question_answer

The free energy change for the following reactions are given below, \[{{C}_{2}}{{H}_{2}}(g)+\frac{5}{2}{{O}_{2}}(g)\,\to \]\[2C{{O}_{2}}(g)+{{H}_{2}}O(l);\,\Delta {{G}^{o}}=-1234\,kJ\] \[C(s)+{{O}_{2}}(g)\,\to C{{O}_{2}}(g)\,\,\Delta {{G}^{o}}=-394\,kJ\] \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\,\to \,{{H}_{2}}O(l)\,\,\,\Delta {{G}^{o}}=-237kJ\] What is the standard free energy change for the reaction \[{{H}_{2}}(g)+2\,C\,(s)\to {{C}_{2}}{{H}_{2}}(g)\]                                        [Kerala (Med.) 2002]

A)                 ? 209 kJ

B)                 ? 2259 kJ

C)                 + 2259 kJ             

D)                 209 kJ