The answer needs to be in meters.

This is what i did: I converted 1.9 L to .0019 m^3, and divided that by 330 million to get 5.757575*10^-11 m^3. Then I set this to 4 pi r^3 over 3 and found the radius, which i multiplied by 2 to get a diameter of 1.03*10^-11 which was wrong. Ive also done this calculation to get an answer of .00048 which was also wrong. Can anyone help?