1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Usimov [2.4K]
3 years ago
9

The energy required to ionize a mole of potassium ions is 419 kJ/mol . What is the longest wavelength of light capable of this i

onization?
Chemistry
1 answer:
liraira [26]3 years ago
3 0
<span>First divide the ionization energy by Avogadro's number to get the energy per atom of potassium;
</span>419 kj/mol / 6.023 x 10²³
= 4.19 x 10⁵ / 6.023 x 10²³ = 6.96 x 10⁻¹⁹
E = hc/λ
where lambda (λ<span>) is the wavelength, h is Planck's constant, c is the speed of light 
</span>E = 6.96 x 10⁻¹⁹ j/atom<span>
h =</span>6.63x10⁻³⁴<span> Js
c = 3 x 10</span>⁸ m/s
λ = ?
λ = hc/E = (6.63x10⁻³⁴ x 3 x 10⁸ ) / 6.96 x 10⁻¹⁹ = 285.8nm = 286nm
<span>The longest wavelength of light capable of this ionization is 286nm.</span>
You might be interested in
For which of the following materials is necessary to stop a beta particle?
tensa zangetsu [6.8K]
Hello.

The answer would be <span>A. Three feet of concrete.

Have a nice day.</span>
8 0
3 years ago
Es una mescla arena con agua
bearhunter [10]
We can’t understand u to answer this
8 0
2 years ago
Read 2 more answers
What is the molecular formula of the compound CH2 with molar mass = 42.0 g/mol? A. C2H18 B. C2H4 C. CAHg O D. C3H6​
nika2105 [10]

Answer:

i think c

Explanation:

4 0
2 years ago
Read 2 more answers
If 3.0 moles of x and 4.0 moles of y react according to the hypothetical reaction below, how many moles of the excess reactant w
Umnica [9.8K]
Answer is: <span>1.0 mol X left over. 
</span>Chemical reaction: X + 2Y → XY₂.
n(X) = 3,0 mol, excess reactant.
n(Y) = 4,0 mol, limiting reagent.
n - amount of substance.
from reaction: n(X) : n(Y) = 1 : 2.
n(X) : 4 mol = 1 : 2.
n(X) = 2 mol, that reacts.
excess of X: 3 mol - 2 mol = 1 mol.

4 0
3 years ago
All the objects in the force diagrams shown below have the same mass.
Stolb23 [73]

Answer:

do u know what the answer is yet

Explanation:

3 0
2 years ago
Other questions:
  • Mercury has an atomic number of 80 and a mass number of 200.
    12·2 answers
  • How many cups are in a pound of flour?
    13·1 answer
  • According to the Lewis dot structure shown here how may valence electrons does chlorine have
    14·1 answer
  • Where photosynthesis takes place?
    15·1 answer
  • 23 degrees celcius is in farienhiet
    14·1 answer
  • PLEASE HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE!!!
    11·2 answers
  • Laser fusion Group of answer choices uses chemical reactions to produce energy uses nuclear reactions to produce energy implodes
    14·1 answer
  • Plz help me I am timed
    11·2 answers
  • Who had a good thanksgiving :D!!!
    15·2 answers
  • A potassium atom (atomic number 19) and a bromine atom (atomic number 35) can form a chemical bond through a transfer of one ele
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!