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Question

For a reaction: XY+Z
The absolute entropies for X,Y and Z are 120 J K1mol1, 213.8 J K1 mol1 and 197.9 J K1mol1 respectively.
What will be the entropy change of the reaction at 298 K and 1 atm? 


A
291.7 J K1
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B
255 J K1
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C
213.8 J K1
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D
257.3 J K1
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Solution

The correct option is A 291.7 J K1
Change in entropy for a reaction is given as: 
ΔS= Entropy of the product - Entropy of the reactant
So, ΔS = SproductSreactant
ΔS = (SY+SZ)SX
= (213.8+197.9)120
ΔS = 291.7 JK1mol1
 

Theory:
ΔS=SfinalSinitial

ΔS=SproductsSreactants


Chemistry

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