Neutralization of 1 liter of a solution containing 1,4 g of
KOH requires 50 cm³of an acid solution. Calculate the
normality of the acid solution.
(Answer: 0,53 n.) how?

The bond length for NH3, NF3, and PF3 can be compared based on their molecular geometry and the strength of the chemical bonds between the atoms.

NH3 has a bond angle of 107 degrees and a bond length of 1.01 Angstroms. This is due to the presence of a lone pair of electrons on the Nitrogen atom which causes the bond angles to deviate from the ideal tetrahedral angles of 109.5 degrees.

NF3 has a bond angle of 107 degrees and a bond length of 1.1 Angstroms. This is due to the presence of a lone pair of electrons on the Nitrogen atom which causes the bond angles to deviate from the ideal tetrahedral angles of 109.5 degrees.

PF3 has a bond angle of about 101 degrees and a bond length of 1.48 Angstroms. This is due to the fact that the Fluorine atoms are larger than the Nitrogen atoms of NH3 and NF3, and the bond between Phosphorus and Fluorine is stronger and shorter than the bond between Nitrogen and Hydrogen or Nitrogen and Fluorine.

In summary, the bond length of NH3 and NF3 is shorter than that of PF3 due to the smaller size of Nitrogen atoms compared to Phosphorus and the presence of lone pairs on Nitrogen atoms. The bond between Nitrogen and Hydrogen or Nitrogen and Fluorine is weaker than the bond between Phosphorus and Fluorine.

After much experimentation, John discovers a law which says that the wavelengths of light absorbed by hydrogen gas fit into a pattern which he is able to express in a mathematical formula.

Niels has a hypothesis about why the wavelength of light absorbed by hydrogen has a certain value. Niels suggests the orbit of the electron in the hydrogen atom can only have certain radii, and when the electron "jumps" from one orbit to another, it emits light of an energy corresponding exactly to the difference in orbit energies.

In physics, wavelength is defined as the distance traveled by a wave in one period. Wavelength is represented by the Greek letter lamda (λ). That's why the wavelength formula is often called the Lambda formula.

How to calculate the lambda formula depends on the type of wave. Based on the direction of propagation, waves are divided into two types, namely transverse waves and longitudinal waves.

Transverse waves are waves whose direction of propagation is perpendicular to the direction of vibration. Examples include water waves, string waves, and light waves. Meanwhile, longitudinal waves have a direction of propagation that is parallel to the direction of vibration, for example sound waves.

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Answer:

The number of moles of HBr required to react with 2 g of propyne can be calculated by using the balanced chemical equation:

C3 H4 + 2HBr → C3 H6 Br2

The molar mass of propyne is (3 x 12 + 4 x 1) = 40 g/mol

So, 2 g of propyne is equal to 2/40 = 0.05 moles of propyne.

Since 2 moles of HBr are required to react with 1 mole of propyne, then 0.05 moles of propyne would require 0.05 x 2 = 0.1 moles of HBr.

Finally, to find the number of grams of HBr, we multiply the number of moles by its molar mass, which is (1 x 1 + 80 x 1) = 81 g/mol

So, 0.1 moles of HBr is equal to 0.1 x 81 = 8.1 g of HBr.

The Method of Mixtures Electrical Method is a method used to determine the electrical conductivity of a material.

The Electrical Method is a geophysical prospecting technique that uses electrical resistivity to map subsurface features, such as geological structures, fractures, and mineral deposits.

It involves measuring the amount of current that passes through a mixture of two materials under the application of a known voltage. The electrical conductivity of each material can then be determined by calculating the ratio of the current to the applied voltage. The electrical conductivity obtained from the Method of Mixtures Electrical Method can be used to characterize materials such as semiconductors and insulators.

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A thermodynamic system's property called enthalpy is the result of adding the internal energy of the system and the product of its pressure and volume.

The change in enthalpy for a chemical reaction, also known as the heat of reaction or delta H, is the amount of heat absorbed or released during the reaction at a constant pressure. To calculate the change in enthalpy for the chlorination of propane, you would need to know the enthalpies of formation for the reactants and products, and use the following equation:

ΔH = ΣΔHf (products) - ΣΔHf (reactants)

Where ΔHf is the enthalpy of formation for a given substance.

Without knowing the specific conditions and reactants, it's not possible to give a exact delta H value for the chlorination of propane. But it's an exothermic process, meaning that heat is released during the reaction. The magnitude of the heat released will depend on the specific reactants and conditions used.

