Sulfur can be separated from lead in the mineral galena, PbS(s), by "roasting" the ore in the presence of oxygen as shown in the following reaction:
2PbS(s) + 302(g) → 2P50(s) + 2502 (9) Calculate ASº for this reaction using the
thermodynamic data provided below.
PbS(s) = 91.2 J/K mol
O2 =
= 205.0 J/K mol
PbO = 69.45 J/K mol
SO2 = 248.5 J/K mol
0 - 161.5 J/K mol
O-47.7 J/K mol
O 21.8 J/K mol
O 43.5 J/K mol
0-410 J/K mol

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explanation:

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.