Date | November 2009 | Marks available | 1 | Reference code | 09N.1.sl.TZ0.17 |
Level | SL | Paper | 1 | Time zone | TZ0 |
Command term | Deduce | Question number | 17 | Adapted from | N/A |
Question
Use the average bond enthalpies below to calculate the enthalpy change, in kJ, for the following reaction.
\[{{\text{H}}_2}{\text{(g)}} + {{\text{I}}_2}{\text{(g)}} \to {\text{2HI(g)}}\]
A. +290
B. +10
C. –10
D. –290
Markscheme
C
Examiners report
One G2 comment stated that the question should have asked for the enthalpy change in the reaction in units of \({\text{kJ}}\,{\text{mo}}{{\text{l}}^{ - 1}}\) instead of kJ. This aspect of units has been discussed in detail in several previous subject reports and teachers are referred to these reports for further reference.