For the reaction of carbon dioxide to form carbon monoxide and oxygen, ah is equal
+570 kj. the reaction is
a. exothermic
b. combination
c. oxidation
d. endothermic
e. all of the above

d = endothermic

Explanation:

Chemical equation:

2CO₂  →  2CO + O₂

When carbon dioxide form carbon monoxide and oxygen the ΔH is +570KJ.

When enthalpy of reaction is positive and  ΔH is greater than zero it means heat is given to the reaction.

It is called endothermic reaction.

In this case enthalpy of product is higher than enthalpy of reactant

When enthalpy of reaction is negative and  ΔH is less than zero it means heat is released during the reaction.

It is called exothermic reaction.

In this case enthalpy of product is lower than enthalpy of reactant.

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