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An imaginary element Z has two naturally occurring isotopes, ^3Z and ^4z. ^3Z has a mass of 3.016 amu, and ^4Z has a mass of 4.003 amu.

An imaginary element Z has two naturally occurring isotopes 3Z and 4z 3Z has a mass of 3016 amu and 4Z has a mass of 4003 amu class=

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[tex]\begin{gathered} ^4Z\text{ mass=}4.003\text{ amu} \\ Z\text{ mass= }3.878\text{ amu} \\ percent\text{ }abundance\text{ =}\frac{^4Z\text{ mass}}{Z\text{ mass}}x100 \\ percent\text{ }abundance\text{ =}\frac{4.003\text{ amu}}{3.878\text{ amu}}x100 \\ percent\text{ }abundance\text{ =}103.223\text{ \%} \\ The\text{ percent abundance of }^4Z\text{ is }103.223\text{ \%} \end{gathered}[/tex]

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