Calculate a value for Erxn for a chemical reaction if the ...

[serike]

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

[adammoses97]

Answer to Question 1

+500 kJ/mol. Reaction is endothermic.

Answer to Question 2

C

Answer to Question 3

C

[serike]

TY

[adammoses97]

You're welcome