There is 47 hydrogen atoms, 634 oxygen atoms, and 18 iron atoms. whats the chemical reaction?

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.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.