Density is mass/volume so just substitute numbers in to get 8.75 pounds/0.358 liters = 24.44 pounds/liter = density.
If you want the density in the more acceptable terms of g/L, then simply convert 24.44 pounds to grams.
24.44 lbs x 454 g/lb = 11096 g
So density would be an extraordinary 11,096 g/L (not a realistic value). You may want to check your values.