The free energy change for the following reactions are given below
`C_(2)H_(2)(g)+(5)/(2)O_(2)(g)to2CO_(2)(g)+H_(2)O(l),DeltaG^(@)=-1234kJ`
`C(s)+O_(2)(g)toCO_(2)(g),DeltaG^(@)=-394kJ`
`H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l),DeltaG^(@)=-273kJ`
What is the standard free energy change for the reaction `H_(2)(g)+2C(s)toC_(2)H_(2)(g)` :-

Options

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

Answer

4