[CHM 112] Help on Chapter 15 Burdge Problems

[Andrew J. Pounds]

On 07/12/13 15:13,  wrote:
> Good Afternoon Dr. Pounds,
> I have a question about #60 in the Chapter 15 problems. If we were 
> given an endothermic process I understand the opposite will happen for 
> part A,B, and C but what will happen for part D and E?

If this were an endothermic reaction, both of these changes would still 
have "no effect".

> I also have a question about #102 in the Chapter 15 problems. How did 
> you do the algebra to calculate the moles of nitrogen dioxide and 
> dinitrogen tetraoxide?
> Thank you,
> Yordanos Abitew

Because I knew the total mass and the total moles, but not the 
individual number of moles, I set up two equations in two unknowns 
(simultaneous equations from Algebra)

Basically think of it as...

      X +      Y =  0.04565
46 X + 92 Y =  2.3


Multiply the first equation by -46 and then add the two equations 
together to get Y

46 Y = 0.2001
Y = 0.00435

Substitute Y back into either equation to get X

X = 0.0413

-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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