Chemistry

Question

The (triangle)Hrxn of formation of carbon dioxide is negative. Which statement is true? The reaction is endothermic. The reaction is exothermic. The amount of carbon dioxide is more than the amount of reactants. The amount of carbon dioxide is less than the amount of reactants.

2 Answer

  • The negative ion reactions that consist of the formation of carbon dioxide in the atmosphere is generally an exothermic reaction. By definition, an exothermic reaction takes place when the chemical process eventually releases heat as its by-product. It is in contrast in endothermic process wherein heat is absorbed.
  • Answer:The reaction is exothermic.

    Explanation:

    Enthalpy of Formation ([tex]\Delta H_{rxn}[/tex]): It is defined as change in enthalpy when one mole of substance is formed at standard temperature and pressure from its pure elements under same conditions.

    1) [tex]\Delta H_{rxn}= negative[/tex]

    When the energy is released during formation of compound in a chemical reaction that is an Exothermic reaction.

    2) [tex]\Delta H_{rxn}= positive[/tex]

    When the energy is absorbed during the formation of compound in a chemical reaction that is an Endothermic reaction

    The [tex]\Delta H_{rxn}[/tex]of formation of carbon dioxide is negative means that the reaction is exothermic reaction.

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