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Author Question: Calculate a value for Erxn for a chemical reaction if the reactants have an energy of -400 kJ/mol ... (Read 147 times)

serike

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on: Aug 27, 2018
Calculate a value for Erxn for a chemical reaction if the reactants have an energy of -400 kJ/mol and the products have an energy of +100 kJ/mol. Is this reaction exothermic or endothermic?
 
  What will be an ideal response?

Question 2

Octane (C8H18 ) reacts with oxygen (O2 ) to form carbon dioxide (CO2 ) and water (H2O). When the equation below is balanced, the coefficient of octane is:
 
  C8H18 + O2  CO2 + H2O
  A) 8
  B) 25
  C) 2
  D) 16

Question 3

Which of the following has the highest molar mass?
 
  A) (NH4)3PO3
  B) Ca3(PO4)2
  C) Al2(SO3)3
  D) Co2(CO3)2


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adammoses97

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Reply #1 on: Aug 27, 2018
Answer to Question 1

+500 kJ/mol. Reaction is endothermic.

Answer to Question 2

C

Answer to Question 3

C


serike

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Reply #2 on: Aug 27, 2018
TY


adammoses97

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Reply #3 on: Aug 27, 2018
You're welcome


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