The metal content of iron in ores can be determined by a redox procedure in which the sample is first oxidized with br2 to convert all the iron to fe3+ and then titrated with sn2+ to reduce the fe3+ to fe2+.

the balanced equation is: 2fe3+(aq) + sn2+(aq) -> 2fe2+(aq) + sn4+(aq)

what is the mass percentage fe in a 0.1875g sample if 13.28 ml of 0.1015 m sn2+ solution is needed to titrate the fe3+?

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .