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Law Incorporation [45]
3 years ago
7

Imagine two solutions with the same concentration and the same boiling point, but one has benzene as the solvent and the other h

as carbon tetrachloride as the solvent. Determine that molal concentration, m (or b), and boiling point, Tb.benzene boiling point=80.1 Kb=2.53carbon tetrachloride boiling point=76.8 Kb=5.03
Chemistry
1 answer:
Gnoma [55]3 years ago
6 0

Explanation:

We know that relation between change in temperature and molality is as follows.

           \Delta T = m \times k_{b}

And, boiling point of a solution is calculated as follows.

 Boiling point of a solution = Boiling point + \Delta T (k_{c} \times m)

For benzene solution, the boiling point is 80.1 + 2.53m.

For CCl_{4} solution, the boiling point is 76.8 + 5.03m

Now, equating the boiling point of both the solutions as follows.

          80.1 + 2.53m = 76.8 + 5.03m    

                3.3 = 2.5 m

               m = 1.32 mol of solute per kg of solvent

Therefore, the boiling point will be calculated as follows.

             80.1 + 2.53m

         80.1 + 2.53 \times 1.32      

          = 83.43^{o}C

Thus, we can conclude that molal concentration (m) is 1.32 and boiling point is 83.43^{o}C.          

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ratelena [41]

Answer:

Both oil and gasoline molecules are nonpolar, while water is polar. Nonpolar solvents have a tendency to dissolve other nonpolar molecules.

Explanation:

Molecules may be categorized as "polar" or "nonpolar" according to <em>difference in the atom's electronegativity.</em>

<u>Water is polar</u> because it consists of two types of atoms that<em> do not cancel out each other.</em> It is made of two atoms of Hydrogen and only one atom of Oxygen. This makes the Oxygen<u> partially negative</u> and the Hydrogen <u>partially positive.</u> This allows them to readily bond with other polar molecules like sugar. However, it cannot mix freely with oil and gasoline because<em> both of these are nonpolar. </em>Nonpolar molecules do not have much difference when it comes to their atoms' electronegativity. <em>Therefore, they have the tendency to dissolve molecules which are nonpolar as well. </em>This explains why oil molecules can mix freely with gasoline.

5 0
2 years ago
What is the major role of wind on earth?
Studentka2010 [4]

Answer: Wind, in climatology, the movement of air relative to the surface of the Earth. Winds play a significant role in determining and controlling climate and weather.

3 0
3 years ago
Read 2 more answers
Calculate the empirical formula of each of the following substances with the following compositions.
OleMash [197]

Explanation:

Note: Molar masses of elements can be found online or in the periodic table.

Moles of Magnesium

= 3.60g / (24.3g/mol) = 0.148mol.

Moles of Chlorine

= 10.65g / (35.45g/mol) = 0.300mol.

Mole ratio of Magnesium to Chlorine

= 0.148mol : 0.300mol = 1 : 2.

Hence we have the empirical formula MgCl2.

Moles of Lithium

= 9.1g / (6.94g/mol) = 1.311mol.

Moles of Oxygen

= 10.4g / (16g/mol) = 0.650mol.

Moles ratio of Lithium to Oxygen

= 1.311mol : 0.650mol = 2 : 1.

Hence we have the empirical formula Li2O.

7 0
2 years ago
Calculate the formula/molecular mass of following
ddd [48]

Answer:

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2 years ago
Identify the change in state that does not have an increase in entropy. a. Water evaporating b. Dry ice subliming c. Water boili
jarptica [38.1K]

Answer:

E. Water Freezing

Explanation:

Entropy refers to the degree of disorderliness of a system.  

A. Water Evaporating: There is an increase in entropy, this is because the phase change is from liquid to gas. Gas particles are more disordered than liquid.

B. Dry Ice sublimating: Sublimating refers to a phase change from solid to gas. This is an increase in entropy, this is because the gas particles are more disordered than solid particles

C. Water Boiling: The phase change is from liquid to gaseous state. There is an increase in entropy. Gas particles are more disordered than liquid.

D. Ice melting: The phase change is from solid to liquid state. There is an increase in entropy. Liquid particles are more disordered than that of solid.

E. Water Freezing: The phase change is from liquid to solid state. There is a decrease in entropy. solid particles are less disordered than those of liquid.

4 0
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