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
Travka [436]
3 years ago
8

Methylamine (ch3nh2) is a weakly basic compound. calculate the kb for methylamine if a 0.253 m solution is 4.07% ionized.

Chemistry
1 answer:
MariettaO [177]3 years ago
8 0
Answer is: Kb for methylamine is 4.37·10⁻⁴.<span>
Chemical reaction: CH</span>₃NH₂ + H₂O → CH₃NH₃⁺ + OH⁻.
c(CH₃NH₂) = 0.253 M.
α = 4.07% ÷ 100% = 0.0407.
[CH₃NH₃⁺] = [OH⁻] = c(CH₃NH₂) · α.
[CH₃NH₃⁺] = [OH⁻] = 0.253 M · 0.0407.
[CH₃NH₃⁺] = [OH⁻] = 0.0103 M.
[CH₃NH₂] = 0.253 M - 0.0103 M.
[CH₃NH₂] = 0.2427 M.
Kb = [CH₃NH₃⁺] · [OH⁻] / [CH₃NH₂]. 
Kb = (0.0103 M)² / 0.2427 M.
Kb = 4.37·10⁻⁴.
You might be interested in
How does thermal energy
BartSMP [9]
Objects would be like a lap, stove, & microwave. There’s many options.
4 0
3 years ago
Iron has density 7.87 g/cm^3. if 52.4 g of iron is added to 75.0 mL of water in a graduated cylinder, to what volume reading wil
vlada-n [284]

Answer:

6.66 mL

Explanation:

The increase in the volume is due to the addition of the iron whose volume can be calculated as:

Using,

Density = Mass / Volume

Given that:

Density of Iron = 7.87 g/cm³

Mass of iron = 52.4 g

Thus, volume is:

Volume = Mass / Density = 52.4 / 7.87 cm³ = 6.66 cm³

Also, 1 cm³ = 1 mL

<u>The rise in the volume = 6.66 mL</u>

8 0
3 years ago
A photon has 8.0 × 10–15 J of energy. Planck’s constant is 6.63 × 10–34 J•s. What is the frequency of the photon
german
The formula is:
frequency * h (Planck's constant) = Energy
So, to find frequency you need just divide energy by the constant:
frequency = (8 * 10^-15 J) / (6.63 * 10^-34 J*s) = 1.2 * 10^19 1/s or 1.2 * 10^19 Hz
5 0
4 years ago
Read 2 more answers
80 protons, 119 neutron
g100num [7]
Mercury-199 is composed of 80 protons, 119 neutrons, and 80 electrons.
4 0
3 years ago
What are the tube feet on a star fish
Snezhnost [94]
They are used to pass food to the oral mouth at the center, and can attach to surfaces.
8 0
3 years ago
Read 2 more answers
Other questions:
  • The reason H2S exists as a gas while H2O exists as a liquid at room temperature is because:
    11·1 answer
  • What process transform solar energy into chemical energy?
    9·1 answer
  • You are given a solution of sugar and sand and water your task is to separate sugar from sand which of the following experimenta
    12·1 answer
  • In any energy conversion, some of the energy is lost to the environment as
    12·1 answer
  • Problem PageQuestion In the Hall-Heroult process, a large electric current is passed through a solution of aluminum oxide dissol
    14·1 answer
  • What is the best description of the paths of S waves and P waves? S waves travel through solids or very dense, glassy liquids. P
    9·1 answer
  • Which type of erosion most likely formed the Grand Canyon?
    10·1 answer
  • In a typical ecosystem, the largest amount of biomass should be found at which level?
    15·1 answer
  • Which describes a stationary reference point?
    13·1 answer
  • _______ is an example for isotone. a)argon and carbon b) uranium and carbon c) carbon and boron d)sulphur and boron.​
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!