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Mukti Sahil Cheema
Asked: 2022-10-29T01:23:16+05:30 In:

Calculate the entropy change `(J//mol K)` of the given reaction. The molar entropies `(J//K-mol)` are given in brackets after each substance:
`2PbS(s)[19.2]+3O_(2)(g)[205.1]`
` to 2PbO(s)[66.5]+2O_(2)(g)[248.2]`
A. `-113.5`
B. `-168.3`
C. `+72.5`
D. `-149.2`

Calculate the entropy change `(J//mol K)` of the given reaction. The molar entropies `(J//K-mol)` are given in brackets after each substance:
`2PbS(s)[19.2]+3O_(2)(g)[205.1]`
` to 2PbO(s)[66.5]+2O_(2)(g)[248.2]`
A. `-113.5`
B. `-168.3`
C. `+72.5`
D. `-149.2`
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1 Answer

  1. Correct Answer – B
    `Delta_(r )S=(2xx248.2)+(2xx66.5)`
    `-(2xx91.2)-3(205.1)`
    =-168.3 J

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