C$_6$H$_6$ (liq) + $\frac{15}{2}$ O$_2$ (g) $\rightarrow$ 6CO$_2$ (g) + 3H$_2$O (liq). Benzene burns in oxygen according to the above equation. What is the volume of oxygen (at STP) needed for complete combustion of 39 gram of liquid benzene?