Respuesta :
Answer : The correct options are, (b), (c) and (d)
Explanation :
Endothermic reaction : It is defined as the chemical reaction in which the energy is absorbed from the surrounding.
In the endothermic reaction, the energy of reactant are less than the energy of product.
Exothermic reaction : It is defined as the chemical reaction in which the energy is released into the surrounding.
In the exothermic reaction, the energy of reactant are more than the energy of product.
Enthalpy change : It is the difference between the energy of product and the reactant. It is represented as [tex]\Delta H[/tex].
In an endothermic reaction, the energy of products are higher than the reactants energy. Thus, the change in enthalpy is positive.
In an exothermic reaction, the energy of products are lesser than the reactants energy. Thus, the change in enthalpy is negative.
Reaction (a):
[tex]H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2O(aq)[/tex], [tex]\Delta H=-57.83kcal/mol[/tex]
This reaction is an exothermic reaction because value of change in enthalpy is negative.
Reaction (b):
[tex]\frac{1}{2}N_2(g)+\frac{1}{2}O_2(g)\rightarrow NO(g)[/tex], [tex]\Delta H=+21.6kcal/mol[/tex]
This reaction is an endothermic reaction because value of change in enthalpy is positive.
Reaction (c):
[tex]\frac{1}{2}N_2(g)+O_2(g)\rightarrow NO_2(g)[/tex], [tex]\Delta H=+8.1kcal/mol[/tex]
This reaction is an endothermic reaction because value of change in enthalpy is positive.
Reaction (d):
[tex]\frac{1}{2}N_2(g)+\frac{3}{2}H_2(g)\rightarrow NH_3(g)[/tex], [tex]\Delta H=+11.0kcal/mol[/tex]
This reaction is an endothermic reaction because value of change in enthalpy is positive.
Hence, the endothermic reactions are, (b), (c) and (d)
Reactions B, C, and D are endothermic reactions among was given reactions.
What are Endothermic reactions?
The chemical reaction in which the energy is absorbed during the reaction from surroundings.
The change in enthalpy is positive for the endothermic reactions because energy is added to the system.
Therefore, reactions B, C, and D are endothermic reactions among was given reactions.
Learn more about Endothermic reactions.
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