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Calculate the entropy change (J//mol K) ...

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`

Text Solution

Verified by Experts

The correct Answer is:
B
`Delta_(r )S=(2xx248.2)+(2xx66.5)`
`-(2xx91.2)-3(205.1)`
=-168.3 J
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