Question

Question #ef6cd

Answer 1

There are `1.40 × 10^25 color(white)(l)"H atoms"`.

Explanation:

The formula of ammonium sulfide is `("NH"_4)_2"S"`.

We see that 1 formula unit of `("NH"_4)_2"S"` contains 2 `"NH"_4` units, and each `"NH"_4` unit contains 4 `"H"` atoms.

Thus,

1 formula unit of `("NH"_4)_2"S"` contains 8 `"H"` atoms

and

1 mol of `("NH"_4)_2"S"` contains 8 mol of `"H"` atoms.

`"H atoms" = 2.90 color(red)(cancel(color(black)("mol" color(white)(l)("NH"_4)_2"S"))) × (8 color(red)(cancel(color(black)("mol H atoms"))))/(1 color(red)(cancel(color(black)("mol" color(white)(l)("NH"_4)_2"S")))) × (6.022 × 10^23color(white)(l) "H atoms")/(1 color(red)(cancel(color(black)("mol H atoms")))) = 1.40 × 10^25 color(white)(l)"H atoms"`