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xarqi, Generalist
Category: Homework
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# intro to college chem - stoichiometry (looking for a ratio)

### Customer Question

calculate the mass of NO that can be produced by the reaction of 29.7g of HNO3 according to the following balanced equasion... write me @[email protected] or call(NNN) NNN-NNNNreverse that charges) I dono't know if there is real help out there... sign me "looking for chemistry - Jean"
Submitted: 11 years ago.
Category: Homework
Expert:  xarqi replied 11 years ago.
I can help you with this if you supply the equation for the
reaction.
Customer: replied 11 years ago.
Reply to xarqi's Post: xarqi: the question: 8 HNO3(aq) + 3 Cu(s) --> 2 NO(g) + 3 Cu(NO3)2(aq) + 4H2)O(l) Comment: I keep thinking that I have to find a ratio... but I only have the given 29.7g of HNO3   Thanks Jean
Expert:  xarqi replied 11 years ago.

You need to spend \$3 to view this post. Add Funds to your account and buy credits.
Expert:  xarqi replied 11 years ago.
It looks like you viewed my answer at about the same time I
made a correction to an arithmetic mistake. For some reason I'd
thought 2/8 was a half! I've now fixed that.

If the numbers don't look exactly right, it is due to rounding in
intermediate values.

Is the method used clear?
Customer: replied 11 years ago.

I seeing another challenge... the MW (Mollecular Weight) of NO I SEE as 14 + 16 = 30 but not 14 + 1= 15 as you put it. (NH is 14+1)... i was unable to pinpoint the 2/8 = half error you I.D'd... but it is late here too...

did this extra reply cost me extra?

Jean
Customer: replied 11 years ago.
was it kosher to say that the ratio was 8:2 OR 4:1 ... yes / no
Expert:  xarqi replied 11 years ago.
Hi again.

Sorry - you are quite right - the MW is 30. D'oh!

0.12 moles will have mass 0.12 x 30 = 3.6 g

8:2 is the way it was given in the equation. That was because
there were 3 Cu involved and so the lowest whole numbers that
could be used were 8 and 2. A ratio of 4:1 is the same though.

No, so far this has not cost you anything at all. Your deposit is
refundable but is used toward any answer you accept. So far,
you have not accepted one. Not surprising given the mess I've
Customer: replied 11 years ago.
"...given the mess I've
LOL!

I still love you though!

Is this the only way I can find your chemical brain, and what hours do you work... FINAL on Thurs... still some study time left...

Jean

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