Answer
See explanation.
Work Step by Step
We determine the molar mass:
$M=m_{molecule}\times N_A=7.31\times 10^{-23}\times 6.022\times 10^{23}\approx 44$ g/mol.
We are looking for real compounds with a molar mass around 44 g/mol.
Examples:
$CO_2$: 12.0+2(16.0)=44.0
$C_3H_8$: $3(12.0)+8(1.0)=44.0$
