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nlexa [21]
3 years ago
5

fictitious element Jz has two common isotopes. Three-fifth of the isotopes have a mass of 329.1 amu, while the rest have a mass

of 334.5 amu. Given this information what is the average atomic mass (in amu) of Jz? Report the answer to 4 significant figures
Chemistry
1 answer:
Alla [95]3 years ago
7 0

The average atomic mass of Jz is 331.3 u.

The average atomic mass of Jz is the <em>weighted average</em> of the atomic masses of its isotopes.

We multiply the atomic mass of each isotope by a number representing its <em>relative importance</em> (i.e., its fractional abundance).  

Thus,

⅗ × 329.1 u = 197.46  u

⅖ × 334.5 u = <u>133.80 u</u>

      TOTAL = 331.3   u

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