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Vlada [557]
3 years ago
9

A sample of nitrogen gas is collected over water at temperature of 20.0˚C. What is the pressure of the nitrogen gas if atmospher

ic pressure is 1.01atm? (vapor pressure of water at 20.0˚C is 17.5 torr)
Chemistry
1 answer:
Levart [38]3 years ago
4 0

Answer:

P_N=0.987atm

Explanation:

Hello there!

In this case, for these problems about collecting a gas over water, we must keep in mind that once the gas has been collected, the total pressure of the system is given by the atmospheric pressure, in this case 1.01 atm. Next, since we also have water in the mixture, we can write the following equation:

P_T=P_w+P_N

Thus, by solving for the pressure of nitrogen and using consistent units, we obtain:

1.01atm=17.5torr*\frac{1atm}{760torr} +P_N\\\\P_N=1.01atm-0.023atm\\\\P_N=0.987atm

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an unknown molecule is found to consist of 24.2% carbon by mass, 4.0% hydrogen by mass and the remaining mass is due to chlorine
Paha777 [63]

Answer:

C3 H6 Cl 3

Explanation:

C -24.2%

H -  4.0%

Cl - (100-24.2 - 4.0)=73.8 %

We can take 100g of the substance, then we have

C -24.2 g

H -  4.0 g

Cl - 73.8 g

Find the moles of these elements

C -24.2 g/12.0 g/mol =2.0 mol

H -  4.0 g/1.0 g/mol = 4. 0 mol

Cl - 73.8 g/ 35.5 g/mol = 2.1 mol

Ratio of these elements gives simplest formula of the substance

C : H : Cl = 2 : 4 : 2 = 1 : 2 : 1

CH2Cl

Molar mass (CH2Cl) = 1*12.0 +2*1.0 + 1*35.5 = 49.5 g/mol

Real molar mass = 150  g/mol

real molar mass/ Molar mass (CH2Cl) = 150 /49.5=3

So, Real formula should be C3 H6 Cl 3.

4 0
3 years ago
Read 2 more answers
how much heat will be absorbed by 25g of chloroform when its temperature started at 67.0C and after it was 112.0C
snow_tiger [21]

Hello friend ☺

ΔH = MCΔT

ΔH = to the amount of energy or change in energy (J)

mass of water

C = waters specific heat capacity

ΔT = change in temperature

and so ΔH = 25 × 4.18 × ( 112-67 ) J = 4702.5 J

Thanks ❤

8 0
3 years ago
Are the bonds in each of the following substances ionic, nonpolar covalent, or polar covalent? Arrange the substances with polar
KengaRu [80]

Covalent bonds can be classified as nonpolar and polar covalent given the electronegativity difference between two atoms (ΔEN).

Nonpolar covalent bond electrons are shared equally between two atoms, polar covalent bond electrons are shared unequally, atoms have partial charges, ionic bond electrons are completely transferred to one atom, full charges present. Therefore, the greater the electronegativity difference, the greater the bond polarity. Let's determine the types of bonds present in the compounds and arrange the ones with polar covalent in order of increasing ΔEN. Sulfur and oxygen are both nonmetals so the substance is covalent. Sulfur has EN = 2.5 and oxygen has EN = 3.5. Since there is an electronegativity difference, the S−O bonds in the substance can be classified as polar covalent bonds.

Learn more about polar covalent bond here:

brainly.com/question/25150590

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3 0
1 year ago
Benzene can be nitrated with a mixture of nitric and sulfuric acids. How do we do that?
Montano1993 [528]

Answer:

We can do the nitration of benzene by treating the benzene with a mixture of nitric acid and sulphuric acid by not extending the temperature of 50°C

Explanation:

Nitration of benzene takes place by treating the benzene with a mixture of nitric acid and sulphuric acid at low temperatures such as the temperatures below 50°C

The nitration of benzene takes place through electrophilic substitution reaction

In this reaction the electrophile is nitronium ion (NO2+) which performs an electrophilic substitution reaction on the benzene ring and during the reaction an intermediate will also be formed in which there will be positive charge distributed in the benzene

These electrophile is generated when nitric acid is treated with sulphuric acid

As nitric acid is a strong oxidising agent, here in this case the oxidation state of nitrogen will change from +5 to +3

The reactions regarding the nitration of benzene is present in the file attached

5 0
3 years ago
50 compounds in chemistry<br>​
Lana71 [14]

Answer:

\Large \boxed{\mathrm{view \ explanation}}

Explanation:

Chemical compounds are substances that contain two or more elements that are chemically bonded together.

Here are 50 chemical compounds:

  1. Hydrogen peroxide
  2. Fructose
  3. Sulfur hexafluoride
  4. Glucose
  5. Sulfuric acid
  6. Calcium nitrate
  7. Nitrous oxide
  8. Calcium sulfate
  9. Ammonia
  10. Hydrochloric acid
  11. Potassium nitrate
  12. Potassium nitrite
  13. Sucrose
  14. Methane
  15. Carbon dioxide
  16. Dihydrogen oxide
  17. Putrescine
  18. Chloroform
  19. Ethene
  20. Hydrazine
  21. Sodium bicarbonate
  22. Sodium chloride
  23. Acetate
  24. Magnesium sulfate
  25. Urethane
  26. Butyne
  27. Nicotine
  28. Maltose
  29. Propene
  30. Tartaric acid
  31. Nitrogen dioxide
  32. Butane
  33. Butene
  34. Propane
  35. Pentane
  36. Hexane
  37. Benzene
  38. Isobutane
  39. Ovalene
  40. Coronene
  41. Pyrene
  42. Chrysene
  43. Napthalene
  44. Acetic acid
  45. Barium iodide
  46. Aluminium oxide
  47. Aluminium fluoride
  48. Styrene
  49. Toluene
  50. Vinyl chloride
5 0
2 years ago
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