hey guys please help me

Answer:

n = 2 moles (1 sig-fig)

Explanation:

Using the Ideal Gas Law equation (PV = nRT), solve for n (= moles) and substitute data for ...

pressure = P(atm) = 100atm

volume =V(liters) = 50L

gas constant = R = 0.08206L·atm/mol·K

temperature = T(Kelvin) = °C + 273 = (35 + 273)K = 308K

PV = nRT => n = PV/RT = (100atm)(50L)/(0.08206L·atm/mol·K)(308K)

∴ n(moles) = 1.978moles ≅ 2 moles gas (1 sig-fig) per volume data (= 50L) that has only 1 sig-fig. (Rule => for multiplication & division computations round final answer to the measured data having the least number of sig-figs).

Moles are the ratio of the mass and the molar mass of the substance. In a 50.0 L cylinder, 2 moles of gas are present at 100 atm and 35 degrees celsius.

An ideal gas equation states the relationship between the moles of the substance, temperature, pressure, and volume. The ideal gas equation is given as,

\(\rm PV = nRT\)

Given,

The pressure of the gas (P) = 100.0 atm

Volume of the gas (V) = 50.0 L

Temperature (T) = 308 K

Gas constant (R) =  0.08206 L atm/mol K

Substituting values in equation moles (n) is calculated as:

\(\begin{aligned} \rm n&= \rm \dfrac{PV}{RT}\\\\&= \dfrac{100 \times 50}{0.08206 \times 308}\\\\&= 1.978\end{aligned}\)

Therefore, 1.978 or 2 moles of gas are present.

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Answer:

Explanation:

P = 2.35g

Cl= 0.539 g

% MASS = mass of  X/ mass of a compound

 % mass of P =   2.35 / (2.35+ 0.539) =  81.34%

  % mass of Cl =  0.539 /(2.35+ 0.539) =  18.66 %

Answer:

what the person above me said

Explanation:

Explanation:

1 M = 1 mol/L

4.36 mol NaCl ×(1L H20 / 4 mol NaCl) = 1.09 L H20

Answer:

1.09 L of water

Explanation:

4.36 mol NaCl ×(1L of H20 / 4 mol NaCl) = 1.09 L of water

Answer:

copper cathodes are normally referred to when talking about copper. Cathode is the purest form of copper and is the feedstock used to produce copper wire, cable, sheet, strip, tube, etc.

Explanation:

The structure of the 4-ethyl-2-methyl-3-propyl heptanoic acid is shown in the image attached

The arrangement and connectivity of the atoms within a molecule are referred to as the structure of an organic substance. Along with other elements including oxygen, nitrogen, sulfur, and halogens, organic molecules are largely made of carbon atoms bound to hydrogen atoms.

It is crucial to remember that organic compounds can exist in several isomeric forms, where the same chemical formula leads to various structural configurations. The connection of atoms or the spatial arrangement of atoms in three-dimensional space might vary between isomers.

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Answer:

5-20 mins

Explanation:

At constant temperature, the behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased because the (D) Average distance between molecules becomes greater.

An ideal gas is:

1) made up of molecules which are in constant random motion in straight lines.

2) all collisions are perfectly elastic, there is no loss of kinetic energy during the collision.

3) follows ideal gas law: p·V = n·R·T.

4) the gas particles have negligible volume.

At low temperatures, volume of the gas is not negligible.

Real gases may be expected to deviate from Charles's law at high pressures.

Real gases may be expected to deviate from Charles's law near the liquefaction temperature.

Missing options:

(A) Collisions with the walls of the container become less frequent

(B) Average molecular speed decreases

(C) Molecules have expanded

(D) Average distance between molecules becomes greater

(E) Average molecular kinetic energy decreases

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B. It represents the boundary between what is considered to be an  ionic or a covalent bond.

Electronegativity is the ability of atoms to attract electrons, especially in covalent bonds (sharing of electron pairs)

In a periodic system, electronegativity increases in a group, from bottom to top, and in a period from left to right.

From this difference in electronegativity, we can determine the ionic compound, polar or non-polar

Pauling determined the electronegativity scale (based on bond energies), between 0.7 - 4 (Fluorine has the highest number of electronegativities: 4)

Polar covalent compounds have a large electronegativity difference, while nonpolar compounds have a small electronegativity difference.

We can use the difference in electronegativity between the 2 bonded atoms to determine their polarity

Example

H = 2.1

O = 3.5

H₂O = 3.5-2.1 = 1.4 >> polar

= 3.5-3.5 = 0 >> non polar

It would require approximately 6 half-lives for the amount of a radioactive isotope to decrease to 3.13% of its original value.

