.28 g of A, 3xx10^(23) atoms of B and 0.04 moles of C ?

    A
    12 g
    B
    24 g
    C
    2.4 g
    D
    0.12 g

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    One mole of element X has 0.444 times the mass of one mole of element Y. One atom of element X has 2.96 times the mass of one atom of .^(12)C . What is the atomic mass of Y ?

    1 amu = (1)/(12) the mass of one C-12 atom .

    If 1 g of sodium carbon contains x atoms, what will be the number of atoms in 1 g of magnesium ? (C= 12u, Mg = 24 u)

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    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.

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