Magnesium reacts with ammonia, NH3, at high temperatures to produce solid magnesium nitride, Mg3N2, and hydrogen. How many grams of magnesium reacts with 16,400 mL (STP) of ammonia? 3Mg(s) + 2NH3(g) Mg3N2(s) + 3H2(g)

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11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

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 electron configuration represents the electrons in an atom of sodium in the ground state at stp