I have the compound C30H62, the candle

Question

The question is:
When a candle is burned, 150.0 liters of O2 (g) is used up. How many grams of oxygen react?

Answer 1

22.4 liters/mol at stp

so how many mols?
150/22.4 approximately (it does not say if we are at stp)

grams of O2 = mols * 32