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Identify the exothermic and endothermic ...

Identify the exothermic and endothermic changes:
(i) `NO(g)+(1)/(2)O_(2)(g) to NO_(2)(g)+57.0kJ`
(ii) `H_(2)O(s)+6.02kJ to H_(2)O(l)`
(iii) `C(s)+H_(2)O(g)toCO(g)+H_(2)(g)-130kJ`.

Text Solution

Verified by Experts

(i) `NO(g)+(1)/(2)O_(2)(g)toNO_(2)(g)+57.0kJ`. Heat is released
in this reaction. So, it is an exothermic reaction.
(ii) `H_(2)O(s)+6.02kJtoH_(2)O(l)`. Heat is absorbed in this reaction. So, it is an endothermic reaction.
(ii) `H_(2)O(s)+6.02kJtoH_(2)O(l)`. heat is absorbed in this reaction. so, it is an endothermic process.
(iii) `C(s)+H_(2)O(g)toCO(g)+H_(2)(g)-130kJ`
i.e., `C(s)+H_(2)O(g)+130kJtoCO(g)+H_(2)(g)`
This reaction involves the absorption of heat. hence, it is an endothermic reaction.
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