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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

Verified by Experts

It is `1.992648 xx 10^(-23) g ~~ 1.99 xx 10^(-23)g`
It can be obtained by dividing gram atomic mass of carbon (12 g) with Avogadro's No. `(N_(A))`
`((12g))/(6.022xx10^(23))~~1.99xx10^(-23)g`.
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What will be the mass of one ""^(13)C atoms in g?

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)

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.

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

  • 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.