Which electron configuration shows an atom with 6 valence electrons?

Answer:

47.68 mL

Explanation:

In this case, we have a dilution problem. So, we have to start with the dilution equation:

\(C_1*V_1=C_2*V_2\)

We have to remember that in a dilution procedure we go from a higher concentration to a lower one. With this in mind, We have to identify the concentration values:

\(C_1~=~6.00~M\)

\(C_2~=~1.53~M\)

The higher concentration is C1 and the lower concentration is C2. Now, we can identify the volume values:

\(V_1~=~X\)

\(V_2~=~187~mL\)

The V2 value has "mL" units, so V1 would have "mL" units also. Now, we can include all the values into the equation and solve for "V1", so:

\(6.00~M*V_1=1.53~M*187~mL\)

\(V_1=\frac{1.53~M*187~mL}{6.00~M}=47.68~mL\)

So, we have to take 47.68 mL of the 6 M and add 139.31 mL of water (187-47.68) to obtain a solution with a final concentration of 1.53 M.

I hope it helps!

Answer:

a. Using the Ideal Gas Law, PV = nRT, we can rearrange it to get n = PV/RT. At STP, T = 273 K and P = 1 atm. The molar volume of any gas at STP is 22.4 L/mol. Therefore, for SO₂:

n = (1 atm)(67.2 L)/(0.0821 L·atm/mol·K)(273 K)

n = 2.60 mol

b. Again using the Ideal Gas Law, we get:

n = (1 atm)(0.880 L)/(0.0821 L·atm/mol·K)(273 K)

n = 0.0355 mol

c. Following the same procedure:

n = (1 atm)(1.00 x 10³ L)/(0.0821 L·atm/mol·K)(273 K)

n = 40.9 mol

Answer: UV Rays can't travel through glass, making it impossible to get a suntan because your body won't be able to respond if there is no UV getting to it.

Explanation: Glass absorbs and deflects a lot of UV light because the wavelengths aren't small enough to pass through and as a result, your body can't undergo its natural response of producing melanin, because the proteins activated by the UV damage won't be enacted.

Answer:

The glass protects you from UV rays.

Answer: 1. Oxygen is the the limiting reactant.

2. 7.52%

Explanation:

The balanced chemical equation is:

\(2H_2(g)+O_2(g)\rightarrow 2H_2O(g)\)  

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)    

\(\text{Moles of} H_2=\frac{30.0g}{2g/mol}=15.0moles\)

\(\text{Moles of} O_2=\frac{5.29g}{32g/mol}=0.165moles\)

According to stoichiometry :

1 mole of \(O_2\) require  = 2 moles of \(H_2\)

Thus 0.165 moles of \(O_2\) will require=\(\frac{2}{1}\times 0.165=0.331moles\)  of \(NH_3\)

Thus \(O_2\) is the limiting reagent as it limits the formation of product and \(H_2\) is the excess reagent.

2.  \(\text{Moles of} H_2=\frac{9.93g}{2g/mol}=4.96moles\)

\(\text{Moles of} H_2O=\frac{6.72g}{18g/mol}=0.373moles\)

As 2 moles of \(H_2\) give = 2 moles of \(H_2O\)

Thus 4.96 moles of \(H_2\) give =\(\frac{2}{2}\times 4.96=4.96moles\)  of \(H_2O\)

percentage yield = \(\frac{\text {actual yield}}{\text {theoretical yield}}=\frac{0.373}{4.96}\times 100=7.52\%\)

Thus the percent yield for the reaction is 7.52%

Any substance made of matter is by definition a chemical, which includes solids, liquids, and gases. Pure substances or mixtures of substances can both be found in chemicals. Water (H2O), for example, is a pure chemical because the same molecules and molecular combinations are present throughout its whole structure.

Any material with a known composition is a chemical. Some chemicals, like water, are found in nature, meaning they always consist of the same "stuff." Other chemicals, including chlorine, are produced (used for bleaching fabrics or in swimming pools).

A chemical compound is a material that contains a specific combination of atoms or ions. Chemical compounds are made up of two or more elements coming together through a chemical process. While all substances are compounds, not all substances are compounds.

On its list of substances covered by the Toxic Substances Control Act, the EPA has more than 85,000 chemicals listed.

