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Question

The free energy change for the following reactions are given below
C2H2(g)+52O2(g)2CO2(g)+H2O(l);G0=1234kJ
C(s)+O2(g)CO2(g);G0=394kJ
H2(g)+12O2(g)H2O(l);G0=237kJ
What is the standard free energy change for the reaction,
H2(g)+2C(s)C2H2(g)

A
-209 kJ
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B
-2259 kJ
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C
+2259 kJ
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D
209 kJ
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