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
ch4aika [34]
2 years ago
9

A student is extracting caffeine from water with dichloromethane. The K value is 4.2. If the student starts with a total of 30 m

g of caffeine in 2 mL of water and extracts twice with 2 mL of dichloromethane, how much caffeine will be in the dichloromethane extract
Chemistry
1 answer:
ella [17]2 years ago
8 0

Answer:

787.5 is a transversal of lines I and m that forms 8 angles and the other way around the world health organization and the other one is a transversal of lines I and m that forms 8 angles and the other things that you can see in the picture of with the first term 8 and a common ratio of the following values would be a little different to the one you have the

You might be interested in
The car wit fastest acceleration is the tempest. it has an acceleration of 6.1 m/s. suppose the car accelerates from rest to a f
ziro4ka [17]

<u>Given:</u>

Initial velocity (v1) = 0 m/s

Final velocity (v2) = 30 m/s

Acceleration (a) = 6.1 m/s2

<u>To determine:</u>

The time (t) taken to reach the final speed

<u>Explanation:</u>

Use the relation:

Acceleration (a) = [final velocity(v2) - initial velocity (v1)]/time (t)

t = (v2-v1)/a = 30-0/6.1 = 4.92 s

Ans: Time taken is around 4.9 s

3 0
3 years ago
Observe the image of sodium. List the properties you see.
tatyana61 [14]

Answer:

It is soft and white. It has a low melting and boiling point, a good conductor electricity, and reacts with water. Furthermore, it is also highly reactive, malleable, and ductile.

Explanation:

Hope I helped!

4 0
3 years ago
Read 2 more answers
Homes in rural areas where natural gas service is not available often rely on propane to fuel kitchen ranges. The propane is sto
Neporo4naja [7]

Answer:

2666.7 hours

Explanation:

The key to solve this problem is that we are given the propane gas consumed in one hour by giving us the information of the volume consumed at 1 atm, 298 K (25 +273). Using the gas law we can calculate the rate of consumption  of propane per hour, and from here we can calculate its mass and converting it to gallons and finally diving the 400 gallos by this number.

PV = nRT ∴ n = PV/RT

n = 1 atm x 165 L/ (0.08206 Latm/kmol x 298 K ) = 6.75 mol propane

Mass propane :

6.75 mol x 44 g/mol = 296.88 g

convert this to Kg:

296.88 g/ 1000 g/Kg = 0.30 Kg

calculate the volume in liters this represents by dividing by the density:

0.30 Kg / 0.5077 Kg/L =  0.59 L

changing this to gallons

0.59 L x  1 gallon/3.785 L = 0.15 gallon

and finally calculate how many hours the 400 gallons propane tank will deliver

400 gallon/ 0.15 gallon/hr = 2666.7 hr

6 0
3 years ago
If an acid has a Ka of 4.3 × 10-7 and a base has a Kb of 5.6 × 10-4, then what will be true about the salt produced? A. The salt
blsea [12.9K]

If an acid has a Ka of 4.3 × 10-⁷ and a base has a Kb of 5.6 × 10-⁴, then the true statement about the salt produced is that the salt would decrease the pH of the solution.

<h3>What is acid and base constant?</h3>

An acid dissociation constant, Kₐ, is a quantitative measure of the strength of an acid in solution while Kb indicates the high level of dissociation of a strong base.

According to this question, an acid has a Ka of 4.3 × 10-⁷ and a base has a Kb of 5.6 × 10-⁴. This shows that the strength of the base is higher than that of the acid.

Therefore, if an acid has a Ka of 4.3 × 10-⁷ and a base has a Kb of 5.6 × 10-⁴, then the true statement about the salt produced is that the salt would decrease the pH of the solution.

Learn more about Ka at: brainly.com/question/16035742

#SPJ1

7 0
2 years ago
Show the calculation of the energy involved in condensation of 150 grams of steam at 100oC if the Heat of Vaporization for water
vaieri [72.5K]

Answer : The energy involved in condensation is, 339 kJ

Explanation :

Formula used :

q=m\times L

where,

q = heat required = ?

L = latent heat of vaporization of water = 2.26kJ/g

m = mass of water = 150 g

Now put all the given values in the above formula, we get:

q=(150g)\times (2.26kJ/g)

q=339kJ

Therefore, the energy involved in condensation is, 339 kJ

4 0
3 years ago
Other questions:
  • Ice melting, water boiling, lighting a match, grape juice freezing. Which statement describes evidence of a chemical reaction
    6·1 answer
  • 1. Which processes are taking place in the system represented by the following equation?
    14·1 answer
  • What is the molarity of an H3PO4solution if 15.0 mL is completely neutralized by 38.5 mL of 0.150 MNaOH? Please explain your ans
    9·1 answer
  • Given the balanced equation representing a reaction:
    14·1 answer
  • Suppose you fill a glass with ice cubes. When the ice cubes melt, is the glass still full? Explain your answer.
    15·1 answer
  • Which of the following is a synthesis reaction?
    12·2 answers
  • A filament at which temperature would have the most light absorbed by a piece of yellow glass?
    15·1 answer
  • Explain how how radioactive decay can result in one element changing into another?
    14·1 answer
  • Name the following bases.
    6·1 answer
  • 7. Diethyl ether burns in air according to the following equation. C4H10O(l) + 6O2 (g) → 4CO2 (g) + 5H2O(l) If 7.15 L of CO2 is
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!