26.Copper 63 and copper 65 has average atomic mass of 63.546u. % nature abundance of lighter isotope of copper will be

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1)copper has two naturally occurring isotopes copper 63 has an atomic mass of 62. 9 296 u and an abundance of 69. 1 5% what is the atomic mass of the second isotopic if the average atomic weight of copper is 63?

Q. An element

X

has two isotopes,

^{56} X

and

^{58} X

. If the natural abundance of lighter isotope is 20% than the average atomic mass of the element is:

Q. A naturally occuring sample of copper consists of 69.2% of

^{63} C u

and 30.8% of

^{65} C u

. The relative mass of

^{63} C u

is 62.93 and that of

^{65} C u

is 64.93. Find the atomic mass of a naturally occuring sample of copper.

C u

has only two naturally occurring isotopes,

63_{C u}

and

65_{C u}

. If the atomic mass of

C u

63.546

, then the natural abundance of the

^{63} C u

isotope will be approximately :

Q. An element has the following natural abundances and isotopic masses: 90.92% abundance with

19.99 amu

, 0.26% abundance with

20.99 amu

and 8.82% abundance with

21.99 amu

. Calculate the average atomic mass of this element.

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