Not all chemicals are detrimental to the economy.

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Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles H₂O₂ is 62.9 grams.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound H₂O₂ is calculated as:

H₂O₂= 2× 1 g/mole + 2× 16 g/mole

Solving:

H₂O₂= 34 g/mole

You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?

mass= (1.85 moles× 34 grams)÷ 1 mole

mass= 62.9 grams

Finally, the mass of 1.85 moles H₂O₂ is 62.9 grams.

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They give us the boiling point of a substance and two temperatures, one initial and one final.

The first temperature, 25°C, is below the boiling point, 145°C, which means that the substance is initially in a liquid state.

The final temperature is a temperature above the boiling point, 155°C. This means that the substance will be in a gaseous state.

So what we can predict is that the substance initially in liquid state changes to a gaseous state due to the increase in temperature.

Answer:

30.07 g in 1 mole C2H6.

Explanation:

Answer:

I thinnk neutron bcoz its is a charge less particle and it's contains less atom so it has less mass

Answer:

1.46

Explanation:

I hope that was useful

Answer:

1.4593 = 1.46

Explanation:

9 is more than 5 .so it will be added to 5 as +1

Answer:

Explanation:according to question:

. Nacl (aq) + AgNO3 (aq) --> AgCl

(s) + NaNO3 (aq).balanced.

The mass of hydrogen needed to produce 51.0 grams of ammonia is  ≈ 9.07 grams.

To determine the mass of hydrogen required to produce 51.0 grams of ammonia (NH3) using the Haber process, we need to calculate the stoichiometric ratio between hydrogen and ammonia.

From the balanced chemical equation:

3 H₂(g) + N₂(g) → 2 NH₃(g)

We can see that for every 3 moles of hydrogen (H₂), we obtain 2 moles of ammonia (NH₃).

First, we need to convert the given mass of ammonia (51.0 grams) to moles. The molar mass of NH₃ is 17.03 g/mol.

Number of moles of NH₃ = Mass / Molar mass

                     = 51.0 g / 17.03 g/mol

                     ≈ 2.995 moles

Next, using the stoichiometric ratio, we can calculate the moles of hydrogen required.

Moles of H₂ = (Moles of NH₃ × Coefficient of H₂) / Coefficient of NH₃

           = (2.995 moles × 3) / 2

           ≈ 4.493 moles

Finally, we can convert the moles of hydrogen to mass using the molar mass of hydrogen (2.02 g/mol).

Mass of H₂ = Moles × Molar mass

          = 4.493 moles × 2.02 g/mol

          ≈ 9.07 grams

Therefore, approximately 9.07 grams of hydrogen is needed to produce 51.0 grams of ammonia in the Haber process.

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In terms of solute moles, molarity and molality both represent concentration. The volume of the solution, not the volume of the solvent, must be used to determine.

While a solution's molarity is determined by the moles of solute divided by the volume of the solution in litres, a solution's molality is determined by the moles of solute divided by the mass of the solvent in kilogrammes.

Molarity is the number of moles of solute dissolved in one litre of solution, whereas moles of solute per thousand grammes of solvent is known as molality. Molality is not temperature-dependent, however, molarity changes when the temperature changes because the volume does.

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The specific heat in, J /g °C of copper is 0.386J/g°C

HOW TO CALCULATE SPECIFIC HEAT CAPACITY OF A SUBSTANCE:

Q = m × c × ∆T

Where;

Q = quantity of heat absorbed or released (J)

m = mass of substance (g)

∆T = change in temperature (°C)

c = specific heat capacity (J/g°C)

For a colorimeter, the following equation applies:

m.c.∆T (water) = - m.c.∆T (metal)

m = 50g

c = 4.184 J/g°C

∆T = 29.2 - 26°C = 3.2°C

m = 70g

c = ?

∆T = 29.2 - 54°C = -24.8°C

m.c.∆T (water) = - m.c.∆T (metal)

50 × 4.184 × 3.2 = -(70 × c × -24.8)

669.44 = 1736c

c = 669.44 ÷ 1736

c = 0.386J/g°C

Therefore, the specific heat in, J /g °C of copper is 0.386J/g°C

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The A state can participate in a variety of exothermic chemical processes due to its three-second radiative lifespan. All thermal energy must be lost within 3 seconds by radiative diffusion.

