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Carbon found nature as a mixture of C-12...

Carbon found nature as a mixture of C-12 and C-13. The average atomic mass of carbon is 12.011u. What is the percentage abundance of carbon-12 in nature ?

Text Solution

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The correct Answer is:
`98.9%`
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Carbon occurs in nature as a mixture of carbon-12 and carbon-132. the average atomic mass of carbon is 12.011. what is the percentage abundance of carbon -12 in nature?

The element bron occurs in nature as two isotopes havein atomic masses 10 u and 11 u . What are the percentage abundances of these isotopes in a sample of boron having average atomic mass of 10.8 u?

Knowledge Check

  • Carbon occur in nature as a mixture of C-12 and C-13 . Average atomic mass of carbon is 12.011 what is the % abundance of C-12 in nature ?

    A
    `98.9%`
    B
    `60.9%`
    C
    `32.9%`
    D
    `1.4%`

  • (1)/(12)th gm atom of carbon

    A
    contains 1 atom of carbon
    B
    contains Avogadro number of carbon
    C
    corresponds to one mole of carbon
    D
    corresponds to 1 a.m.u.

  • This section contains Assertion (A) One atomic mass unit is defined as one twelfth 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 Assertion and Reason are correct and Reason is the correct explanation of the Assertion
    B
    Both Assertion and reason are correct but Reason is not the correct explanation of Assertion
    C
    Assertion is correct but Reason is incorrect.
    D
    Both Assertion and Reason are incorrect

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