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Old Feb 15th 2015, 05:39 AM   #1
angelap99
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Smile Limiting Reagent Help

Hello everyone,

Please look at snapshot of problem that I saved in this link:

https://www.dropbox.com/s/ufqr5ee7m6...22009.jpg?dl=0

^^ You'll probably have to view original to see it in larger size by clicking on icon on bottom right with the 3 dots (...).

I did this problem and got the first 3 questions wrong. Where am I going wrong?

A.Molecules of NH3 after completed reaction =? Not sure if 'after completed reaction' is meant to throw me off or not

(6.022E23 molecules NH3/1 mole NH3) * (2 moles NH3) = answer.

Is my work right?

B. (9 molecules of H2) * (6.022 E23 molecules H2/1 mole H2) *(3 moles H2)

= left with molecules of H2. This doesn't seem right because I don't have a ratio for 9 molecules of H2 to pair it with. But, the molecules remain really confuse me.

C. I set up exactly like part B, except using N2 molecules numbers and moles in chemistry equation.

I would appreciate some guidance!
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