Question

A new element is found named noworksheetsium. there are two isotopes of noworksheetsium which are noworksheetsium-85 and noworksheetsium-87. noworksheetsium-85 makes up 87.6% of all of noworksheetsium. what is the atomic mass of noworksheetsium.

1) 12.4%
2) 87.6%
3) 100%
4) Cannot be determined

Answer 1

To find the atomic mass of Noworksheetsium, multiply the mass of Noworksheetsium-85 by its abundance (87.6%) and add it to the mass of Noworksheetsium-87 multiplied by its abundance (12.4%).

Step-by-step explanation:

The atomic mass of an element is the weighted average of the masses of its isotopes. In this case, there are two isotopes of Noworksheetsium: Noworksheetsium-85 and Noworksheetsium-87. Noworksheetsium-85 makes up 87.6% of all Noworksheetsium. To find the atomic mass of Noworksheetsium, multiply the mass of Noworksheetsium-85 by its abundance (87.6%) and add it to the mass of Noworksheetsium-87 multiplied by its abundance (12.4%).

Thus, the atomic mass of Noworksheetsium is 87.6% multiplied by the mass of Noworksheetsium-85 plus 12.4% multiplied by the mass of Noworksheetsium-87.

Atomic mass of Noworksheetsium = (87.6% x mass of Noworksheetsium-85) + (12.4% x mass of Noworksheetsium-87).