When reaction 1) and 2) below are added together, the result is reaction 3).1) h2o(l) + hno2(aq) ⇌ h3o+(aq) + no2‒(aq) k1 = 4.50 × 10‒42) h3o+(aq) + oh‒(aq) ⇌ 2 h2o(l) k2 = 1.00 × 10143) hno2(aq) + oh‒(aq) ⇌ no2‒(aq) + h2o(l) k3=? find the equilibrium constant, k3?

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

How many valence electrons are in atom of radon?