Answer:
Exothermic reaction: The
chemical reaction which takes place with evolution of heat energy is called
exothermic reaction. In this reaction, enthalpy change is negative.
\[C(s)+{{O}_{2}}(g)\to
C{{O}_{2}}(g)+393.5kJ\]
\[2{{C}_{4}}{{H}_{10}}(g)+13{{O}_{2}}(g)\to
8C{{O}_{2}}(g)+10{{H}_{2}}O(g)+5316kJ\]
Endothermic reaction: The
chemical reaction which occurs with the absorption of energy is called
endothermic reaction. In this reaction, enthalpy change is positive.
\[{{N}_{2}}(g)+{{O}_{2}}(g)+180.5kJ\to
2NO(g)\]
\[C(s)+2S(s)+92.0kJ\to
C{{S}_{2}}(s)\]
\[S<P<O<P\]
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