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The ratio of the mass of C-12 atom to th...

The ratio of the mass of C-12 atom to that of an atom of element X (whose atomicity is four) is `1:9`. The molecular mass of element x is :-

A

`"480 g mol"^(-1)`

B

`"43.2 g mol"^(-1)`

C

`"36 g mol"^(-1)`

D

`"84 g mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`"Molecular mass "=("weight of molecule")/("weight of "(1)/(12)"th part of C"-"12 atom")`
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Knowledge Check

  • Isotopes are the atoms of same element, they have same atomic number but different mass numbers. Isotopes have different number of neutrons in their nucleus . If an element exists in two isotopes having atomic masses 'a' and 'b' in the ratio m:n, then average atomic mass will be (mxxa+nxxb)/(m+n) Different isotopes of same element have same position in the periodic table. the elemens which have single isotope are called monoisotropic elements. Greater is the percentage composition of an isotope, more will be its abundance in nature. The ratio of mass of .^(12)C atom to that of an atom of element X(whose atomicity is four) is 1:9. the molecular mass of element X is:

    A
    480 g `"mol"^(-1)`
    B
    `432g "mol"^(-1)`
    C
    `36 g "mol"^(-1)`
    D
    `84g "mol"^(-1)`

  • Atomic mass of an element is

    A
    actual mass of one atom of the element
    B
    average relative mass of different atoms of the element
    C
    relative mass of an atom of the element
    D
    always a whole number

  • Atomic mass of an element is

    A
    actual mass of one atom of the element
    B
    average relative mass of different atoms of the element
    C
    relative mass of an atom of the element
    D
    always a whole number

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