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larisa [96]
3 years ago
9

Which explains the basis of the biuret test?

Chemistry
1 answer:
Sladkaya [172]3 years ago
4 0
The answer is D because I  asked the teacher

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The vapor pressure of benzene is 73.03 mm Hg at 25°C. How many grams of estrogen (estradiol), C18H24O2, a nonvolatile, nonelectr
alexira [117]

Answer:

14.9802 grams of estrogen must be added to 216.7 grams of benzene.

Explanation:

The relative lowering of vapor pressure of solution containing non volatile solute is equal to mole fraction of solute.

\frac{p_o-p_s}{p_o}=\frac{n_2}{n_1+n_2}

Where:

p_o = Vapor pressure of pure solvent

p_s = Vapor pressure of the solution

n_1 = Number of moles of solvent

n_2 = Number of moles of solute

p_o = 73.03 mmHg

p_s= 71.61 mmHg

n_1=\frac{216.7 g}{78.12 g/mol}=2.7739 mol

\frac{73.03 mmHg-71.61 mmHg}{73.03 mmHg}=\frac{n_2}{2.7739 mol+n_2}

n_2=0.05499 mol

Mass of 0.05499 moles of estrogen :

= 0.05499 mol × 272.4 g/mol = 14.9802 g

14.9802 grams of estrogen must be added to 216.7 grams of benzene.

6 0
3 years ago
How important is the resonance structure shown here to the overall structure of carbon dioxide?
Tcecarenko [31]

1. Resonance structures are a better description of a Lewis dot structure .

2. Best resonance structure is the one with the least formal charge.


<u>EXPLAINATION OF RASONANCE STRUCTURE OF CARBON DIOXIDE</u>

1.Carbon dioxide has three resonance structures .

2. The CO2 molecule has a total of 16 valence electrons ,

  1C = 4 electrons

  2O= 12 electrons

<u>three resonance structures for  CO2</u>

1. The atoms in all three resonance structures have full octets;

 structure 1 will be more stable because it has no separation of charge.

2. Structures 2 and 3 show charge separation caused by the presence of formal charges on both oxygen atoms.  

6 0
3 years ago
The speed of sound in air at 20° C is 343 m/s. Its speed in water at 20° C is 1,483 m/s. How much longer would it take for sound
Alona [7]
<h3>Answer:</h3>

22.41 seconds longer

<h3>Explanation:</h3>
  • Sound is a longitudinal wave that requires a material medium for transmission hence called a mechanical wave.
  • Examples of medium in which sound travels in are water and air.

From the question give;

Speed of sound in air at 20°C is 343 m/s

Speed of sound in water at 20°C is 1,483 m/s

We are given a distance of 10 Km or 10,000 m

We need to finder how much longer it will take for the sound to travel in air.

Time = Distance ÷ Speed

Therefore;

Time taken in Air = Distance ÷ speed of sound in air

                             = 10000 m ÷ 343 m/s

                             = 29.15 seconds

Time taken in water = Distance ÷ speed of sound in water

                                 = 10,000 ÷ 1,483 m/s

                                 = 6.74 seconds

Difference in time = 29.15 seconds - 6.74 seconds

                              = 22.41 seconds

Therefore, it takes 22.41 seconds longer for sound to travel through air than water.

8 0
3 years ago
At approximately what temperature will 40g of argon gas at 2 atm occupy a volume of 22.4L
TEA [102]
Anejene e jejejejwj jejejsjs jdjdjej fefwghe
8 0
3 years ago
Read 2 more answers
The 4 in formula 4H2O is a<br><br>1. coefficient<br>2. subscript<br>3. superscript<br>4. binomial​
Rom4ik [11]
1. Coefficient

Since it is a number that constant for the given substance
7 0
2 years ago
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