The number of co atoms in 2.2 mil of co

1.325 x 10²⁴ Co atoms

Explanation:

1 mol of any substance is made of 6.022 x 10²³ units, these units could be atoms making up elements of molecules making up a compound.

Therefore 1 mol of the element cobalt is made of 6.022 x 10²³ atoms of Co

so if 1 mol of Co contains - 6.022 x 10²³ atoms of Co

then 2.2 mol of Co contains - 6.022 x 10²³ /mol x 2.2 mol

number of Co atoms in 2.2 mol of Co is - 1.325 x 10²⁴ Co atoms

a corroding iron, if that's one of your choices

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.