1 kilogram mass weighs 2.20462 pounds on earth. 399 kilograms weighs (399 x 2.20462) = 879.643 pounds (on earth, rounded)
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There are 24.9375 pounds in 399 ounces.
This volume is 6,197 399 5 at 25 0C.
13.5 US fl oz = approx 399 ml.
The molar mass of cesium (Cs) is approximately 133 g/mol. Therefore, the mass of 3.00 mol of cesium would be 3.00 mol x 133 g/mol = 399 g.
There is 8 planets in our solar system now, becuase scientists no longer classify Pluto as a planet. There where about 400 planets found so making it about 399 so about 391 exo-planets have been found. Hope that answers your question!