and the bromine concentration. Plugging in the appropriate concentration values, you get
5002 over the product of 0.05 times 0.03. You should be able to tell that this figures out to be in
the 10^5 region, much larger than the equilibrium constant. In order for this reaction to reach
equilibrium, it must use up all that excess hydrogen bromide. Consequently, the equilibrium
will shift to the left.42 . C
.5M solution of acetic acid (CH 3 COOH)
Take the negative log of both sides to determine pH.2.5 = pH43 . A
A Faraday is the magnitude of the charge of one mole of electrons. The Faraday, was named
after scientist Michael Faraday, who was responsible for the discovery of electromagnetic
induction, the laws of electrolysis, the discovery of benzene, and many other important
discoveries.
44 . C
This question gives you statements concerning the entropy of a system and asks you to
determine which one is incorrect. Choice C says that a spontaneous reaction will never have a
decrease in entropy. This is a false statement. Depending on the temperature and the enthalpy
change of a reaction, the entropy change can be negative. For instance, in phase changes from
gas to liquid or liquid to solid, a decreasing temperature spontaneously drives the system into
the more ordered state. That would be a decrease in entropy.
45 . E
2C 3 H 8 + 7O 2 → 6CO + 8H 2 O