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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: monique2302 on January 16, 2011, 03:12:58 PM

Title: finding how many molecules of hydrogen were used?
Post by: monique2302 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?

Title: Re: finding how many molecules of hydrogen were used?
Post by: rabolisk on January 16, 2011, 03:25:58 PM

Try to attempt the question first, and I can help you along the way.

Title: Re: finding how many molecules of hydrogen were used?
Post by: AMEDIO on January 17, 2011, 04:53:04 AM

yup :)

Title: Re: finding how many molecules of hydrogen were used?
Post by: sci994 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)=N_A*n