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lukranit [14]
2 years ago
7

Rank the following compounds in order of decreasing boiling point: potassium fluoride (KF), acetylene (C2H2), and formaldehyde (

CH2O)
Chemistry
1 answer:
otez555 [7]2 years ago
8 0

Answer: KF > CH_2O > C_2H_2

Explanation:

The order of boiling point depends upon the type of interactions present between the molecules.

Potassium fluoride (KF) is an ionic compound and the opposite ions are held together by strong electrostatic forces.

C_2H_2 is a covalent compound and the molecules are held together by weak van der Waals' forces.

Formaldehyde is a polar compound due to presence of polar carbonyl group. Hence dipole-dipole force is present between formaldehyde molecules.

Thus the decreasing order of boiling point is:

KF > CH_2O > C_2H_2

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Find the number of molecules in .815 mole of O2​
Simora [160]

Answer:

4.9 × 10²³ molecules

Explanation:

Given data:

Number of molecules = ?

Number of moles of oxygen = 0.815 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

0.815 mol  ×  6.022 × 10²³ molecules  / 1 mol

4.9 × 10²³ molecules

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2 years ago
The airplanes parts and functions​
SpyIntel [72]

Answer: The main sections of an airplane include:

fuselage: The plane’s body, or fuselage, holds the aircraft together, with pilots sitting at the front of the fuselage, passengers and cargo in the back.

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Cockpit: The cockpit is the area at the front of the fuselage from which a pilot operates the plane

Engine: The engine(s), or powerplant, of an aircraft creates thrust needed for the plane to fly.

Propeller: An aircraft’s propeller(s) are airfoils, similar to a wing, installed vertically to create thrust to drive the plane forward.

Tail assembly: An aircraft’s tail is mainly used for stability, as well as creating lift in combination with the wings. It’s comprised of several parts.

Landing gear: Landing gear is located under the belly of the plane consisting of a wheel and strut to soften impact with the ground and may be retractable into the fuselage.

Explanation:

6 0
3 years ago
What does the enthalpy of reaction measure?
Gnesinka [82]
The heat released/absorbed by a reaction that occurs at constant pressure.

Hope this helped :)
7 0
3 years ago
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HOW DO THE STATES OF MATTER FIT INTO THE K-M THEORY? PLS NO LINKS
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Answer:Matter can exist in one of three main states: solid, liquid, or gas. Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around.

Explanation:

7 0
3 years ago
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Gaseous hydrogen and oxygen can be prepared in the laboratory from the decomposition of gaseous water. The equation for the reac
monitta

Answer:

  • 75.5 g O₂ (g) can be produced from 42.6 g of H₂O (g)

Explanation:

<u>1) Balanced chemical equation (given):</u>

  • 2H₂O(g) → 2H₂(g) + O₂(g)

<u>2) Mole ratios:</u>

  • 2 moles H₂O(g) : 2 moles H₂(g) : 2 moles O₂(g)

<u>3) Calculate the number of moles of reactant (H₂0):</u>

  • number of moles = mass in grams / molar mass

  • molar mass of water: 18.015 g/mol

  • mass in grams of water: 42.6 g

  • number of moles = 42.6 g / 18.05 g/mol = 2.36 moles H₂O

<u>4) Set a proportion using the mole ratio  O₂ to H₂O and the actual number of moles of H₂O:</u>

  • 2 moles O₂ / 2 moles H₂O = x / 2.36 moles H₂O

  • x = 2.36 moles O₂

<u>5) Convert 2.36 moles O₂ to grams:</u>

  • mass in grams = number of moles × molar mass

  • mass = 2.36 moles × 32.00 g/mol = 75.5 g O₂
4 0
3 years ago
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