2010 USNCO Local #22: Entropy Change
Source:
November 23, 2012
Problem Statement
Which reaction has the most positive entropy change under standard conditions? (A)\hspace{.05in}\ce{H2O}_{(g)}+\ce{CO}_{(g)} \rightarrow \ce{H2}_{(g)}+ \ce{CO2}_{(g)}\qquad
(B)\hspace{.05in}\ce{CaCO3}_{(s)} \rightarrow \ce{CaO}_{(s)} + \ce{CO2}_{(g)} \qquad
(C)\hspace{.05in}\ce{NH3}_{(g)} \rightarrow \ce{NH3}_{(aq)}\qquad
(D)\hspace{.05in}\ce{C8H18}_{(l)} \rightarrow \ce{C8H18}_{(s)}\qquad