Answer:
The answer is 434nm
Explanation:
The Rydberg equation is an empirical relationship expressed by Balmer and Rydberg which is stated as:
1/λ = 
.............................. (1)
where λ is the wavelength, 
is the Rydberg constant equal to 
, n is the transition level number, the subscript f and i are the final and initial levels respectively. Therefore for final transition n = 2 and for initial transition n = 5.
Making substitutions into equation (1), gives
1/λ = 
= 
= 
= 
= 2303700
∴ λ = 
Converting to nm, we have
λ = 
Therefore, the wavelength of the emitted photon is 434nm
The reagent which is used is "NaI", that is Sodium iodide.
When the reagent sodium iodide is added to distinguish the Ag⁺ ions and Fe³⁺ ions, it will react and form precipitate with one, while have no precipitates formed with the other, so that is how we can distinguish both of them.
Yes, very informational. thank you.
25.9 kJ/mol. (3 sig. fig. as in the heat capacity.)
<h3>Explanation</h3>
The process:
.
How many moles of this process?
Relative atomic mass from a modern periodic table:
- K: 39.098;
- N: 14.007;
- O: 15.999.
Molar mass of 
:
.
Number of moles of the process = Number of moles of dissolved:
.
What's the enthalpy change of this process?
for 
. By convention, the enthalpy change 
measures the energy change for each mole of a process.
.
The heat capacity is the least accurate number in these calculation. It comes with three significant figures. As a result, round the final result to three significant figures. However, make sure you keep at least one additional figure to minimize the risk of rounding errors during the calculation.
