The oxidation of ferrous iron (Fe2+) to ferric iron (Fe3+) by molecular oxygen can be described by the following reaction:4R"(aq) + 02(3) + «ii-Natl) - 4Fc"(aq) + 2H20(l)(a) Using free energies of formation, calculate the equilibrium constant for this reaction at 25°C.(b) For a water in equilibrium with the atmosphere, a pH of 20, and a total soluble iron concentration of 1 mg/ L, calculatethe concentrations of Fe2+(aq) and Fe3+{aq).

What material does not melt at any temperature

1. if you have a gas at 127 degrees c, what is it's absolute temperature (kelvin)? a. 200kb. 300kc. 400kd. 500k2. if you had a gas whose absolute temperature measured 45 k, what is that temperature in celsius? a. -228 cb. -300 cc. 125 cd. 112 c

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal. b. he is determining chemical properties that are sufficient to identify the metal. c. he is determining physical properties that are insufficient to identify the metal. d. he is determining chemical properties that are insufficient to identify the metal.