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
Alisiya [41]
3 years ago
7

How many feet are contained in .399 km

Chemistry
1 answer:
stiks02 [169]3 years ago
7 0
1309.0551181 feet are contained in .399 km
You might be interested in
Why does Earthquakes occur?
Annette [7]
Shifting plates, underwater volcanoes. many different variables come in play
6 0
3 years ago
A gas that effuses through a porous cylinder 1.87 times faster than chlorine gas. what is the molar mass and identity.
Rufina [12.5K]
From the Graham's law of effusion;
R1/R2 = √MM2/√MM1
Molar mass of chlorine gas is 71
Therefore;
1.87= √ 71 /√mm1
= 1.87² = 71/mm1 
mm1 = 71/1.87²
         = 71/3.4969
         = 20.3
Thus, the molar mass of the other gas is 20.3 , and i think the gas is neon
6 0
3 years ago
How many atoms are in 68.44 grams
creativ13 [48]
Correct answer There are 68 grams are in atoms
3 0
3 years ago
How the calculation of the [OH-], pH and % ionization for 0.619 M ammonia (NH3) NH3 + H2O (liq) rightwards harpoon over leftward
fomenos

Answer:

[OH⁻] = 3.34x10⁻³M; Percent ionization = 0.54%; pH = 11.52

Explanation:

Kb of the reaction:

NH3 + H2O(l) ⇄ NH4+ + OH-

Is:

Kb = 1.8x10⁻⁵ = [NH₄⁺] [OH⁻] / [NH₃]

<em>As all NH₄⁺ and OH⁻ comes from the same source we can write: </em>

<em>[NH₄⁺] = [OH⁻] = X</em>

<em>And as </em>[NH₃] = 0.619M

1.8x10⁻⁵ = [X] [X] / [0.619M]

1.11x10⁻⁵ = X²

3.34x10⁻³ = X = [NH₄⁺] = [OH⁻]

<h3>[OH⁻] = 3.34x10⁻³M</h3><h3 />

% ionization:

[NH₄⁺] / [NH₃] * 100 = 3.34x10⁻³M / 0.619M * 100 = 0.54%

pH:

As pOH = -log [OH-]

pOH = 2.48

pH = 14 - pOH

<h3>pH = 11.52</h3>
5 0
2 years ago
3 points Given 0.65 moles KNO3: (a) Convert to grams (b) Convert to particles. <br>​
Vlad [161]

Answer: Convert to grams

Explanation:

8 0
3 years ago
Other questions:
  • How does the compound shown in part 5a of the transparency differ from the elements that comprise it?
    12·1 answer
  • A liquid with a high surface tension exhibits __________.
    10·2 answers
  • True or false, cilia and mucus help keep our lungs clean and healthy?
    6·1 answer
  • In an electrical neutral Atom,..
    6·2 answers
  • Protein structure characterized by the combination of different proteins that all together are required for protein function in
    5·1 answer
  • Miguel’s family drove 357 miles on their weekend trip. Their car’s average gas mileage was 25.5 miles per gallon. How many gallo
    13·2 answers
  • How many Joules are there in 3301 calories? (1 cal = 4.18 J)
    10·2 answers
  • Please help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    9·1 answer
  • PLEASE I NEED HELP ASAP!!!!
    8·1 answer
  • Identify the classification of whipped cream. group of answer choices aerosol solid aerosol foam emulsion solid emulsion
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!