The change in energy flux in the atmosphere brought on by anthropogenic or natural climate change, as expressed in watts per metre, is known as radiative forcing (also known as climate forcing). A process for which the overall standard enthalpy change (H) is negative is referred to as an exothermic reaction in thermochemistry. Typically, exothermic reactions produce heat. Exergonic reaction, which the IUPAC defines as a reaction for which the overall standard Gibbs energy change is negative, is frequently mistaken with the term. Most of the time, an intensely exothermic reaction will also be exergonic.

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Answer:

2.9 psi

Explanation:

Pressure (mmHg) = 150 mmHg

Pressure (psi) =?

The pressure in pound per square inch (psi) can be obtained as follow:

51.715 mmHg = 1 psi

Therefore,

150 mmHg = 150 mmHg × 1 psi / 51.715 mmHg

150 mmHg = 2.9 psi

Thus, pressure in pound per square inch (psi) is 2.9 psi.

Answer:

D

Explanation:

i did it before

Answer:

give me branlist it is 120nh

Answer:

Car B has more inertia than Car A

Explanation:

Given that,

Mass of car A = 1500 kg

Mass of car B = 2000 kg

Inertia is directly proportional to the mass of an object. Inertia is the measure of the mass of an object.

In this case, the mass of car B is more than that of car A, it means the inertia of car B is more than that of car A.

Hence, the correct option is (c) "Car B has more inertia than Car A".

The frequency of this radiation of a quantum of energy 4.14 *10-14 J is calculated to be 2.58 *10-15 Hz.

The Photoelectric Effect occurs when electrons are released from a metal surface when light strikes it. It was once thought that the greater the intensity of incoming light, the greater its energy, independent of hue. The light was viewed and treated as a wave, however, the wave phenomenon could not explain light's photoelectric actions.

The Quantum, according to Max Planck, is the smallest unit of energy that is released or absorbed in the form of electromagnetic radiation. The energy released or absorbed is proportional to the frequency of the radiation. It may be expressed mathematically as:

E= hc/λ

or

E= hf        ( because, f = c/λ)

where,

E= Energy of the particle

h= Planck's constant

c= speed of light

λ= wavelength of the particle

f = frequency of the radiation

Thus, E= hf

Given,

E = 4,14*10-14J

E= 1.71017356 * 10^20 eV

h= 6.626 *10-34 m2Kg/s

E=hf

f= E/h

f= (1.71017356 * 10^20 eV) / (6.626 *10-34 m2Kg/s)

f= C

Thus, the frequency of this radiation is 6.626 *10-34 m2Kg/s.

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As mentioned, 684 g of lead would've been needed to produce 119 g of water.

The mass of a material or substance tells us how much matter makes up that thing or substance. Despite the possibility of using grams to describe strength training, the kilowatt (kg) is the primary SI mass measurement (g). To measure mass, you might employ a balance. The amount of material an item contains is significantly influenced by its mass. A picture's gravity may be estimated based on its density. Along with its gravity, an element's location is crucial. This means that weight is still used to represent force.

(119 g H₂O) / (18.01532 g H₂O/mol) x (1 mol Pb / 2 mol H₂O) x (207.21 g Pb/mol) = 684 g Pb

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The weight of the beaker is 65g.

Comparing the weights:

Finally, the sum of the mass of water and the mass of salt causes the total weight to increase, so the weight of the aquarium changes.

According to the question the reaction enthalpy is thus 10610 J / 0.278 moles = 38.3 kJ/mol.

Enthalpy is a thermodynamic property of a system that measures the total energy content of a system. It is a state function that is expressed in terms of internal energy, pressure, and volume of a system. Enthalpy represents the amount of energy that is associated with a chemical reaction or physical change.

The reaction is exothermic, meaning that heat is released during the reaction. The amount of heat released can be calculated with the equation q = mcΔT, where q is the heat released, m is the mass of the solution, c is the specific heat capacity of the solution, and ΔT is the change in temperature of the solution. Using the given data, the amount of heat released by the reaction can be calculated as q = (250 g)(4.184 J/g-K)(11.1 K) = 10610 J. The enthalpy change for the reaction can then be calculated by dividing the heat released by the number of moles of NaOH, which is 11.1 g / 40.00 g/mol = 0.278 moles. The reaction enthalpy is thus 10610 J / 0.278 moles = 38.3 kJ/mol.

