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Thermodynamics

Short Answer Type

51.

Define heat capacity ?

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52.

What is the realtionship between C_pand C_v?

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53.

What are exothermic and endothermic reactions?

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54.

What is the standard state of the substance?

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55. Why is ∆H negative in an exothermic reaction?

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56. Why ∆H is positive in an endothermic reaction?

Endothermic reactions are accompanied by the absorption of heat which means that enthalpy of the reaction is less than the enthalpy of the products i.e.

But

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57.

State with reason whether the work is done by the system on the surroundings or on the system by the surroundings if the following change occurs at constant pressure:
$Sn left parenthesis straight s right parenthesis space plus space 2 Cl subscript 2 left parenthesis straight g right parenthesis space rightwards arrow space space SnCl subscript 4 left parenthesis straight s right parenthesis$