Question

How many moles of hydrogen are needed to prepare 32 moles of ammonia? N2+3H2 -> 2NH3

Answer 1

That equation literally says that if you have 1 molecule of N2 and 3 molecules of H2 you will get 2 molecules of ammonia. But moles is just a number, like a dozen eggs is 12, right? So you could just as easily consider that

1 mole of N2 and 3 moles of H2 give 2 moles of ammonia just like you can say 3 eggs make 1 omelet then 3 dozen eggs must also make 1 dozen omelets, right?

So now that that's squared away, you can see that this acts awfully similar to a math equation. Whatever you do to one side you have to do to the other. So far your "equation" gives you only 2 moles of ammonia, and you need 32.

So how many more times do you need to multiply your moles of ammonia by to get what you want? Multiply that number on the other side since they're equal and see how many moles of Hydrogen it takes you to do that!

Answer 2

um i did it and i got 96 moles of hydrogen is that correct?

Answer 3

Yes almost! Except there's a little extra something that they didn't tell you about. Usually when they say "Hydrogen" what they really mean is really "hydrogen molecules" since practically speaking, you're not going to have hydrogen by itself, so to be specific:

96 Hydrogen ATOMS
48 Hydrogen MOLECULES

and usually people refer to the molecules. There are several other "diatomic molecules" that people refer to, such as Chlorine, which is Cl2.

Answer 4

so all you have to do is to add 96H atom with 48H molecules?

Answer 5

No, 96 H-atoms IS 48 H_2-molecules

Answer 6

OK, How many atoms of hydrogen are present in 32 moles of NH3?

Answer 7

96 ?

Answer 8

Then how many atoms of hydrogen are present in \(n\) moles of H2?

Answer 9

48

Answer 10

yep

Answer 11

Thank you! C;

Answer 12

no problem :)