Calculate the final temperature of a sample of argon of mass 12.0 g at 273.15 K that is expanded reversibly and adiabatically from 1.0 dm3 to 3.0 dm3. The isochoric heat capacity for argon is 12.48 J/K.mol.

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Which of the following aqueous solutions will have the lowest vapor pressure at 25 degrees Celsius?a. 1.0 M CH4
b. 1.0 M NaCl
c. 1.0 M AlCl3
d. 1.0 M BaCl2

Answers

The choices experiences colligative properties. These set of properties depend on the amount of solute dissolved in a solvent. These properties include freezing point depression, boiling point elevation, osmotic pressure and vapor pressure lowering. From the choices, the correct answer is A.

Answer : The correct option is, (C) 1.0 M $AlCl_3$

Explanation :

According to the relative lowering of vapor pressure, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component of the solution multiplied by the vapor pressure of that component in the pure state.

1.0 M means that the 1.0 moles of solute present in 1 liter of solution.

Formula used :

$(\Delta p)/(p^o)=i* X_B$

where,

$p^o$ = vapor pressure of the pure component (water)

$p_s$ = vapor pressure of the solution

$X_B$ = mole fraction of solute

i = Van't Hoff factor

As we know that the vapor pressure depends on the mole fraction of solute and the Van't Hoff factor.

So, the greater the number of particles of solute dissolved the lower the resultant vapor pressure.

(a) The dissociation of 1.0 M $CH_4$ is not possible because it is a non-electrolyte solute. So, the Van't Hoff factor will be, 1.

(b) The dissociation of 1.0 M $NaCl$ will be,

$NaCl\rightarrow Na^++Cl^-$

So, Van't Hoff factor = Number of solute particles = $Na^++Cl^-$ = 1 + 1 = 2

(c) The dissociation of 1.0 M $AlCl_3$ will be,

$AlCl_3\rightarrow Al^(3+)+3Cl^(-)$

So, Van't Hoff factor = Number of solute particles = $Al^(3+)+3Cl^(-)$ = 1 + 3 = 4

(c) The dissociation of 1.0 M $BaCl_2$ will be,

$BaCl_2\rightarrow Ba^(2+)+2Cl^(-)$

So, Van't Hoff factor = Number of solute particles = $Ba^(2+)+2Cl^(-)$ = 1 + 2 = 3

From this we conclude that, 1.0 M $AlCl_3$ has the highest Van't Hoff factor which means that the solution will exhibit the lowest vapor pressure.

Hence, the correct option is, (C) 1.0 M $AlCl_3$

Which organic compound is most soluble in water? A) ethyne B) benzene C) butane D) ethanol

Answers

I think it's between B) Benzene and C) Butane

Pre-shaped plastic or aluminum enhancements used as a guide to extend nail enhancements beyond the fingertip for additional length are called:

Answers

Answer:

Multiuse nail forms.

Explanation:

Hello,

Nails extensions have been widely used to provide nails an extra length which is supposed to enhance the nails appearance. In such a way, different types of materials have been enforced in the light of the creation of those extensions which are known as multiuse nail forms which are pre-shaped plastic or aluminum enhancements used as a guide to extend nail enhancements beyond the fingertip for additional length. Materials such as cyanoacrylate (derived from acrylates) and aluminium turn out suitable for the manufacture of those multiuse nail forms as they provide stability during nail enhancement practices.

Best regards.

The tempertaure at which the pressure of the vapor of a liquid is equal to the external pressure acting on the surface of the liquid?

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Answer: Boiling point

Explanation:

Boiling point is the temperature where the vapor pressure of a liquid equals the pressure of the gas present above it.

The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere.

Boiling point depends on the intermolecular forces present between the molecules. More are the intermolecular forces, lesser will be the vapor pressure and thus more heat will be supplied to make vapor pressure equal to the atmospheric pressure. Thus higher will be the boiling point.

Normal boiling point for water is $100^0C$ .

What is a common use of nitric acid?

Answers

We can see here that some common uses of nitric acid:

Manufacturing of Fertilizers: Nitric acid is a key component in the production of nitrogen-based fertilizers, such as ammonium nitrate and urea.

Production of Explosives: Nitric acid is used in the manufacturing of explosives, including dynamite, trinitrotoluene (TNT), and nitroglycerin.

What is nitric acid?

Nitric acid is a highly corrosive and strong mineral acid. It is a clear or yellowish liquid that is commonly used in various industrial, laboratory, and chemical applications.

In its pure form, nitric acid is a colorless liquid, but it can have a yellowish tint due to the presence of nitrogen dioxide, which forms when nitric acid reacts with air.

Learn more about nitric acid on brainly.com/question/22698468

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Answer: Nitric acid is used in the production of ammonium nitrate and calcium ammonium nitrate which find applications as fertilizers. Ammonium nitrate is also used in the manufacturing of urea ammonium nitrate (UAN) used in fertilizer formulations and also as explosives.

Explanation:

A baker touches a pie right after taking it out of the oven. Which statement best explains why the pie feels hot?

Answers

The pie is going to be hot right when it comes out of the oven because the oven uses air to transfer heat. The air warms at the bottom of the oven and the air rises to the top of the oven where your food is. This is why any food is going to be hot right after you take it out of an oven.

Answer:

Molecules in the pie move faster than molecules in the skin, so heat is transferred to the skin.

Explanation:

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