To determine the number of half-lives required for a radioactive isotope to decrease to 3.13% of its original value, we can use the equation:

Final amount = Initial amount * (1/2\()^(number of half-lives)\)

We want the final amount to be 3.13% of the initial amount, which can be expressed as 0.0313 times the initial amount.

0.0313 = 1 * (1/2\()^(number of half-lives)\)

To solve for the number of half-lives, we can take the logarithm (base 1/2) of both sides:

log(0.0313) = log((1/2\()^(number of half-lives)\))

Using logarithmic properties, we can rewrite the equation as:

log(0.0313) = (number of half-lives) * log(1/2)

We can now solve for the number of half-lives:

number of half-lives = log(0.0313) / log(1/2)

Calculating this expression, we find:

number of half-lives ≈ 5.141

Since the number of half-lives must be a whole number, we round up to the nearest whole number.

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The wavenumber of the R-branch line with J = 2 is 50.16 cm^(-1). The Morse potential-energy function describes the potential energy (V) of a diatomic molecule with parameters De (dissociation energy), Re (equilibrium bond length), and a (width parameter).

For the first question:

The wavenumber (ν) of the R-branch line originating from the rotational state with J = 2 can be calculated using the formula:

ν = 2B(J+1)

where B is the rotational constant.

Given that the rotational constant (B) of H81Br is 8.360 cm^(-1), we can substitute the values into the formula:

ν = 2 * 8.360 * (2+1)

ν = 2 * 8.360 * 3

ν = 50.16 cm^(-1)

So, the wavenumber of the R-branch line originating from the rotational state with J = 2 is 50.16 cm^(-1).

For the second question:

The Morse potential-energy function is given by VR(R) = De {1 - e^(-a(R-Re))}^2

- De is the dissociation energy, which represents the energy required to dissociate the molecule completely into its constituent atoms.

- Re is the equilibrium bond length, which represents the internuclear separation at which the potential energy is minimized.

- a is the "width" parameter, which determines the steepness of the potential energy curve near the equilibrium position.

In the sketch of the function, the potential energy (V) is plotted against the internuclear separation (R). At R = Re, the potential energy is at its minimum (De). As R deviates from Re, the potential energy increases, and the curve becomes steeper as determined by the value of a.

De, Re, and a are important parameters in the Morse potential-energy function as they describe the shape and behavior of the potential energy curve for a diatomic molecule. They provide insights into the stability, bond strength, and bonding characteristics of the molecule.

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Answer:

Turning the lights off when they're not needed.

When the 1-chlorobutane is treated with sodium hydroxide, two products are formed are the correct option is C. 1 - butene F. 1 - butanol.

When 1-chlorobutane is treated with sodium hydroxide, The reaction is as follows :

1) The substitution reaction take place :

Cl - CH₂ - CH₂ - CH₂ - CH₃   +  NaOH  ---->  OH - CH₂ - CH₂ - CH₂ - CH₃

   1-chlorobutane             sodium hydroxide             1 - butanol              

2) The elimination reaction take place :

Cl - CH₂ - CH₂ - CH₂ - CH₃   +  NaOH  ---->  CH = CH - CH₂ - CH₃

1-chlorobutane             sodium hydroxide     1-butene

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Answer:

Nerve or muscle damage in the eye might cause double vision. Each eye creates its own image of the environment. The brain combines the representations from each eye and perceives them as one clear picture. Damage to the muscles that move the eyes or the nerves that control eye movement can create a double image.

Explanation:

The concentration contained in 14.5 grams of ammonium nitrate that is dissolved creating 250 milliliters is 0.72M.

The molarity or concentration of a substance refers to the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

Molarity can be calculated by dividing the number of moles in a substance by its volume as follows:

Concentration = no of moles ÷ volume

14.5 grams of ammonium nitrate with a molar mass of 80.043g/mol can be converted to moles to be 0.18 moles.

molarity = 0.18 mol ÷ 0.250L = 0.72M

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The approximate pH of the resulting mixture is 0.42

When 300 mL of 0.70 M HCl is mixed with 40 mL of 2.00 M NaOH, what will be the approximate pH of the resulting mixture?A neutralization reaction will occur when 300 mL of 0.70 M HCl is mixed with 40 mL of 2.00 M NaOH. HCl is an acid, and NaOH is a base, so when they react, they form water and a salt. The equation for this reaction is:HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)To solve the problem, we'll need to find out how many moles of each substance are present. This can be done by using the equation:n = c x VWhere n is the number of moles, c is the concentration in molarity, and V is the volume in liters.For HCl:n = 0.70 M x 0.300 L = 0.210 molesFor NaOH:n = 2.00 M x 0.040 L = 0.080 molesSince HCl and NaOH react in a 1:1 ratio, the limiting reactant in this reaction is NaOH, and it will react completely with 0.080 moles of HCl.

