15. Balance the following equations: (a) Ag(s) + H, S(g) + O2(g) — Ag, S(s) + H2O(1)
(b) Pa(s) + O2(g) – P4010(s)
(c) Pb(s) + H2O(l) + O2(g) Pb(OH),(s)
(d) Fe(s) + H2O(1) Fe, 04(s) + H2(g)

b. is the answer hoped i        

the answer is d. 74.02

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.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;