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Heat of reaction at constant pressure is...

Heat of reaction at constant pressure is………….. .

A

`Delta U`

B

`Delta H`

C

`Delta P`

D

`Delta V`

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The correct Answer is:
B
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Heat of a reaction (Q) at constant pressure is equal to

Chemical reactions are invariably associated with the transfter of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as {:(q = ms DeltaT,,s =Specific heat),(=cDeltaT,,c =Heat capacity):} Heat of reaction at constant volume is measured using bomb calorimeter. q_(V) = DeltaU = Internal energy change Heat of reaction at constant pressure is measured using simple or water calorimeter. q_(p) = DeltaH q_(p) = q_(V) +P DeltaV DeltaH = DeltaU +DeltanRT For which reaction will DeltaH = DeltaU ? Assume each reaction is carried out in an open container.

Chemical reactions are invariably associated with the transfter of energy either in the form of heat or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as {:(q = ms DeltaT,,s ="Specific heat"),(=cDeltaT,,c ="Heat capacity"):} Heat of reaction at constant volume is measured using bomb calorimeter. q_(V) = DeltaU = Internal energy change Heat of reaction at constant pressure is measured using simple or water calorimeter. q_(p) = DeltaH q_(p) = q_(V) +P DeltaV DeltaH = DeltaU +DeltanRT The heat capacity of a bomb calorimeter is 500 JK^(-1) . When 0.1g of methane was burnt in this calorimeter, the temperature rose by 2^(@)C . The value of DeltaU per mole will be

MARVEL PUBLICATION-CHEMICAL THERMODYNAMICS AND ENERGETICS-MULTIPLE CHOICE QUESTIONS (TEST YOUR GRASP)
  1. Heat of reaction at constant pressure is………….. .

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  2. Delta H and Delta U are related as

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  3. For the combustion of 1 mole of n-octane C(8)H(10(I)) producing carbon...

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  4. Regarding the internal energy of the molecule, which of following stat...

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  5. For an adiabatic process

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  6. The enthalpies of combustion of carbon and carbon monoxide are -390 kJ...

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  7. The energy of an isolated system

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  8. Hess's law deals with

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  9. If the door of a refrigerator is kept open, then which of the followin...

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  10. For the following reaction at 298 K H(2(g)) +(1)/(2)O(2(g))=H(2)O((l...

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  11. The enthalpy change for the reaction C(2)H(2(g))+(5)/(2)O(2(g)) rarr...

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  12. An isolated system is that system in which

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  13. The Delta H for combustion of a substance

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  14. Work done in an isothermal process at constant pressure is

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  15. Molar heat capacity is

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  16. In endothermic reaction

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  17. Identify the state function among the following :

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  18. For the reaction C(2)H(4)(g)+3O(2)(g) rarr 2CO(2) (g) +2H(2)O(l), De...

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  19. For the reaction N(2)(g)+3H(2)(g)to2NH(3)(g), which of the following...

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  20. A system, which can exchange mass as well as energy with its surroundi...

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