Question #ef6cd

1 Answer
Oct 9, 2017

Answer:

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"#