CHEMISTRY HIGH SCHOOL

Which liquid has the highest vapor pressure at 75°C?(1) ethanoic acid (3) propanone
(2) ethanol (4) water

Answers

Answer 1
Answer:

Answer:

1)  Ethanol

Explanation:

If we will have interactions we will need more energy to break them in order to go from liquid to gas. If we need more energy, therefore, the temperature will be higher.

In this case, we can discard the propanone because this molecule don't have the ability to form hydrogen bonds. (Let's remember that to have hydrogen bonds we need to have a hydrogen bond to a heteroatom, O, N, P or S).

Then we have to analyze the hydrogen bonds formed in the other molecules. For ethanol, we will have only 1 hydrogen bond. For water and ethanoic acid, we will have 2 hydrogen bonds, therefore, we can discard the ethanol.  

For ethanoic acid, we have 2 intramolecular hydrogen bonds. For water we have 2 intermolecular hydrogen bonds, therefore, the strongest interaction will be in the ethanoic acid.

The closer boiling point to the 75ºC is the ethanol (boiling point of 78.8 ºC) therefore these molecules would have enough energy to break the hydrogen bonds and to past from liquid to gas.
Answer 2
Answer:

Final answer:

Among Ethanoic Acid, Ethanol, Propanone, and Water, Propanone has the highest vapor pressure at 75°C because it has the weakest intermolecular forces, making it more likely to vaporize.

Explanation:

The vapor pressure of a substance is determined by how easily particles can escape from the liquid phase and become a gas. In general, the higher the temperature, the higher the vapor pressure.

The four liquids provided in your question are Ethanoic Acid, Ethanol, Propanone, and Water. At 75°C, Propanone is known to have the highest vapor pressure among the listed substances. This is because Propanone, also known as acetone, has weaker intermolecular forces and thus more readily vaporizes.

Learn more about Vapor Pressure here:

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Answers

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Marshall determines that a gas has a gage pressure of 276 kPa. What's the absolute pressure of this gas? A. 326 kPa
B. 156 kPa
C. 376 kPa
D. 176 kPa

Answers

Answer: The absolute pressure is 376 kPa.

Explanation :

The absolute pressure of a gas is defined as the sum of gauge pressure and the atmospheric pressure.

We know that the atmospheric pressure of a gas is 101.3 kPa.

So, Absolute pressure becomes 276 kPa + 101.3 kPa = 377.3 kPa

Approximately it can be written as, 376 kPa.

So, the correct option is (C) " 376 kPa ".

Hence, this is the required solution.

C.... 376 tbh just took the test and was right

What is the ratio of Al ions to S ions in a neutral compound?

Answers

Aluminum ions are usually +3 while sulfide ions are usually -2 which means that a neutral compound of aluminum sulfide would be Al₂S₃.  3×2=6 while -2×3=-6 and 6+-6=0.

I hope this helps.  Let me know if anything is unclear.

The bright-line spectrum of an element in the gaseous phase is produced as

Answers

Electrons move from higher energy states to lower energy states Hope this helped

If the following elements were to combine with each other, choose which demonstrate the Law of Multiple Proportion. Select all that apply. Z:X = 7:1 A:Z = 2.5:1 A:Z = 2.2:1 Y:X = 11:1

Answers

Answer is: Z:X = 7:1 and Y:X = 11:1.

Law of multiple proportions or Dalton's Law said that the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers. 
In this example ratios are whole numbers, A:Z = 2.5 : 1 and A:Z = 2.2 : 1 are not whole number ratios.

Answer:

7.1 and 11.1

Explanation:

Consider a generic redox reaction?Consider a generic redox reaction X(s) + Y^+(aq) <----> X^+(aq) + Y(s) then suppose that the coefficients in the redox reaction are doubled. How will the following quantities be affected for a voltaic cell under nonstandard conditions? 1.Doubled 2. Halved 3. Squared 4. No Change The options are InQ, E^o, E, n, Q

Answers

The Nernst equation allows us to predict the cell potential for voltaic cells under conditions other than the standard conditions of 1M, 1 atm, 25°C. The effects of different temperatures and concentrations may be tracked in terms of the Gibbs energy change ΔG. This free energy change depends upon the temperature & concentrations according to   ΔG = ΔG°  +  RTInQ  where ΔG° is the free energy change under conditions and Q is the thermodynamic reaction quotient. The free energy change is related to the cell potential  Ecell by ΔG= nFEcell

so for non-standard conditions
              -nFEcell = -nFE°cell  + RT InQ

or
   
              Ecell  =  E°cell - RT/nF (InQ) 

which is called Nernst equation.

Answer:

n and lnQ - doubled

Q - Squared

E, Edegree - No change
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