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Question

Calculate the change of entropy ΔrSm at 298 K for the reaction in which urea is formed from NH3 and CO2. The standard entropy of NH2CONH2 is 174.0 JK1mol1. For NH3, CO2 and H2O it is 192.3, 213 and 69.9JK1

A
354.4JK1
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B
354.4JK1
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C
453.4JK1
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D
453.4JK1
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Solution

The correct option is A 354.4JK1
ΔrSm=VpS(products)VpS(reactants)=[(174.0+69.9)(2×192.3+213)]JK1mol1=(243.9598.8)JK1mol1=354.4JK1

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