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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: whittfred on August 14, 2007, 09:57:41 PM

Title: Can someone help me figure this out?
Post by: whittfred on August 14, 2007, 09:57:41 PM
I Have to use this equation:  N2+ 3H2=2NH3 to answer the question

The question states:  If 2.0 moles of N2 reacts completly, how many grams of NH3 will be produced?  I came up with 4.0g. But I don't think its correct.

"PLEASE HELP"
Title: Re: Can someone help me figure this out?
Post by: macman104 on August 14, 2007, 10:58:28 PM
uhh.....you mean, 4 moles?  You need to covert that to grams, 2 moles of N2 creates 4 moles of NH3.  Not 4 grams.
Title: Re: Can someone help me figure this out?
Post by: profmsg on August 15, 2007, 07:15:27 AM
yeh your right. but your unit for NH3 is not correct should be moles... if you want your answer in grams just convert 2 mole of N2 into gram and multiply by 2 ....
Title: Re: Can someone help me figure this out?
Post by: DrCMS on August 15, 2007, 10:02:00 AM
Quote from: profmsg on August 15, 2007, 07:15:27 AM
yeh your right. but your unit for NH3 is not correct should be moles... if you want your answer in grams just convert 2 mole of N2 into gram and multiply by 2 ....

No they wanted the weight of ammoina produced from 2 moles of nitrogen not the weight of 4 moles of nitrogen.

2N2 + 3H2 -> 4NH3

2 moles of nitrogen give 4 moles of ammonia which weigh 72g in total (4x18 = 72)
Title: Re: Can someone help me figure this out?
Post by: wilson on August 15, 2007, 12:59:25 PM
Quote from: DrCMS on August 15, 2007, 10:02:00 AM
No they wanted the weight of ammoina produced from 2 moles of nitrogen not the weight of 4 moles of nitrogen.

2N2 + 3H2 -> 4NH3

2 moles of nitrogen give 4 moles of ammonia which weigh 72g in total (4x18 = 72)
Just wanted to add:
1. Shouldn't the mole coefficient of H2 be 6?
2. Why (4*18)g? Ammonia's Mr is 17. Then, 4*17=68g
Title: Re: Can someone help me figure this out?
Post by: DrCMS on August 15, 2007, 05:13:07 PM
Quote from: wilson on August 15, 2007, 12:59:25 PM
Quote from: DrCMS on August 15, 2007, 10:02:00 AM
No they wanted the weight of ammoina produced from 2 moles of nitrogen not the weight of 4 moles of nitrogen.

2N2 + 3H2 -> 4NH3

2 moles of nitrogen give 4 moles of ammonia which weigh 72g in total (4x18 = 72)
Just wanted to add:
1. Shouldn't the mole coefficient of H2 be 6?
2. Why (4*18)g? Ammonia's Mr is 17. Then, 4*17=68g

Yes its 68 not 72 and for 2N2 yes 6H2 gives 4NH3.