Determine the molarity of a solution made by dissolving 13.8 g of sodium chloride in enough water to make 750.0 mL of solution. (The MM of NaCl is 58.44 g/mol)

Answers

Answer 1

Answer: Hope it helped you.

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A covalent bond forms a. when an element becomes a noble gas. b. when atoms share electrons. c. between metals and nonmetals. d. when electrons are transferred from one atom to another.

Which statement explains why a molecule of CH4 is nonpolar?(1) The bonds between the atoms in a CH4 molecule are polar.
(2) The bonds between the atoms in a CH4 molecule are ionic.
(3) The geometric shape of a CH4 molecule distributes the charges symmetrically.
(4) The geometric shape of a CH4 molecule distributes the charges asymmetrically.

Answers

The answer is the option (3) The geometric shape of a CH4 moleculedistributes the charges geometrically. the CH4 is a tetrahedral with theCarbon atom in the center and the four H atoms in the vertices of thetetrahedral. The C-H bond angles are all identical which makes themolecule perfectly symmetrical and so any dipolar moment will cancelmaking the molecule non polar.

The following statement explains why a molecule of $\text{CH}_4$ is nonpolar:

$\boxed{\left( 3 \right){\text{ The geometric shape of a C}}{{\text{H}}_4}{\text{ molecule distributes the charge symmetrically}}}$ .

Further explanation:

Covalent Bond

This type of bonding takes place when the bonded atoms mutually share electron pairs between them. It is also called the molecule bond. The chemical compounds formed as a result of this bond are called chemical compounds.

The polarity of any bond is primarily governed by two factors; electronegativity difference and symmetry. A bond is said to be polar if the bonded atoms have a considerable molecular bondelectronegativity difference between them. But if there is very small or no electronegativity difference between the bonded atoms, the resulting bond is nonpolar in nature.

Symmetry is another factor responsible for the polarity of the bond. The charge distribution is symmetrical in case symmetry is present in the molecule and as a result, the molecule is said to be nonpolar. But if there is asymmetry in the shape of the molecule, it will be polar in nature.

The electronegativity difference between carbon and hydrogen atoms in $\text{CH}_4$ molecule is very small or negligible so the bonds between the atoms in $\text{CH}_4$ are nonpolar in nature. But the hydrogen atoms are placed in symmetrical positions with respect to the central carbon atom, imparting symmetry to $\text{CH}_4$ molecule and therefore it is nonpolar (For structure, refer to the attached image).

Learn more:

Identification of ionic bonding: brainly.com/question/1603987
Chemical bonds in NaCl: brainly.com/question/5008811

Answer details:

Grade: High School

Chapter: Ionic and covalent compounds

Subject: Chemistry

Keywords: covalent bond, covalent compounds, CH4, carbon, hydrogen, symmetry, electronegativity difference, nonpolar.

Initially, a 55.0 liter compressible container, holding 2.4 moles of a gas, exerts a pressure of 760 millimeters of mercury at a temperature of 280 Kelvin. What is the pressure when the container is compressed to 43.0 liters, the moles of gas reduces to 1.8 moles, and the temperature changes to 36 degrees Celsius?93.7 mm Hg
492 mm Hg
740 mm Hg
805 mm Hg

Answers

Answer:

805 mmHg is the pressure when the container is compressed

Explanation:

Initial Volume of the gas, V = 55.0 L

Initial Moles of the gas, n = 2.4 mol

Initial Pressure of the gas ,P=760 mmHg

initial temperature of the gas, T = 280 K

Using an Ideal gas equation:

$PV=nRT$

$R=(PV)/(nT)$ ...(1)

Final Volume of the gas, V '= 43.0 L

Final Moles of the gas, n' = 1.8 mol

Final Pressure of the gas = p'

Final temperature of the gas, T' =36 °C = 309 K

Using an Ideal gas equation:

$R=(P'V')/(n'T')$ ..(2)

(1)=(2)

$(PV)/(nT)=(P'V')/(n'T')$

$(760 mmHg* 55.0 L)/(2.4 mol* 280 K)=(P'* 43.0 L)/(1.8 mol* 309 K)$

P' = 805 mmHg

805 mmHg is the pressure when the container is compressed.

You would have to use the ideal gas law for this:
PV=nRT
Pressure, Volume, n=moles, R gas constant, Temperature in Kelvin
P=nRT/V
(1.8mol)(62.36)(309K)/43.0L = 805mm Hg

Paintball is a popular recreational activity that uses a metal tank of compressed carbon dioxide or nitrogen to launch small capsules of paint. A typical tank has a volume of 508 cubic centimeters. A 340. gram sample of carbon dioxide is added to the tank before it is used for paintball. At 20.oC, this tank contains both CO2(g) and CO2(l). After a paintball game, the tank contains only CO2(g).Determine the total number of moles of CO2 added to the tank before it is used for paintball.

Answers

The total number of moles of CO₂ added to the tank before it is used for paintball is 7.73 moles.

What is a mole ?

A mole of a substance is that containing 6.022 * 10^23 molecules of that substance

A 340 gm sample of carbon dioxide

Molecular weight = 44

Moles added to the tank = mass/ molecular meight

Moles added to the tank = 340 /44

= 7.73 moles

The total number of moles of CO₂ added to the tank before it is used for paintball is 7.73 moles.

To know more about mole

brainly.com/question/26416088

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We know,
1000 cm³ = 1 L
1 cm³ = 1 / 1000 L
508 cm³ = (1 / 1000) * 508 L = 0.5080 L

So, 508 cm³ = 0.5080 L

Now,
We know,
22.4 L = 1 mole
1 L = 1 / 22.4 mole
0.5080 L = (1 / 22.4) * 0.5080L = 0.0227 moles

So, 0.0277 moles moles of $CO_2$ are added to the tank before it is used for paintball.

What 2 pieces of equipment will you use to separate the salt from the water?

Answers

Separate Salt and Water Using Distillation

If you want to collect the water, you can use distillation. This works because salt has a much higher boiling point than water. One way to separate salt and water at home is to boil the salt water in a pot with a lid.

hope this helps!!

Final answer:

To separate salt from water, you can use evaporation or filtration.

Explanation:

To separate the salt from the water, you can use the processes of evaporation and filtration.

Evaporation: You can heat the saltwater solution to boil off the water and leave behind the salt as solid crystals. The water evaporates and can be collected as a vapor if desired.
Filtration: Alternatively, you can use a filter to separate the solid salt particles from the liquid water. The saltwater solution is poured through the filter, which traps the salt while allowing the water to pass through.

Learn more about salt separation here:

brainly.com/question/12827858

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What makes hydrogen peroxide a polar molecule?

Answers

C. polar bonds and asymmetrical structure
If the molecule contains polar bonds but it has a symmetrical structure, the polar bonds will cancel each other out so the overall molecule will be non-polar.
On the other hand, if the molecule contains polar bonds but has an asymmetrical structure, then the polar bonds won't cancel each other out, so the overall molecule ends up being polar.

Given the reaction at 101.3 kPa and 298 K: hydrogen gas + iodine gas -> hydrogen iodide gas This reaction is classified as

Answers

Answer:

Endothermic, because heat is absorbed.

Explanation:

This is classified as a "Formation Reaction"

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