A new element is discovered.It has two isotopes.The relative abundance of the isotopes and their masses are 18% isotope 1,mass 350.0 u and 82% isotope 2,mass 352.0 u.What is the atomic mass of the element?
A)351.6
B)351.0
C)350.4
D)352.0
E)350.0

Question

Quizplus · Accepted Answer

The atomic mass of the element can be calculated using the formula: (abundance of isotope 1 * mass of isotope 1) + (abundance of isotope 2 * mass of isotope 2), then dividing by 100 if the abundances are in percentages. For this element, it's (18% * 350.0 u) + (82% * 352.0 u) = 63 + 288.64 = 351.64 u, which rounds to 351.6 u.

A New Element Is Discovered