Note that an overview was given as the information is incomplete.

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The new Vapor pressure of the dietheylether is  6.52 atm.

We have to note that the vapor pressure would have to do with the ease with which the substance can be converted from liquid to vapor. In this case we can see that we have about two different temperatures and we are trying to obtain the vapor pressure at each of the temperatures that have been given.

Using the formula;

ln(P2/P1) = -ΔHvap/R(1/T2 - 1/T1)

P2 = final pressure

P1 = initial pressure

ΔHvap = Enthalpy of vaporization

R = constant

T = Temperature

ln(P2/0.703) = -29.1 * 10^3/8.314(1/354 - 1/298)

ln(P2/0.703) =  -3651.3(0.0028 - 0.0034)

ln(P2/0.703) = 2.19

(P2/0.703)  = e^2.19

P2 = e^2.19 * 0.73

P2 = 6.52 atm

It has a vapor pressure of about  6.52 atm.

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The power sector is targeted for the application of hydrogen fuel cells.

This type of fuel produces electricity through the combination of hydrogen and oxygen atoms. The hydrogen reacts with oxygen across an electrochemical cell and produces electricity, water, and heat in a very small quantity.

Hydrogen-powered fuel cell electric vehicles doesn't have any carbon emission or greenhouse gases such as carbon dioxide etc which depletes the ozone layer and causes global warming.

It emit none of these harmful substance and only emits water and warm air which makes it a very clean fuel thereby causing a reduction in pollution and reducing the risk of respiratory diseases.

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The mass of water that can be obtained is 2.2 g of water.

We know that in the case that we have here, we are going to depend on the stoichiometry of the reaction and this is very important in the determination of the amount of the water that can be formed.

Now we can see that the reaction equation can be written from the fact that; [tex]2H_{2} (g) + O_{2} (g) ---- > 2H_{2} O(g)[/tex]. Then we can see that in this kind of chemical reaction we have to apply the stoichiometry.

Number of moles of the hydrogen = 14.8g/2 g/mol = 7.4 moles

Number of moles of oxygen = 34.8 g/32 g/mol = 1.1 moles

Given that 2 moles of hydrogen reacts with 1 mole of oxygen

7.4 moles of hydrogen reacts with 7.4 * 1/2

= 3.7 moles

Hence oxygen is the limiting reactant.

1 mole of oxygen produces 2 moles of water

1.1 moles of oxygen would produce 1.1 * 2/1

= 2.2 moles of water

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Answer: 2:3

Explanation: The question is phrased annoyingly. NH3 to H2 means we need to keep our numbers correct.

2NH3 -> 2 mol of NH3.

3H2 -> 3 mol H2.

NH3/H2 = NH3 to H2.

2:3.

2 mol NH3

----------------

3 mol H2.

2:3, not 3:2.

1. The mass of8.12 × 10²⁴ atoms of Co is 4.77 × 10^25 g.

2. There are 2.24 x 10²² atoms of carbon in 4.08g of aspirin.

To calculate the mass of 8.12 × 10²⁴ atoms of Co in grams, we need to know the atomic mass of cobalt (Co) in grams per mole. According to the periodic table, the atomic mass of Co is 58.93 g/mol.

We can calculate the mass of 8.12 × 10²⁴ atoms of Co by using the formula:

mass = (number of atoms) x (atomic mass)

mass = (8.12 × 10²⁴ atoms) x (58.93 g/mol)

mass = 4.77 × 10²⁵ g

So, the mass of 8.12 × 10²⁴ atoms of Co is 4.77 × 10²⁵ g.

Aspirin, also known as acetylsalicylic acid, has the chemical formula C9H8O4. To find out how many carbon atoms there are in 4.08g of aspirin, we can use the formula:

(Mass of aspirin) / (molar mass of aspirin) x (number of moles of C in aspirin)

We know the mass of aspirin is 4.08g and we can look up the molar mass of aspirin, which is 180.159 g/mol. To find the number of moles of C in aspirin, we can count the number of C atoms in the formula of aspirin which is 9 atoms, and then multiply that number by Avogadro's number, which is 6.022 x 10^23 atoms/mol.

So the number of carbon atoms in 4.08g of aspirin is:

4.08g / 180.159 g/mol * (9 atoms × 6.022 x 10²³ atoms/mol) = 2.24 x 10²² atoms

So there are 2.24 x 10²² atoms of carbon in 4.08g of aspirin.

