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Thermodynamics

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Chemistry Part I

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Chemistry

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Thermodynamics

What is the realtionship between C_pand C_v?

C_p – C_v = R for one mole of an ideal gas. Thus C_p is greater than C_v by the gas constant R.

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Why is ∆H negative in an exothermic reaction?

Exothermic reactions are accompanied by the evolution of heat. It means that enthalpy of the reactants is more than the enthalpy of the products i.e.
H_r > H_p

But

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Define heat capacity ?

Heat capacity (C) = q/∆T.

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What is the standard state of the substance?

The most stable state of substance is at 1 bar pressure and at a specified temperature (298K).

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What are exothermic and endothermic reactions?

Exothermic reactions are those reactions which are accompanied by the evolution of heat.
Endothermic reactions are those reactions which are accompanied by the absorption of heat.

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