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Average molar mass and abundance fractions

Question

Average molar mass and abundance fractions
The relative molar mass of an element is known to be 32.064 g. Determine the abundance fraction of the isotope whose fraction is not displayed in the table.


The relative molar mass of an element is known to be 32.064 g. Determine the abundance fraction of the isotope whose fraction is not displayed in the table.


Isotopes
Fraction Molar Mass (g/mol)
0.950 31.972
0.008 32.971
- 33.968

If you could just help me understand how to properly do this, please.

Answers

relative molar mass = Sum of the products of the masses of the isotope &their percent abundance32.064 = (0.950 x 31.972 ) + ( 0.008 x 32.971 ) +( A x 33.968)Where A is the abundance of the element with molar mass 33.968 g/mol32.064 = 30.37 + 0.264 + 33.968 A33.968 A = 1.43A = 0.042Therefore the abundance fraction is 0.042


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