determine the ph of a 0.188 m nh3 solution at 25°c. the kb of nh3 is 1.76 × 10-5.
Answer A. 5.480 B. 2.740 C. 8.520 D. 11.260 E. 12.656

Answer: infinitely many solutions

Explanation: since this equation is the same on both sides, any value that is plugged in for "u" will equal the same amount on both sides.

example) -8 + 3(1) = 3(1) - 8

-8 +3 = 3 + -8

-5 = -5

The concentration of the chemist's working solution, according to the statement, is 0.13 mol/L.

The quantity of a material, like salt, that is present in a specific volume of material or liquid, like blood, according to science. When there is less water present, the material becomes more concentrated. You can determine how much molecule has been digested in the solvent by looking at the level of the solution's concentration. For instance, the concentration may be stated as 1 teaspoon of salt per 2 cups of water if you add 1 teaspoon to 2 cups of water.

Stock solution concentration, C1 = 2.43 mol/L

Stock solution volume, V1 = 120 mL = 0.120 L

Working solution quantity: V2 = 480 mL = 0.480 L

We have C1V1=C2V2 for the working solution concentration, C2.

Regarding arranging,

C2 = C1V1/V2

= 2.43mol/L*0.120L/0.480L

= 0.13mol/L

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5 moles of water will be obtained from the reaction on complete consumption of one gas.

The balanced equation for the reaction between hydrogen and oxygen to form water is:

2H2 + O2 -> 2H2O

From the given information, we know that 10 moles of hydrogen are allowed to react with 6 moles of oxygen.

In order to determine the amount of water that will be formed, we can use the stoichiometry of the reaction to calculate the number of moles of water that will be produced.

Since the coefficients in the balanced equation are the same for hydrogen and oxygen, we can use the number of moles of either gas to calculate the number of moles of water that will be formed.

In this case, we have 10 moles of hydrogen and 6 moles of oxygen.

From the balanced equation, 2 moles of H2 react with 1 mole of O2 to form 2 moles of H2O. So, 10 moles of H2 / 2 moles H2 per mole H2O = 5 moles of H2O will be formed.

So, 5 moles of water will be obtained from the reaction on complete consumption of one gas.

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In order for 0.10 mol of crystalline magnesium hydroxide to completely react, 100 mL volume, in milliliter, of 2.00 mol hydrobromic acidity is needed.

Magnesium hydroxide is just a short-term medication for adults and children who experience sporadic constipation. Saline laxatives are a group of drugs that include magnesium.

Magnesium hydroxide increases gastrointestinal water and lowers stomach acid, which may promote bowel movements. A reliever used to address sporadic nausea is potassium hydroxide. Additionally employed as a neutral to relieve stomach pain, vomiting, and discomfort is potassium hydroxide.

2.00 mol H × = 100 mL

= 1.00 L

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Answer:

Explanation:

The height of the wave is called the amplitude.

so the correct answer is B.

The kinetic  energy of a gas's particles is inversely related to its temperature. As the gas warms, the particles must travel more quickly because their mass is constant.

A particle or an item that is in motion has a sort of energy called kinetic energy. An item accumulates kinetic energy when work, which involves the transferring of energy, is accomplished on it by exerting a net force.

The relationship between kinetic energy and an object's mass and square of all its velocity is direct: K.E. = half m v2. if the mass is measured in kilograms, and the speed is measured in meters per second.

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If the atomic radius of gold is 0.144 nm, the volume of its unit cell in cubic meters is the 6.76 × 10⁻²⁹ m³.

Given that :

Atomic radius = 0.144 nm

The crystal of the gold if FCC.

The volume expression is given below :

The edge length is  , a = 2√2r

V = 16√2r³

r = 0.144 nm = 0.144 × 10⁻⁹ m

V = 16√ 2 × 0.144 × 10⁻⁹

V = 6.76 × 10⁻²⁹ m³.

Thus, The volume is the unit cell with the atomic radius of the gold ia 0.144 nm is  6.76 × 10⁻²⁹ m³.

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the equilibrium constant (Kc) for the reaction at 25 ∘C is e^(-5764.68/(8.314*298.15))

The equilibrium constant (Kc) for a reaction can be calculated using the standard Gibbs free energy of the reaction (ΔG°) at a given temperature. The Gibbs free energy for a reaction can be calculated using the standard electrode potentials (Eo) of the reduction

half-reactions involved in the reaction as: ΔG° = -nFΔE°

For the reaction : MnO2(s) + 4H+(aq) + Cu(s) → Mn2+(aq) + 2H2O(l) + Cu2+(aq)

The standard electrode potentials for the reduction half-reactions are:

MnO2(s) + 4H+(aq) + 2e- → Mn2+(aq) + 2H2O(l) Eo = 1.21 V

Cu2+(aq) + 2e- → Cu(s) Eo = 0.16 V

The change in standard electrode potential for the reaction is the sum of the electrode potentials for the half-reactions is :

ΔE° = Eo(Mn2+/MnO2) + Eo(Cu/Cu2+) = 1.21 V + 0.16 V = 1.37 VThe standard Gibbs free energy for the reaction is

ΔG° = -nFΔE° = -4 * 96485 * 1.37 = -5764.68 J/mol

The equilibrium constant (Kc) for the reaction at 25 ∘C can be calculated using Kc = e^(-ΔG°/RT) where R is the gas constant (8.314 J/mol·K) and T is the temperature in Kelvin (298.15 K).So the equilibrium constant (Kc) for the reaction at 25 ∘C is e^(-5764.68/(8.314*298.15))

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The free energy change for the reaction at 35 ∘C is -1157.45 KJ

Gibbs free energy also termed as the Gibbs energy as well as free enthalpy, or Gibbs function is a quantity which is also used to measure the maximum amount of work done in thermodynamic system when the pressure and temperature are kept constant.

