Magnesium has three naturally occuring isotopes: 24Mg (23.985 amu) with 78.99% a

Question

Magnesium has three naturally occuring isotopes:
24Mg (23.985 amu) with 78.99% abundance, 25Mg (24.986 amu) with 10.00% abundance, and a third with11.01% abundance. Look up the atomic mass of magnesium, and then calculate themass of the third isotope. Magnesium has three naturally occuring isotopes:
24Mg (23.985 amu) with 78.99% abundance, 25Mg (24.986 amu) with 10.00% abundance, and a third with11.01% abundance. Look up the atomic mass of magnesium, and then calculate themass of the third isotope.

Explanation / Answer

Given abundance of 24 Mg is 78.99%          abundance of 25 Mg is 10.00%         abundanceof another Mg isotope is 11.01% Let the atomic weight of 3 rd isotope be x amu Atomic weight of natural Mg is 24.305
Atomic weight = {( 78.99 * 23.985 ) + ( 10.00 * 24.986 ) + (11.01*x ) }/ 100           24.305 = { 1894.57515 + 249.86 + 11.01* x } / 100 1894.57515+ 249.86 + 11.01* x = 24.305 * 100 x = 25.9823 amu mass of the third isotope= 25.9823 amu

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