There are two isotopes of an element with atomic mass z. Heavier on has atomic mass z+2 and lighter one has z-1, then abundance of lighter one isA. `66.6%`B. `96.7%`C. `6.67%`D. `33.3%`

There are two isotopes of an element with atomic mass z. Heavier on ha

1.	There are two isotopes of an element with atomic mass z. Heavier on has atomic mass z+2 and lighter one has z-1, then abundance of lighter one isA. `66.6%`B. `96.7%`C. `6.67%`D. `33.3%`
Answer» Correct Answer - A Let percent abundance of lighter isotope = x `:. (x(z-1)+(100-x)(z+2))/(100)=z` `xz-z+100z+200-xz-2x=100z` `-3x = -200` `x = (200)/(6) = 66.6` `:.` percent abundance of lighter isotopes = x

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There are two isotopes of an element with atomic mass z. Heavier on has atomic mass z+2 and lighter one has z-1, then abundance of lighter one isA. `66.6%`B. `96.7%`C. `6.67%`D. `33.3%`

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