Calculate the number of atoms in each of the following
a. `52 mol` of `He`
b. `52 u` of `He`
c. `52 g` of `He`

Explanation

(i) `"1 mole of He"=6.022xx10^(23)" atoms"`
`therefore" 52 mol of He"=52xx6.022xx10^(23)" atoms"=3.131xx10^(25)" atoms"`
(ii) `"1 atoms of He = 4 u of He"`
`" 4 u of He = 1 atom of He"`
`therefore" 52 u of He"=(1)/(4)xx" 52 atoms = 13 atoms"`
(iii) `"1 mole of He = 4 g "=6.022xx10^(23)" atoms"`
`therefore" 52 g of He "=(6.022xx10^(23))/(4)xx" 52 atoms"=7.8286xx10^(24)" atoms"`