Homework Help Forum: chemistry

Posted by Katie Y. on Monday, November 2, 2009 at 11:07am.

N2 + O2 --> 2 NO change in heat (delta H)= 43.2 kcal based on the reaction, which statement is true? a) 43.2 kcal are consumed when 1.00g of O2 reacts b) 43.2 kcal are consumed when 1.00g of N2 reacts c) 43.2 kcal are consumed when 1.00g of NO is produced d) 43.2 kcal are consumed when 1.00 mole of O2 reacts I think it is D because the heat is used when the reaction occurs and the product is made. Is this correct?

• chemistry - DrBob222, Monday, November 2, 2009 at 11:44am

  I have a problem with your reasoning. All of the answers "are consumed" so any could be true based on that alone. As for the product being made why wouldn't c be just as true? NO is a product and it is made? And for that matter, why choose d based on formation of NO? Why not a or b for reactant used? You are correct that D is the right answer but you don't get credit for that because you are guessing.

  
  

• chemistry - nancy, Monday, November 2, 2009 at 12:24pm

  i need help to make a data for my project but i don't know how close can a magnet be from the staples after it will pick up the objects but i don't know how to put in a data

  
  

• to Nancy - DrBob222, Monday, November 2, 2009 at 12:41pm

  1. If you have a new post, you are unlikely to get an answer posting piggy back onto another question. Go to the top of the page, click on Post a New Question, and make your post. 2. When you use these boards, don't use text style typing. Begin sentences with a capital letter and end them with periods. Write I when you mean I and not i. 3. For this particular question, you need to clarify exactly what you want. I can tell it has something to do with magnets and staples but that's all I can decipher.

  
  

Answer this Question

First Name:
School Subject:
Answer:

For Further Reading