September 13, 2024, 09:14:28 PM
Forum Rules: Read This Before Posting

### Topic: finding how many molecules of hydrogen were used?  (Read 4221 times)

0 Members and 1 Guest are viewing this topic.

#### monique2302

• Very New Member
• Posts: 2
• Mole Snacks: +0/-0
##### finding how many molecules of hydrogen were used?
« on: January 16, 2011, 03:12:58 PM »
Ammonia is produced from its elements in a formation reaction. If 1.50 x 10^25 molecules of ammonia are produced, how many molecules of hydrogen were used?

So do I have to find how many moles there are first to find how many molecules their are?

#### rabolisk

• Chemist
• Full Member
• Posts: 494
• Mole Snacks: +45/-25
##### Re: finding how many molecules of hydrogen were used?
« Reply #1 on: January 16, 2011, 03:25:58 PM »
Try to attempt the question first, and I can help you along the way.

#### AMEDIO

• Regular Member
• Posts: 46
• Mole Snacks: +2/-4
##### Re: finding how many molecules of hydrogen were used?
« Reply #2 on: January 17, 2011, 04:53:04 AM »
yup

#### sci994

• Regular Member
• Posts: 25
• Mole Snacks: +0/-3
##### Re: finding how many molecules of hydrogen were used?
« Reply #3 on: January 17, 2011, 06:19:05 AM »
You know the reaction?
It's 3H2+N2 :rarrow:2NH3.

You calculate the mols of ammonia, then you calculate number of mols of hydrogen and ten you calculate the number of molecules.

N(number of molecules)=NA*n