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Answer:

C

Explanation:

because its the answer

Answer:

acids

Explanation:

acids because if the rain comes from cloud is acid it can be weathered or if the water is slightly acidic

Answer:

3.6999 x 10^2 l.

Explanation:

To find the volume of air with a mass of 1 lb, we can use the density formula:

Density = Mass divided by Volume

Rearranging the formula to solve for volume:

Mass / Density = Volume

Given that the density of air is 0.001226 g/ml, and we want to find the volume of 1 lb of air, we can substitute the following values into the equation:

(1 pound) / (0.001226 g/ml)

To convert pounds to grams, 1 pound equals 453.59 grams.

Volume = 453.59 g/0.001226 g/ml = 369,988.6 ml

Now we can convert from milliliters to liters. 1 liter equals 1,000 milliliters.

Volume = 369.99 l/1000 = 369,988.6 ml

To express it in scientific notation, you can use a factor of 10 to represent the decimal place. You move the decimal point of the number to the left or right until you have only one non-zero digit to the left of the decimal point.

369.99 l = 3.6999 x 10^2 l

So the volume of 1 lb of air is 3.6999 x 10^2 l.

Answer: a) ions and b) ions

Explanation:

If a certain ore is 21.3% nickel by mass. The number of kilograms of this ore would you need to dig up to have 20.0 g of nickel is: 93.897 kg.

Using this formula to determine the  mass of ore

Mass of ore = Mass of nickel / Percentage of nickel by mass

Convert the percentage to decimal form by dividing it by 100

0.213 = 21.3%.

So,

Mass of ore = (20.0 g) / (0.213)

Mass of ore = 93.897 kg

Therefore the  mass of ore is 93.897 kg.

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Answer:7.3

Explanation:

6) The constant is the amount of beverage in each sample. Option C

7) Greater amount of carbon dioxide dissolve at lower temperatures

8) It shows that the hypothesis should be thrown away. Option D

9) The independent variable is the temperature. Option B

When we talk about an experiment, then we would have to look at the interplay of one or more variables. It is common that when we are doing an experiment, the dependent variable would have to interface with the independent variable.

We can see that in the experiment, we are trying to find out the impact of the temperature on the mass of the carbon dioxide.

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According to the question, Equivalent volume of any gas at STP is 22.4 litre. So, Equivalent volume of hydrogen, will be 22.4 litre. ​Equivalent wt. of metal= 0.025gm

Hydrogen may be utilized to heat our dwellings and places of business in addition to powering vehicles and producing electricity. To reach net zero, it will be crucial to reduce our carbon emissions significantly.

The majority of stars and the sun include it, and the planetary Jupiter is primarily made of it. Less than consistent with similar per million per volume is all that is found when it is a gas present in the air.

​Equivalent wt. of metal/Weight of metal =moles of  [tex]H_{2}[/tex] ×valency factor

​Equivalent wt. of metal/ 1.017 g = (0.28 L/22.4 L) ×2

​Equivalent wt. of metal= 0.025gm

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Answer:

Explanation:

An anion is a negatively charged ion, meaning it has gained one or more electrons. A cation is a positively charged ion, meaning it has lost one or more electrons. The charge of an ion can be determined by its atomic number, the number of protons it contains, and the number of electrons it contains. An anion will have more electrons than protons and a cation will have more protons than electrons. An anion will be attracted to positive charges, while a cation will be attracted to negative charges. Anions and cations can also be compared based on their size and shape. Anions are typically larger than cations, and they often have a spherical shape. Cations, on the other hand, are typically smaller and have a more angular shape.

To neutralize a solution containing 0.32 g of NaOH in 40 cm3 requires 26.66 cm3 of 0,3 S. a. acid solution.

The quantity of moles per solution liter is how it is defined. It is utilized to calculate the number of grams that make up the solution's entire volume. It is utilized to calculate the mole ratio in the solution's overall volume. Normality is measured in units.

Calculation

How to calculate volume?

N1V1 = N2V2

normality = molarity x basicity

For sulfuric acid, the basicity is 2.

∴N1=0.3N

V1=?

