To a certain amount of mixture of Fe, FeO and Fe2O3, add 120mL 4mol L of dilute nitric acid to completely dissolve the mixture, release 1.344L NO (standard condition), add KSCN solution to the resulting solution, and no red color appears. If the mixture of the same mass is reduced by heating with sufficient hydrogen, the amount of iron can be () A. 0.24 mol B. 0.21 mol C. 0.16 mol D. 0.14 mol

To a certain amount of mixture of Fe, FeO and Fe2O3, add 120mL 4mol L of dilute nitric acid to completely dissolve the mixture, release 1.344L NO (standard condition), add KSCN solution to the resulting solution, and no red color appears. If the mixture of the same mass is reduced by heating with sufficient hydrogen, the amount of iron can be () A. 0.24 mol B. 0.21 mol C. 0.16 mol D. 0.14 mol

Because a certain amount of Fe, FeO and Fe2O3 mixture is added with 120mL 4mol%/L dilute nitric acid, the mixture is completely dissolved, and KSCN solution is added to the resulting solution, without blood red, the amount of solute in the solution is Fe (NO3)2,1.344L NO (standard condition)1.344L22....

In Torricelli's experiment, why is atmospheric pressure equal to the pressure produced by the mercury column? In the Torricelli experiment, why is the atmospheric pressure equal to the pressure produced by the mercury column?

The resultant force of an object at rest is 0
I.e. the downward gravity of the mercury column is equal to the upward support force
The upward support comes from atmospheric pressure
When two forces are equal in magnitude and act on the same section, the pressure is equal

The resultant force of an object at rest is 0
I. e. that downward gravity of the mercury column is equal to the upward support force
The upward support comes from atmospheric pressure
When two forces are equal in magnitude and act on the same section, the pressure is equal