A) - 2259 kJ
B) 209 kJ
C) +2259 kJ
D) - 209 KJ
Correct Answer: B
Solution :
\[{{C}_{2}}{{H}_{5}}+\frac{5}{2}{{O}_{2}}(g)\xrightarrow{{}}2C{{O}_{2}}+{{H}_{2}}O\] \[\Delta G{}^\circ =\,\,-1234\,kJ\] ... (i) \[\operatorname{C}\,+\,\,{{O}_{2}}\,\xrightarrow{{}}\,\,C{{O}_{2}}\,\,\,\Delta G{}^\circ =\,\,-394\,kJ\] ... (ii) \[\operatorname{H}+\frac{1}{2}{{O}_{2}}\,\,\xrightarrow{{}}\,{{H}_{2}}O\,\,\,\Delta G{}^\circ =-\,237kJ\] ? (iii) Eq.,\[\left( ii \right)\times 2+Eq.\left( iii \right)-Eq.\left( i \right)\] \[\Delta G{}^\circ =2\left( -\,394 \right)+\left( -\,237 \right)-\left( \,-1234 \right)\] \[\Delta G{}^\circ =209kJ\]You need to login to perform this action.
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