Normality of NaOH is [0.32/(40×40)]×1000

N2=0.2×1=0.2N

V2=40ml

0.3 x V1 = 0.2 x 40

V1 = 26.6 cm³

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Answer:

djffffffffffffffffffffffffffffffffffffffffffffffffffffffffffgk

Explanation:

jdrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

a) phosphorus atom - This would have three concentric circles with the outermost circle having five electrons.

b) chlorine ion - This would have three concentric circles with the outermost circle having seven electrons.

c) beryllium atom - This would have two concentric circles with the outermost circle having two electrons

d) calcium ion - This would have four concentric circles with the outermost circle having two electrons.

We know that the Lewis dot diagram is the kind of representation that can be used to show the number of the electrons that we do have in an element. The number of atoms are shown in electrons that are in the orbits and the orbits are concentric circles that look very similar.

Recall that the orbits that we have in the atom are known to be arranged in energy levels and the energy levels of the atoms of the atoms of the elements play a key role in the Lewis dot structure of the elements that we know.

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The two mentioned gases have the same number of atoms as they are present at STP.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

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Answer:

Molecular formula = N2O4

Explanation:

Step 1: Assume that the mass of a compound is 100%

Step 2: Calculate the number of moles of each element

Step 3: Represent an empirical formula

Step 4: Divide the number of moles of each element by the least number of moles

Step 5: Write the empirical formula

Step 6: Calculate the empirical mass

Step 7: Represent a molecular formula

Step 8: Solve for n by dividing molecular mass by empirical mass

Step 9: Multiply the subscripts of the empirical formula by the value of n to obtain the molecular formula

Answer:0+npipi/4+2npi

Explanation:

The majority of metals are malleable, meaning they can be bent and moulded without breaking.

define moulding ?

architect a shaped outline, especially one used on cornices, etc.

a formed strip of wood, stone, or other material

a moulded item, a decorative recessed or relieved surface, a decorative plane or curved strip for embellishment or finishing

The majority of metals are malleable, meaning they can be bent and moulded without breaking. This is due to the fact that they are made up of layers of ions that can glide over one another when the metal is twisted, hammered, or pushed. Most metals are ductile because the ions slide over one other and may be drawn/pulled into wires, making them excellent for electric cables.

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Answer: 31.2 g

Explanation: Given,

2.40 x 10^23 molecules of SO3

number of moles (n) = given number of molecules / total number of molecules

n = 2.4 x10^23/ 6.023 x 10^23

n = 0.39 moles

mass  = molecular mass x number of moles(n)

mass in grams  = 80 (Molecular mass of SO3) x 0.39

mass in grams  = 31.2 g

Answer:

D

Explanation:

The percentage of red glass beads would be = 16.67%

Percentage is defined as the part of a portion of a value per 100 and it is represented by the symbol %.

The number of red colored glass beads = 25

The total number of glass beads = 150

The percentage of glass beads that are red colored glass would be;

= 25/150×100

= 2500/150

= 16.67%

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Net Ionic Equation: 2Ag+(aq) + Ca₂ +(aq) + 2Br⁻(aq) → 2AgBr(s)

A chemical equation for a process called a net ionic equation only includes the species that are involved in the reaction. The spectator ions, which pass through the process unaltered, are not listed.

In this question the steps for this process are as follows:

Step 1: Write out the molecular equation.

2AgNO₃ (aq) + CaBr₂ (aq) → Ca(NO₃)₂ (aq) + 2AgBr (s)

Step 2: Balance the equation.

2AgNO₃ (aq) + CaBr₂ (aq) → Ca(NO₃)₂ (aq) + 2AgBr (s)

Step 3: Write out the ionic equation.

2Ag+ (aq) + 2NO₃⁻ (aq) + Ca₂+ (aq) + 2Br ⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + 2AgBr (s)

Step 4: Simplify the equation by cancelling out the species that are on both sides of the equation.

2Ag+ (aq) + Ca₂+ (aq) + 2Br⁻ (aq) → 2AgBr (s)

Step 5: The net ionic equation is the final result.

Net Ionic Equation: 2Ag+ (aq) + Ca₂+ (aq) + 2Br ⁻ (aq) → 2AgBr (s)

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The thermochemical equation for this reaction by calculating its thermal effect is H₂S +CO₂ = CS₂ + water vapor.

Thermochemical equations are balanced chemical equations that contain all reactants and products' physical states as well as the energy change. The reaction is endothermic when energy is a reactant, but exothermic when energy is a product.

A thermochemical equation is a stoichiometric chemical equation with a balanced enthalpy change, H. A thermochemical equation in variable form would look like this: A + BC.

Therefore, the thermochemical reaction is H₂S +CO₂ = CS₂ + water vapor.

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