Density of gas is .737g/ml. You pump 7.2 gallons of gas. How much mass did you add to the car in kilograms?

Question

Density of gas is .737g/ml. You pump 7.2 gallons of gas. How much mass did you add to the car in kilograms?

Answer 1

If we have 7.2 gallons, we need to convert that to liters or milliliters.

There are 3.78541 liters in a gallon

 

7.2 gal x 3.78541 lit/gal = 27,254 liters = Volume

27.254 liters = 27254 ml

 

density = mass/volume

.737 = mass / 27254

mass = 20086.9 g

Finally, convert to kg

20086.9/1000 = 20 kg