Chemistry . need like a. s.a. p. don't really understand this. really need some . picture is attached.

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

Use the de broglie's wave equation to find the wavelength of an electron moving at 7.3 × 106 m/s. show your work. note: h = plank's constant (6.62607 x 10-34 j s)

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2