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Hess's law of heat summitaion is in agre...

Hess's law of heat summitaion is in agreement with

A

zeroth law of thermodynamics

B

first law of thermodynamics

C

second law of thermodynamics

D

third law of thermodynamic

Text Solution

Verified by Experts

The correct Answer is:
B
Hess's law is consistent with the law of conservation of energy also called the first law of thermodynamics.
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Hess law

Hess's law states,

Hess's law of heat of summatiion is based on law of conservation of energy. It has found significance in deriving heats of many reactions which either do not take place or if take place, than other side reactions also accompany it. For example heat of reaction for C+(1)/(2)O_(2) rarr CO can not be studied directly as it occurs with simultaneous reaction of oxidation of CO to CO_(2) . Bond energy is referred as heat enthalpy when a bond is broken to produce isolated gaseous atoms. In case of breaking up of bonds between unlike atoms e.g., C-H bond in CH_(4) , bond energy is referred as avarage bond energy as four C-H bonds are broken up. Which of the following statements are correct ? (1) The dissociation of a ond is always endothermic (2) The formation of a bond is always exothermic. (3) Heat of formation of an atom =1//2xx bond energy like atoms covalent bond. (4) The heat enthalpy change in a chemical reaction is equal but opposite to the heat enthalpy if reaction is reversed. (5) Hess's law can be verified experimentally.

Hess's law of heat of summatiion is based on law of conservation of energy. It has found significance in deriving heats of many reactions which either do not take place or if take place, than other side reactions also accompany it. For example heat of reaction for C+(1)/(2)O_(2) rarr CO can not be studied directly as it occurs with simultaneous reaction of oxidation of CO to CO_(2) . Bond energy is referred as heat enthalpy when a bond is broken to produce isolated gaseous atoms. In case of breaking up of bonds between unlike atoms e.g., C-H bond in CH_(4) , bond energy is referred as avarage bond energy as four C-H bonds are broken up. The heat of fusion for water is +1.44kcal . The heat requried to change 27g ice at 0^(@)C to water is :

Hess's law of constant heat summation is bases on

Hess's law of constant heat summationk is applied to calculate

Hess's law of constant heat summation is consistent with the fact that enthalpy is

Hess's law states that