1) 2NO(g) + O2(g)2NO2(g) Using standard absolute entropies at 298K, calculate the entropy change for the system when 1.83 moles of NO(g) react at standard conditions.
S°system = J/K
2) 2NO(g) + 2H2(g)N2(g) + 2H2O(l)
Using standard absolute entropies at 298K, calculate the entropy change for the system when 1.95 moles of NO(g) react at standard conditions.
S°system = J/K

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.