chemistry

posted by .

Hi,

I can't figure out how to start this one. I know I need to figure out the proportions or something of that sort. Any help is greatly appreciated Thanks!

Calculate ĢH for the reaction
NO(g) + O(g) ¨ NO2(g)

given the following:

NO(g) + O3(g) ¨ NO2(g) + O2(g)
ĢH = -198.9 kJ

O3(g) ¨ 3/2 O2(g)
ĢH = -142.3 kJ

O2(g) ¨ 2O(g)
ĢH = 495.0 kJ

  • chemistry -

    I assume those strange symbols stand for delta H.
    Write equation 1 as is.
    Reverse equation 2 and add to 1.
    Take 1/2 of equation 3 and reverse it; add to the other two.
    When you reverse an equation you change the sign of delta H. If you take 1/2 of an equation you take 1/2 delta H.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Alg 2/trig

    I am doing Geometric sequences, but I cannot figure out how to find the Nth term of a geometric sequence. The problem is A1 = 64, Ak+1 = 1/2Ak (That is supposed to be A sub one, A sub k + 1, etc.) The formula for finding the equation …
  2. Chemistry

    Fe2O3(s) + 2 Al(s) 2 Fe(l) + Al2O3(s) Suppose we want to make 18.0 grams of iron. We must figure out how much starting material we need. This is a three-step calculation. Let's go through these steps one-by-one to calculate the mass …
  3. Physical chemistry

    help! I am trying to figure out how to convert from equation one to equation two. I have spent two hours on this and cannot figure it out. I would greatly appreciate if someone could help me out on this. Equation1: v= sqr root (3RT/M) …
  4. Math

    Which is generally a better credit term? (a) 2 / 20 (b) 1 / 20 (c) 2 / 10 (d) 3 / 10 (e) 1 / 10 I am thinking its either b or e cause its 1 outta something and the others are 2 or 3 outta something so im not for sure how to figure
  5. Math

    AAA Company currently sells radios for $ 80 less 25 % . Their competitors are now selling the same product for $ 48 . AAA must offer an additional discount of _____ in order to meet their competitor's price. A single discount of _____ …
  6. Chemistry

    I can't figure out a clear way to write out the formatting of the question, but here is a picture. Any help is greatly appreciated. the image is on the website imggur and then then after imgur dot com its /Cus8o
  7. Chemistry

    Calculate the amount of Na2HPO4*7H2O in grams needed to make 50 mL of a 0.40 M solution. I think this is dealing with molarity but i cant figure it all out for some reason?
  8. Chemistry

    Hi Dr. Bob, I am quite stumped on how to figure out when chemical equations have a REACTION or NO REACTION. I have read the material in my textbook and even took out a chemistry books for the "Utterly Confused" to try to figure this …
  9. chemistry

    Hey, I was just struggling with a question that I need to figure out to help me with my next lab, so if any of you guys could help me that would be greatly appreciated. Question: write a balanced equation for the reaction between H2O2 …
  10. math

    Please I need help: I need to figure out the procedure to this question: Growth rate of odd size object: Start: 1.5" w by 1.5" l by .25" h End: 3.25" w by 3.50" l by .25" h Did this object increase by 600%?

More Similar Questions