How many liters of solution are needed to make a 0.5 M solution with 2.0 mol of BaCl2

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?