Question

Bottle of fertilzer concentrate contains 7.40 grams phosphate per 100 mL and 16.0 fluid ounces should be diluted with water to make 32.0 gallons of fertilizer to be applied to growing plants.

What is the phosphate concentration in grams per liter in the diluted fertilizer? (1 gallon = 128 fluid ounces.)

Answer 1

fertilzer concentration = 7.40 g / 100 mL

                                    = 74 g/ L

volume = 16.0 fluid ounces.

1 gal ---------> 128 fluid ounces

??       ----------> 16 fluid ounces

volume = 16 x 1 / 128 = 0.125 gal

74 x 0.125 = C x 32

C = 0.289

phosphate concentration = 0.289 g / L