Its Graphitic!

Read the following sequence of reactions and then answer the question :

• Graphite reacts with hot and concentrated $HNO_{3}$ to form an acid $A$ with $\boxed{C_{2}O_{2}H}$ as its empirical formula.

• When $A$ is heated we get $B$ , which is an oxide of carbon, with $\boxed{C_{4}O_{3}}$ as its empirical formula.

• When $A$ undergoes dry distillation we get another acid $C$ with empirical formula : $\boxed{C_{5}H_{3}O_{4}}$ and a gaseous compound of carbon $D$ .

If $a$ , $b$ , $c$ and $d$ are the relative molecular masses of the compounds $A$ , $B$ , $C$ and $D$ respectively, then find the value of $a$ + $b$ + $c$ + $d$ as $\boxed{M}$