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Balance Chemical Equations, Help
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[DoD]Quasar
post May 10 2011, 06:14 PM
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So I have this assignment to balance these ridiculous chemical equations and I don't know of any 'method' to balance them, so I just know guess and check. Obviously, this is quite slow. Soooo, I was wondering if anyone would like to help me out with doing some chemistry problems and writing it all down on a piece of paper and then uploading the picture (like I've seen people do with math problems on here before) for me.

Here are the equations (and they are VERY complicated ones, apparently the second one can get up into the 3 digits for coefficients):



CuSCN + KIO3 + HCl --> CuSO4 + KCl + HCN + ICl + H2O





[Cr(N2H4CO)6]4[Cr(CN)6]3 + KMnO4 + H2SO4 --> K2CrO7 + MnSO4 + CO2 + KNO3 + K2SO4 + H2O






I need to show all the work for the problems so pictures are kind of necessary, so ya, sort of quite a bit of work, but I would be VERY VERY VERY appreciative to anyone who could help me with these! Please and Thank you :D

This post has been edited by DoO_Quasar: May 10 2011, 06:28 PM

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XpT_Velite
post May 10 2011, 06:17 PM
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if i still remembered this stuff i'd help you, but i don't :(. wouldn't want to give you wrong answers xD.


gl tho.

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xTiLkx
post May 10 2011, 06:19 PM
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Delete windows.

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XpT_Velite
post May 10 2011, 06:19 PM
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sometimes this site helps

http://www.wolframalpha.com/input/?i=CuSCN...%2B+ICl+%2B+H20

but doesn't rly give steps :S

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[DoD]Quasar
post May 10 2011, 06:30 PM
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Yeah, I need the steps :(

Maybe someone like Chrysalis or Ervd will help, I know Ervd is really good at math and he was plenty helpful last time and I generally think of Chrysalis as someone pretty smart and he's still in high school :)

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XpT_Velite
post May 10 2011, 06:31 PM
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i curse high school. it reinforced my short term memory x100, but made my long term memory almost non existentz. ACE TEST, FORGET MATERIAL FOREVER111

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[DoD]Quasar
post May 10 2011, 06:46 PM
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HAHA that is totally me 11, I do super imba on like all vocab quizzes in foreign languages classes then I have uber trouble remembering later on when I need to use a word, especially words that are not cognates or are specific to a certain milieu of life. Also, I have already forgotten like everything from my College Algebra class last term and don't remember any Chemistry from the first half of this term :wacko:

High School ftl :(

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Chrysalis
post May 10 2011, 07:00 PM
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wow your teacher is a bitch 11. sec figuring them out

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Chrysalis
post May 10 2011, 07:01 PM
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I actually had to do these algebraically cause they were so effing complicated 11.

First problem:

First assign variables for the coefficients. Obviously CuSCN and CuSO4 and HCN have to have the same coefficient, so call them all x. Same for KIO3 and KCl and ICl, call them y. From yKCl + yICl the total Cl is 2y, so HCl has coefficient 2y. coefficient of H2O is arbitrary, so call it z.

xCuSCN + yKIO3 + 2yHCl --> xCuSO4 + yKCl + xHCN + yICl + zH2O

From O coefficients: 3y = 4x + z
From H coefficients: 2y = x + 2z

6y = 8x + 2z
6y = 3x + 6z

4z = 5x
4y = 7x

x = 4, y = 7, z = 5

4CuSCN + 7KIO3 + 14HCl --> 4CuSO4 + 7KCl + 4HCN + 7ICl + 5H2O

4Cu + 4S + 4C + 4N + 7K + 7I + 21O + 14H + 14Cl --> 4Cu + 4S + 4C + 4N + 7K + 7I + 21O + 14H + 14Cl



Second problem (this one was an absolute bitch, took forever and complicated as poopie 11):

Figuring out the variables was the hard part of this one. (z-48x) is based on H, whereas (z-48x-y) is based on S.

x[Cr(N2H4CO)6]4[Cr(CN)6]3 + yKMnO4 + (z-48x)H2SO4 --> 7xK2CrO7 + yMnSO4 + 42xCO2 + 66xKNO3 + (z-48x-y)K2SO4 + zH2O

Cr N H C O K Mn S

From O coefficients: 24x + 4y + 4z - 192x = 49x + 4y + 84x + 198x + 4z - 192x - 4y + z
24x + 4y + 4z = 331x + 5z
4y = 307x + z
8y = 614x + 2z

From K coefficients: y = 14x + 66x + 2z - 96x - 2y
3y = -16x + 2z

12y = 921x + 3z
12y = -64x + 8z

5z = 985x
5y = 630x

x = 5, y = 630, z = 985

5[Cr(N2H4CO)6]4[Cr(CN)6]3 + 630KMnO4 + 745H2SO4 --> 35K2CrO7 + 630MnSO4 + 210CO2 + 330KNO3 + 115K2SO4 + 985H2O

35Cr + 330N + 1970H + 210C + 5620O + 630K + 630Mn + 745S --> 35Cr + 330N + 1970H + 210C + 5620O + 630K + 630Mn + 745S



haven't done this poopie in two years :lol:, completely useless imo, not even professional chemists need to balance equations by hand lol. that was all the work I did btw, since I did it in notepad :thumbsup:

:flowers:

This post has been edited by Chrysalis: May 10 2011, 09:05 PM

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[DoD]Quasar
post May 10 2011, 07:11 PM
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QUOTE(Chrysalis @ May 10 2011, 06:00 PM)
wow your teacher is a bitch 11. sec figuring them out
*


Yes, yes she is 11. However, @bolded:


(IMG:http://i775.photobucket.com/albums/yy35/TOAO_Major/WUB.jpg)(IMG:http://i775.photobucket.com/albums/yy35/TOAO_Major/WUB.jpg)(IMG:http://i775.photobucket.com/albums/yy35/TOAO_Major/WUB.jpg)(IMG:http://i775.photobucket.com/albums/yy35/TOAO_Major/WUB.jpg)(IMG:http://i775.photobucket.com/albums/yy35/TOAO_Major/WUB.jpg)(IMG:http://i775.photobucket.com/albums/yy35/TOAO_Major/WUB.jpg)

:wub: :wub: :wub:

This post has been edited by DoO_Quasar: May 10 2011, 07:14 PM

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Chrysalis
post May 10 2011, 09:01 PM
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anytime man :wub:

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[DoD]Quasar
post May 10 2011, 09:05 PM
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ZOMG YOU ARE THE BEST 1111 OP :wub: :wub: :wub:

EPIC ONLY ONE IN CLASS WITH PROBLEMS SOLVED EVEN IF I DIDN'T KNOW HOW TO DO THEM (although now I can definitely see how the algebra works, that's cool :))

8) 8) 8)

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Adacc
post May 10 2011, 09:11 PM
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lol chrysalis OP

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[DoD]Quasar
post May 10 2011, 09:13 PM
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+1 :w00t:

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Chrysalis
post May 10 2011, 09:14 PM
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