Please help me with this

Calculate the number of molecules present in 0.750 mol of mgo.

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.

Is 9 correct? and can someone me with 10? it’s due tomorrow, you