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Explain how heat absorbed at constant pressure is measured using coffee cup calorimeter with neat diagram. |
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Answer» <P> Solution :.(i) Measurement of heat change at CONSTANT pressure can be done in a coffee CUP calorimeter.(ii) We know that `DeltaH=q_(p)`,(at constant P) and therefore, heat ABSORBED or evolved, `q_(P)` at constant pressure is also called the heat of reaction Insulated or enthalpy of reaction, `DeltaH_(r)` (iii) In an exothermic reaction, heat is evolved, and system loses heat Nested to the surroundings. Therefore, `q_(p)` will be negative and `DeltaH_(r)` will Reaction also be negative. (iv) Similarly in an endothermic reaction, heat is absorbed, `q_(p)` Is positive and `DeltaH_(r)` will also be positive. 
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