Formula of Gibb's free energy is as follows:

ΔG = ΔH -TΔS

ΔH =1269.8 kJ

ΔS= -364.6 J/K

T = 35ºC = 308.15

ΔS = x 0.001 = 0.3646

ΔG = 1269.8 kJ -(308.15x-0.3646)

ΔG = -1157.45 kJ

Therefore, it is a spontaneous process.

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According to the claim, one serving of alcohol (14–17 grams) has around 100 calories.

Energy is measured in calories. Calories in nutrition relate to the energy that humans obtain from the food and liquids they consume as well as the energy they expend when engaging in physical activity. On every food package, the nutritional information includes a list of calories. Many diet plans for losing weight include cutting calories.

Calories are the units of energy used by your body during food digestion and absorption. A meal might provide your body extra energy if it has more calories. Your body stores excess calories from body fat when it eat more than you need.

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According to the provided statement, the mystery gas has a molar mass of 118.1 g/mol.

Numerous processes and products are refined and made using hydrogen chloride, including scrubbing, pickling, depositing metals, curing leather, and sanitising. Burning various plastics can result in the formation of hydrogen chloride. In the presence of water, it produces hydrochloric acid.

Graham's Rule of Emfluence

According to Graham's law of effusion, a gas's effusion rate is inversely related to the square root of its particle mass. You may write this formula as follows:

[tex]\frac{\text { Rate }_1}{\text { Rate }_2}=\sqrt{\frac{\mathrm{M}_2}{\mathrm{M}_1}}[/tex]

Rate1 is the first gas's effusion rate.

The second gas's effusion rate is represented by Rate2.

The average concentration of gas is M1, The mole ratio of gas is 1 M2. 2.

Gases like hydrogen chloride (HCI) diffuse 1.8 times more quickly than unidentified gases.

The molar volume of halogens (HCI) is known to be 36.46 g/mol.

Unknown gas has a molar mass of =?

In the formula, let's enter the following values:

[tex]\frac{\text { Rate }_{\mathrm{H}_2}}{\text { Rate }_{\text {unknown }}}=\sqrt{\frac{\mathrm{M}_{\text {unknown }}}{\mathrm{M}_{\mathrm{H}_2}}} 1.8=\sqrt{\frac{\mathrm{M}_{\text {unknown }}}{36.46}}(1.8)^2=\frac{\mathrm{M}_{\text {unknown }}}{36.46} \mathrm{M}_{\text {unknown }}=36.46 \times(1.8)^2 \mathrm{M}_{\text {unknown }}=118.1304 \mathbf{M}_{\text {unknown }}=\mathbf{1 1 8 . 1}[/tex]

The unknown gas has a molar mass of 118.1 g/mol.

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When HNO2 is added, concentration of HNO2 rises and the equilibrium is shifted to the left, where it favours NO2 ions and depletes OH ions.

It is a static or dynamic state of equilibrium between two opposing forces or actions. The extent of a reaction, or the level of the vanishing of the reactants, can be predicted using the equilibrium constant (Kc). A general sense of the relative amounts of the reactants and products can be obtained from the equilibrium constant's magnitude.

The equilibrium's equation is:

NO2- (aq.) + H2O (l) ⇌ HNO2 (aq.) + OH− (aq.)

Le Chatelier's Principle will be applied to ascertain how the addition of the specified chemicals would affect the equilibrium mixture.

The equilibrium is shifted to the left by the addition of HNO2, which raises the concentration of HNO2.

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Depending on the difference in electronegativity between the participating atoms, covalent bonds can either be polar or nonpolar.

The correct option C

The electronegativity of an atom describes its propensity to attract protons or electron density in that direction. It regulates the shared electron distribution between a number of atoms in a bond. The stronger the attraction of the electrons in an atom's bonds, the more electronegativity it possesses.

The strength with which an element draws the shared electrons depends on the value of its electronegativity.

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(a) The number of grams in 1 amu of material is 1.66 * 10^-24 grams. (b) The number of atoms in pound-mole of a substance is calculated as 2.73 *10^26 atoms.

Avogadro constant is the proportionality factor that relates the number of constituent particles in sample with the amount of substance in that sample.

(a): We known that : 1gram = 6.022 * 10^23 amu

1 amu = 1 amu / 6.022 * 10^23 *1 gm=  1.66 * 10^-24 grams

Hence, the number of grams in 1 amu is  1.66 * 10^-24 grams

(b) : We know that the value of gram-mole is same in pound-mole.

