Answer
$C_{18}H_{12}N_{6}$
Work Step by Step
Calculate the molar mass of the empirical formula by adding the molar masses of its constituent elements together.
$3(12.01)+2(1.01)+1(14.0)= 52.05$
Divide the molar mass given by this number and round to the nearest whole number (it should be really close).
$\frac{312.29}{52.05}=6$
Multiply the Empirical formula by this number to get the molecular formula.
$6(C_{3}H_{2}N)=C_{18}H_{12}N_{6}$
