If 0.81 moles of AlF3 are used, how many moles of O2 are needed for this reaction to run to completion?

Lewis structure and molecular geometry for nh2cl

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils. the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

Which characteristics can be used to differentiate star systems? check all that apply.