To calculate the average atomic mass of element Z, we need to consider the relative abundance of each isotope and their respective atomic masses.
Given: Isotope Z-234: Relative abundance = 19% = 0.19 Atomic mass of Z-234: Let's denote it as A-234 Isotope Z-236: Relative abundance = 81% = 0.81 Atomic mass of Z-236: Let's denote it as A-236
To find the average atomic mass, we use the formula:
Average atomic mass = (Relative abundance of Z-234 * Atomic mass of Z-234) + (Relative abundance of Z-236 * Atomic mass of Z-236)
Let's assume A-234 and A-236 are the atomic masses of isotopes Z-234 and Z-236, respectively.
Average atomic mass = (0.19 * A-234) + (0.81 * A-236)
However, we do not have the specific atomic masses for isotopes Z-234 and Z-236, so we cannot calculate the exact average atomic mass without that information. You would need to provide the atomic masses of Z-234 and Z-236 to determine the average atomic mass of element Z accurately.