Conversion problems

Question

Unleaded gasoline has a density of 0.680 g/ml. How many kilograms are in 14.0 gallons of unleaded gasoline?

Answer 1

Here we need to perform 2 conversions.

g → kg and mL → gal

1 kg = 1000 g

1 gal = 3785 mL

0.680 g/mL x (1 kg / 1000 g) x (3785 mL / 1 gal) = 2.57 kg / gal

# of kg in 14.0 gal = 2.57 kg / gal x 14.0 gal = 36.0 kg