The pretend element, knoxium, Kx, has the following composition: 164Kx, 164.08 amu (60.44%)
165Kx, 165.11 amu (13.55%)
169Kx, 168.92 amu (%)
What is the average atomic mass of the "knoxium"?

164.08amu
165.48amu
166.04 amu

165.48 amu

Explanation:

First, you need to find the last percentage.

100% = 60.44% + 13.55% + x

100% = 73.99% + x

x = 26.01%

Now, multiply each mass by the respective percentage.

164.08 × 0.6044 = 99.17

165.11 × 0.1355 = 22.37

168.92 × 0.2601 = 43.94

Lastly, add the products together to find the average atomic mass.

99.17 + 22.37 + 43.94 = 165.48

The average atomic mass of "knoxium" is 165.48 amu

samuel de champlain. in 1608, king henry iv sponsored pierre dugua, sieur de mons and samuel de champlain as founders of the city of quebec with 28 men. this was the second permanent french settlement in the colony of canada.