Question

How many atoms are in the 3.5 moles of arsenic atoms?

Answer 1

2.1x10^24 I think maybe

Answer 2

Number of atom in one mole = 6.022 × 10²³
So, in 3.5 moles, it would be: = 6.022 × 10²³ * 3.5 = 2.1 × 10²⁴

In short, Your Answer would be 2.1 × 10²⁴ atoms

Hope this helps!