Did I do this chm question correctly? Grams to molecules

How many molecules are in 3.1x10^-1 g of C9H40

Formula Weight =176

0.31/176 = 0.002 mol

0.002 x 6.022x10^23= 0.01204x10^23

=1.204x10^21

As point out, the molecular weight cited doesn't fit with your formula. However, the sequence of calculations is correct as to the proper way to go from grams to number of molecules.

(0.31 g) / (148.4149 g C9H40/mol) x (6.02 x 10^23 molecules/mol) =
1.3 × 10^21 molecules

Formula weight is:
You crazy