What is the mass of 8.83 x 10^23 formula units of Iron (III) oxide, Fe2O3?

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

answeridentity;