The remaining 0.130 moles of HCl will be in excess and will not react. Therefore, the number of moles of NaCl that are formed will be 0.080 moles.To find the pH of the resulting mixture, we need to know the concentration of H+ ions in solution. These can be found by using the equation:[H+] = n / Vwhere n is the number of moles of H+ ions, and V is the volume of the solution in liters. Since we have an excess of HCl in solution, the concentration of H+ ions will be equal to the concentration of the excess HCl.

This can be found by using the equation:[H+] = 0.130 moles / 0.340 L = 0.382 MTo find the pH of this solution, we can use the equation:pH = -log[H+]pH = -log[0.382]pH = 0.419Therefore, the approximate pH of the resulting mixture is 0.42 (rounded to two decimal places).Answer: pH = 0.42 (approximate)

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Answer:

b

Explanation: because i took the test and got a 100

Answer:

Chemical Family means a group of elements in the Periodic Table or, more commonly, compounds that share certain physical and chemical characteristics and have a common name.

A period in the periodic table is a row of chemical elements.

metalloid is an element (e.g. arsenic, antimony, or tin) whose properties are intermediate between those of metals and solid nonmetals or semiconductors.

Answer: A

Explanation: element 119, ununennium, is highly reactive and has high ionization energy, leave A as the only answer.

An atom is a particle of matter that uniquely defines a chemical

element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

the new volume of the gas is approximately 21.8 L when the pressure is raised to 39 atm and the temperature is increased to 398 K.

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:(P1V1)/T1 = (P2V2)/T2

Where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively. We can plug in the values given in the problem and solve for V2:

(P1V1)/T1 = (P2V2)/T2

(23 atm x 18 L) / 186 K = (39 atm x V2) / 398 K

Simplifying, we get:

V2 = (23 atm x 18 L x 398 K) / (186 K x 39 atm)

V2 = 21.8 L (rounded to one decimal place)

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Answer:

9.32×10⁻³

Explanation:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

. The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

How to add the number in scientific notation with same exponent.

7.21 ×10⁻³ + 2.11 ×10⁻³

exponent of both values are same thus we will take it common.

[7.21 + 2.11 ]×10⁻³

9.32×10⁻³

Answer:

1 molecule will equal 3 atoms :)

Explanation:

1 mole of water contains 6.02*10^23 molecules.

Each molecule of water contains 2 hydrogen atoms and 1 oxygen atom.

In the beaker there are 6.02*10^24 molecules of water.

=10*(6.02*10^23 molecules of water)

= 10 moles of water molecules.

1 molecule = 3 atoms

Considering the energy diagram for an exothermic reaction, the expectations for the reverse reaction is: (c) The reverse reaction would be endothermic and require a higher activation energy.

In an exothermic reaction, the products have lower energy than the reactants, resulting in the release of energy. The energy diagram for an exothermic reaction typically shows a downward slope from the reactants to the products, with the energy of the products being lower than the energy of the reactants.

When considering the reverse reaction of an exothermic reaction, it would involve the conversion of products back into reactants. Since the energy diagram for the forward reaction shows a decrease in energy from reactants to products, the reverse reaction would be expected to have an increase in energy from products to reactants.

In the reverse reaction, energy would need to be absorbed from the surroundings, making it an endothermic process. Additionally, the activation energy for the reverse reaction is expected to be higher because the reverse reaction has to overcome a higher energy barrier to convert the products back into the reactants.

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The molecular formula corresponds to a structural formula with carbon atoms having hybridizations of sp, sp², and sp³ is a) C₅H₆.

Hybridization is the concept that atomic orbitals fuse to shape newly hybridized orbitals, which in turn, impacts molecular geometry and bonding properties. Hybridization is likewise an growth of the valence bond theory. Hybridization is described because the intermixing of atomic orbitals with the equal strength tiers to offer the equal range of a brand new form of hybrid orbitals. This intermixing commonly consequences withinside the formation of hybrid orbitals having totally one of a kind energies, shapes, etc.

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Complete question-

Which molecular formula corresponds to a structural formula with carbon atoms having hybridizations of sp, sp², and sp³

a) C₅H₆

b) C₄H₆

c) C₃H₆

d) C₄H₄

e) C5H8

Answer:

The law of conservation of mass

Explanation:

A chemical equation is an expression of the net composition change associated with a chemical reaction. It shows how a certain amount of reactants yields a certain amount of products. Both of these amounts are measured in moles. Chemical equations often contain information about the state of the reactants: solid, liquid, gas, or aqueous. In addition, they always adhere to the law of conservation of mass, which holds that matter can change form, but cannot be created or destroyed.