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The general gas equation, commonly referred to as the ideal gas law, represents the state of a fictitious ideal gas through an equation. Here the mass of helium gas required to pressurize 86 L tank to 201 atm is 2561.8 g.

According to the ideal gas law, the sum of the absolute temperature of the gas and the universal gas constant is equal to the product of the pressure and volume of one gram of an ideal gas.

The ideal gas equation is given as:

PV = nRT

n = PV / RT

56°C = 329 K

n = 201 × 86 / 0.08206 × 329 = 640.45 mol

Molar mass of 'He' = 4.00 g / mol

Mass =  640.45 × 4.00 = 2561.8 g

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Answer:

   A + B = AB is an example of a synthesis reaction

Explanation:

Answer: 8.979

Explanation:

At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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The heat absorbed by the solution is 386.9 cal.

First, we need to calculate the heat absorbed by the solution using the formula:

q = m × c × ΔT

Where q is the heat absorbed, m is the mass of the solution, c is the specific heat constant, and ΔT is the change in temperature.

m = 45.4 g

c = 1 cal/g oC

ΔT = 31.5 oC - 23.0 oC = 8.5 oC

Substituting the values in the formula, we get:

q = 45.4 g × 1 cal/g oC × 8.5 oC

q = 386.9 cal

Therefore, the heat absorbed by the solution is 386.9 cal.

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(a) The hydrogen ion concentration in the solution is [H+] = 1.14x10^-3 M. (b) 0.57%. (c) The ratio of the concentration of propanoate ion to that of propanoic acid in the buffer solution is 2.68.

(a) The balanced equation for the ionization of propanoic acid is:

C2H5COOH + H2O ⇌ C2H5COO- + H3O+

The equilibrium expression for this reaction is:

Ka = [C2H5COO-][H3O+] / [C2H5COOH]

At equilibrium, the concentration of propanoic acid that has ionized to form propanoate ion and hydronium ion is equal to the concentration of propanoic acid that has not ionized, so we can assume that [C2H5COO-] ≈ [H3O+]. Let x be the concentration of hydronium ion in the solution. Then the equilibrium expression becomes:

Ka = x^2 / (0.20 - x)

Solving for x, we get:

x = sqrt(Ka * (0.20 - x)) = sqrt(1.3x10^-5 * 0.20) = 1.14x10^-3 M

Therefore, the hydrogen ion concentration in the solution is [H+] = 1.14x10^-3 M.

(b) The percentage of propanoic acid molecules that are ionized in the solution is given by:

% ionization = [H3O+] / [C2H5COOH] x 100%

% ionization = (1.14x10^-3 / 0.20) x 100% = 0.57%

(c) The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation:

pH = pKa + log([C2H5COO-] / [C2H5COOH])

At pH 5.20, the hydronium ion concentration is 10^-5.20

= 6.31x10^-6 M.

Using the equilibrium expression for propanoic acid and the fact that [C2H5COO-] + [C2H5COOH] = total buffer concentration,

we can solve for the ratio of the concentrations of propanoate ion to propanoic acid:

Ka = [C2H5COO-][H3O+] / [C2H5COOH]

[C2H5COO-] = Ka[C2H5COOH] / [H3O+]

[C2H5COO-] = (1.3x10^-5)([C2H5COOH]) / (6.31x10^-6)

[C2H5COO-] / [C2H5COOH]

= 2.68

Therefore, the ratio of the concentration of propanoate ion to that of propanoic acid in the buffer solution is 2.68.

(d) When solid NaOH is added to the buffer solution, it reacts with the propanoic acid to form propanoate ion and water:

C2H5COOH + NaOH → C2H5COO- + H2O + Na+

The number of moles of propanoic acid that react with NaOH is equal to the number of moles of NaOH that were added. The new concentration of propanoic acid is:

0.35 M - (0.0040 mol / 0.100 L) = 0.346 M

The new concentration of propanoate ion is:

0.50 M + (0.0040 mol / 0.100 L) = 0.54 M

The new concentration of hydronium ion can be calculated using the equilibrium expression.

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Answer:

C. Physical weathering.

Answer: C. Physical weathering.

Explanation: