Anyone Here good at chem.... HW due tomorrow... -.-'

EternityOfPain · Post by **EternityOfPain** » Sun Nov 04, 2007 7:49 pm

Hello,

As I am working on my homework assignment (which sadly totals over 100 problems @_@ i am noticing a few questions in where I am having trouble in figuring out the solution. Please any help would be greatly appericated!)

45) Assume that coal can be represented by the formula C135 H96 O9 NS.
a. What is the percent of nitrogen by mass in coal?
b. If 3 tons of coal were burned completely what mass of NO would be
produced? Assume that all of the nitrogen in the coal is converted
to NO.
c. Would the mass of NO calculated in part b be the maximum
amount of NO produced in this combustion reaction? Why or why
not?

I think for A I would total all the g/mole of each of the atoms and combine it and divide by the total gram / mole of nitrogen. But I am not sure. As far as the other two are concerned I am completely lost.

58. If you look at nuclear equations in sources other than this textbook, you
may find that the subscripts have been omitted. For example you may see
an equation for a fission reaction written this way.
235U + 1n → [236U] → 87Br + 146La + 3 1n

a. How do you know what the subscripts should be? Why can they be
omitted?
b. Why are the superscripts not omitted?

Totally lost on both -.-'

Drakonia · Post by **Drakonia** » Sun Nov 04, 2007 8:57 pm

I tried both problems and sent a PM, however I'm not a Chem major so hopefully there are other Beta members out there that will be more helpful.

Best, ~K

graymouser · Post by **graymouser** » Sun Nov 04, 2007 11:40 pm

Sent a pm your way with what I think are the solutions.

It has been too long since I have taken chemistry to be 100% sure of the answers so I'll hold off on posting them here.

Cloud · Post by **Cloud** » Sun Nov 04, 2007 11:40 pm

Is that your opinion?

graymouser · Post by **graymouser** » Sun Nov 04, 2007 11:41 pm

Cloud wrote:Is that your opinion?

Yep.

blueheaven · Post by **blueheaven** » Mon Nov 05, 2007 12:00 am

You lost me at "hello." :hitting:

EternityOfPain · Post by **EternityOfPain** » Mon Nov 05, 2007 6:31 am

Drakonia & Graymouser thanks alot! I was scratching my head for a long time in trying to figuring out these problems.

blueheaven wrote:You lost me at "hello."

I know how it is to be in that club... lol. Luckly after this last science course I wont have to take anymore for my major.