Question

Determine the mass in grams of 3.06x10^21 atoms of arsenic.

Answer 1

To determine the mass of the number of atoms, the first step is to convert this number of atoms to moles using Avogadro's number:

`3.06*10^(21)atoms\cdot(1molAs)/(6.022*10^(22)atoms)=0.051molAs`

Convert this amount of moles to grams using the molecular weight of Arsenic:

`0.051molAs\cdot(74.9g)/(1molAs)=3.8199g`

It means that the answer is 3.8199g.