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First Order Reaction

26. An elemen...

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26. An element (x) exist in two isotopic forms x80 and x82. If the percentage abundance of the lighter isotope is 40% then the average atomic mass of x is?

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X

has two isotopes,

^{56} X

^{58} X

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

Q. The average atomic mass of an element is calculated by its isotopic percentage but what if the average atomic mass is given and we have to find the percentage of a isotopes??
eg:- average atomic mass of an element exist 16.2 u. What is the percentage of isotopes
16. . 18
. X. X
8. 8

Q. If an element

X

exists in its two isotopic form

_{17}^{35} X (75 %)

_{17}^{37} X (25 %)

. The average atomic mass of element

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Q. Average atomic weight of boron is

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and boron exists in two isotopic forms

B^{10}

B^{11}

. The percentage abundance of

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Q. The atomic masses of two isotopes of an element are 16 and 17 respectively. Their percentage abundances are 25% and 60% respectively and the average atomic mass of the element is 16.90. If the element has 3 isotopes, calculate the atomic mass of the third isotope.

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