If the density of gasoline is 0.79g/mL, what mass of gasoline, in kilograms, is in a full 25 gallon tank?

Question

 Note: 1.00 gallons= 3.785L

Answer 1

We have to do a lot of playing with units here in converting.

 

First, how many liters are there in 25 gallons of gasoline given that

1.00 gal = 3.785L

 

(25gal)(3.785 L/gal) = 94.625L

 

We have 94.625L of gasoline.  However, our density is given in g/mL

Note:  1L = 1000 mL

(94.625L)(1000 mL/L) = 94,625mL of gasoline

 

We have 94,625mL of gasoline with a density of .79g/mL

(94,625mL)(.79g/mL) = 74,753.75g

 

We have a mass of 74,753.75g of gasoline, but we want this in kg

(74,753.75g)(1kg/1000g)

= 74.75375kg

 

Round this to however many decimals you need

Mass gasoline ≅ 74.754 kg