Question

An unknown element sample has 3 isotopes present. The first isotope has a mass of 23.98 amu and is

78.7% abundant. The second has a mass of 24.98 amu and abundance of 10.13%. The last isotope has
a mass of 25.93 amu and an abundance of 11.17%.

Answer 1

24.29 amu

Step-by-step explanation:

Atomic mass of the unknown element

23.98 x .787 + 24.98 x .1013 + 25.93 x .1117

= 18.87 + 2.53 + 2.89

24.29 amu.