Question #ef6cd

1 Answer
Ernest Z.
Oct 9, 2017

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"

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