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nikitadnepr [17]
3 years ago
5

How many cm is equal to 1450 nm?

Chemistry
1 answer:
grigory [225]3 years ago
3 0

Answer:

The answer is D; 1.45 x 10^-4

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Will give lots of points if answered correctly. Determine the kb for chloroform when 0.793 moles of solute in 0.758 kg changes t
Liono4ka [1.6K]

Answer: The value of K_{b} for chloroform is 3.62^{o}C/m when 0.793 moles of solute in 0.758 kg changes the boiling point by 3.80 °C.

Explanation:

Given: Moles of solute = 0.793 mol

Mass of solvent = 0.758

\Delta T_{b} = 3.80^{o}C

As molality is the number of moles of solute present in kg of solvent. Hence, molality of given solution is calculated as follows.

Molality = \frac{no. of moles}{mass of solvent (in kg)}\\= \frac{0.793 mol}{0.758 kg}\\= 1.05 m

Now, the values of K_b is calculated as follows.

\Delta T_{b} = i\times K_{b} \times m

where,

i = Van't Hoff factor = 1 (for chloroform)

m = molality

K_{b} = molal boiling point elevation constant

Substitute the values into above formula as follows.

\Delta T_{b} = i\times K_{b} \times m\\3.80^{o}C = 1 \times K_{b} \times 1.05 m\\K_{b} = 3.62^{o}C/m

Thus, we can conclude that the value of K_{b} for chloroform is 3.62^{o}C/m when 0.793 moles of solute in 0.758 kg changes the boiling point by 3.80 °C.

7 0
3 years ago
PLSSS HELP ME THIS IS FOR SIENCE PLLLLSSSSS
pickupchik [31]

Answer:

Conduction

Explanation:

I took the course

8 0
3 years ago
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Dry ice, or solid cabon dioxide, has the molecular formula of CO2. How should you classify it?
Marina86 [1]
You  should classify it as  co2 solid as CO2(s) and that small left comes to the bottom right hand side and dry ice is a form of liquid carbon dioxide so u should write it as CO2(l) and that L comes to the bottom right hand sise
6 0
3 years ago
Write a summary explaining how photosynthesis is occurring in this drawing
Virty [35]

Answer:

In the picture, it's shown that the energy from the sun and carbon dioxide is absorbed by plants through the leaf and is used for cooking food in plants. It is also shown that nutrients and water needed for the plant is absorbed through the roots of the plant. And it's also shown that cooking results in the formation of Glucose and Oxygen in which oxygen is released into the atmospehere and the glucose is stored in the plant for its own needs.

7 0
3 years ago
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Chemical energy is a form of _____ energy.
inn [45]

Answer: Option (d) is the correct answer

Explanation:

The energy present within the bonds of the atoms of a compound or molecule is known as chemical energy.

As this energy is present at a position that is, within the bonds hence it is a potential energy. So, whenever there occurs a chemical reaction the stored chemical energy is released.

As potential energy is the energy possessed because of position of a substance. And, kinetic energy is the energy present due to the motion of an object.

Therefore, we can conclude that chemical energy is a form of potential energy.

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