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What doyou understand byexothermicreaction andendothermicreaction? Giveone exampleofeach type. |
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Answer» Solution :Exothermicreactions . Reactions WHICHARE accompaniedby evolution ofheatare calledexothermic reactions. The quantityof heatproducedis showneitheralongwith theproducts WITHA plussignor intermsof `DeltaH`with anegativesign. forexample. `C ( s)+ O_(2)( g) toCO_(2)( g) +393. 5 kJ` ` H_(2) (g) + (1)/(2) O_(2) (g)toH_(2) O(l) , Delta H=-285.8 kJ MOL^(-1)` Endothermicreactions. Reactions whichproceed withabsorption ofheatare calledendothermicreactions . the quantityof heatabsorbed is shown eitheralong withthe PRODUCTS witha negativesign orintermsof `DeltaH`with apositivesign. Forexample ` C ( s)+ H_(2) O( g) toCO (g)+ H_(2)( g) -131 .4 kJ` `N_(2)( g) +3 H_(2)( g) to2 NH_(3)( g) Delta H=- 92 kJ mol^(-1)` |
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