Question

All of the following have $\Delta G_f^o=0$, except:

• A. $O_2\left(g\right)$
• B. $B{r}_2\left(g\right)$
• C. $H_2\left(g\right)$
• D. $Ca\left(s\right)$
• E. $Hg\left(l\right)$

Answer 1

The correct option is B $B{r}_2\left(g\right)$

The correct answer is (B).

$B{r}_2$, this is because $B{r}_2$ at room temperature is liquid so, $\Delta G_f^o\left(B{r}_2\right(g\left)\right)=0$.