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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

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Given the two reactions PbCl2(aq)⇌Pb2+(aq)+2Cl−(aq), K3 = 1.89×10−10, and AgCl(aq)⇌Ag+(aq)+Cl−(aq), K4 = 1.25×10−4, what is the
Sergio [31]

Answer:

1.2\times 10^{-2}

Explanation:

The given reactions are:

PbCl2(aq)⇌Pb2+(aq)+2Cl−(aq)     K_3 = 1.89\times 10^{-10}

AgCl(aq)⇌Ag+(aq)+Cl−(aq)           K_4 = 1.25\times 10^{-4}

Required reaction is:

PbCl2(aq)+2Ag+(aq)⇌2AgCl(aq)+Pb2+(aq)

K_f = \frac{K_3}{K_4^2}\\=\frac{1.89\times 10^{-10}}{1.25\times 10^{-4}}^2\\=1.2\times 10^{-2}

4 0
3 years ago
All of the following are true statements about catalysts except: Select one: a. A catalyst will speed the rate-determining step
liberstina [14]
<span>d. A catalyst will be used up in the reaction is wrong,
amount of catalyst should not change</span>
6 0
3 years ago
Element X consist of two isotopes with masses of 62.9 and 64.9. The relative atomic mass of the element is 63.6. What is th
koban [17]

Answer:

it is 50%

Explanation:

62.9x50=3145

64.9x50=3245

3245+3145=6390

6390/100=63.9

4 0
2 years ago
Conduction, convection, and radiation are three means by which _____________ may be transferred.
Vaselesa [24]
The correct answer to this question would be heat energy

8 0
3 years ago
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Land is a natural resource because it is used by living things to meet their needs. O True
blondinia [14]

Answer:

Absolutely True :) cause we use it all the time

7 0
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