A sample of carbon monoxide at 57.1°C and under 0.67 atm of pressure takes up 85.3 L of space. What mass of carbon monoxide is present in the sample?

Ompound a (c6h6) undergoes catalytic hydrogenation over lindlar catalyst to give a compound b which in turn undergoes ozonolysis followed by workup with aqueous h2o2 to yield succinic acid and two equivalents of formic acid. in the absence of a catalyst poison hydrogenation of a gives hexane. propose a structure for compound a.