Date | November 2014 | Marks available | 1 | Reference code | 14N.1.hl.TZ0.18 |
Level | HL | Paper | 1 | Time zone | TZ0 |
Command term | Question number | 18 | Adapted from | N/A |
Question
Consider the values of \(\Delta {H^\Theta }\) and \(\Delta {S^\Theta }\) À for the reaction of nitrogen with oxygen at 298 K.
\({{\text{N}}_{\text{2}}}{\text{(g)}} + {{\text{O}}_{\text{2}}}{\text{(g)}} \to {\text{2NO(g)}}\) \(\Delta {H^\Theta } = + 181{\text{ kJ}}\,{\text{mo}}{{\text{l}}^{ - 1}}\)
\(\Delta {S^\Theta } = + 25{\text{ J}}\,{{\text{K}}^{ - 1}}{\text{mo}}{{\text{l}}^{ - 1}}\)
Which statement is correct for this reaction?
A. \(\Delta {G^\Theta }\) is positive at all temperatures.
B. \(\Delta {G^\Theta }\) is negative at all temperatures.
C. \(\Delta {G^\Theta }\) is positive at high temperatures.
D. \(\Delta {G^\Theta }\) is positive at low temperatures.
Markscheme
D