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