Element Z has 2 isotopes. A sample of element Z contains 19% Z234 and 81% Z236. What is the average atomic mass of the element Z?

Wt Avg of the two isotopes = 235.62 amu

Explanation:

Given:

                                    abundance

Isotope     %      fractional     mass (amu)         Wt. Avg. Contributions

Z234        19%        0.19              234                (0.19)(234) = 44.46 amu

Z236        81%        0.81              236                (0.81)(236) = 191.16 amu

Collective Wt. Avg. of all isotopes = ∑ Wt. Avg. Contributions

= 44.46 amu + 191.16 amu = 235.62 amu

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