As, Number of atoms = Pound-mole * Avogadro's number

And 1 Pound-mole = 453.6 gram-mol

As, Avogadro's number = 6.022 * 10^23

So, number of atoms = 1 pound - mol * 6.022 * 10^23 atoms/g mol

Number of atoms = 453.6 gram. mol * 6.022 * 10^23 atoms/g mol

Now, number of atoms = 2.73 *10^26 atoms

Thus, number of atoms in a pound-mole of substance is  2.73 *10^26 atoms.

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882 kJ/mol of energy will be needed to break the necessary bonds in the formation of two moles of water.

Energy is described as the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light.

The bond energy of H-H is 436 kJ/mol

The bond energy of O=O is 495 kJ/mol

The bond energy of H-O is 463 kJ/mol

In order to calculate the total energy needed to break the bonds in the reactants, we add up the bond energy of each bond broken.

For 2 moles of H2 we need 22436 = 1744 kJ/mol

For O2 we need 2*495 = 990 kJ/mol

In total, we need 1744 kJ/mol + 990 kJ/mol = 2734 kJ/mol

we will then add up the bond energy of each bond formed.

For 2 moles of H2O we need 22463 = 1852 kJ/mol

Therefore, the energy needed to break the necessary bonds in the formation of two moles of water is 2734 kJ/mol - 1852 kJ/mol =

882 kJ/mol

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The percentage yield is 79.4%. This means that 79.4% of the expected amount of C3H8 was collected from the reaction.

Percentage yield is a measure of the efficiency of a chemical reaction. It is calculated by dividing the actual yield of a product by the theoretical yield, and then multiplying that number by 100. The theoretical yield is the amount of product that would be produced if the reaction went to completion. The actual yield is the amount of product actually obtained in a reaction.

This can be calculated by taking the actual yield of 125.4 g C3H8 and dividing it by the expected yield of 158.4 g C3H8 and multiplying it by 100.
(125.4 g C3H8 ÷ 158.4 g C3H8) × 100 = 79.4%

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Answer:

0.87 moles of sodium acetate is equal to 5.22 formula units of sodium acetate. This is calculated by multiplying the number of moles (0.87) by the number of formula units (6) per mole

Explanation:

[tex]C_{6} H_{6}[/tex] will be the molecular formula of the given chemical substance. The simplest whole-number ratio of the atoms in a compound is shown by empirical formulae.

the number of each type of atom in a molecule is shown by molecular formulas, and the bonds between the atoms in a molecule are shown by structural formulas.

Empirical Formula Mass = (12.01 + 1.008) u

Empirical Formula Mass = 13.018 u

Molecular formula = (Empirical Formula)ₙ

n = Molecular formula Mass/Empirical Formula Mass  

n = 78.11 u/13.02 u  

n = 6

Molecular formula = (CH)₆

Molecular formula = C₆H₆

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1- Shipper's package in order to protect the material. 2- Drivers placard their vehicles to indicate the risk. 3- To decide which placards (if any) you need, you need to know: The particular hazardous material being transported, The quantity of the hazardous material being transported.

The classification of the hazardous material being transported (UN number)The United Nations (UN) number identifies a specific hazardous material and is used to classify and identify materials for transportation. The UN number is used to determine the appropriate placarding for a vehicle transporting hazardous materials. It should be noted that the UN number, the quantity and the classification are used to determine the proper labeling, packaging, and documentation required for transportation of hazardous materials.

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Option C: silicon (Si) and germanium (Ge) is he pair of elements that has atoms with the same number of valance electrons.

Atoms that belong to the same periodic table group will share the same number of valence electrons. Therefore, the valence electrons of Cl, and I of group 17, Na, and Ca of group 1, and C, Si, and Ge of group 14 are the same. The outermost level contains valence electrons, which are crucial in chemical bonding. Thus, option C is the right choice.

The number of valence electrons shared by elements in the same column or group of the periodic table is called the valence electron number. For instance, group 1's alkali metals all have a single valence electron. This indicates that sodium and lithium both have the same number of valence electrons. In the study of chemistry, valence, often known as valency, is the characteristic of an element that determines how many other atoms it may combine with.

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Complete question is:

Which pair of elements has atoms with the same number of valence electrons ?

a. indium (In) and lead (Pb)

b. potassium (K) and bromine (Br)

c. silicon (Si) and germanium (Ge)

d. astatine (At) and radon (Rn)

The surface of the sun has a temperature of about 5800K and consists largely of hydrogen atoms. The rms speed of a hydrogen atom at this temperature is 11991 m/s

Given that :

Temperature = 5800 K

The rms speed expression is given as :

Vrms = √3KT / m

mass , m = 1.67 × 10⁻²⁷

The rms speed is given as :

Vrms = √ 3 × 1.38 × 10⁻²³ × 5800 / 1.67 × 10⁻²⁷

Vrms = 11991 m/s

Thus, the rms speed at temperature  of the 5800 K and it consist the largely of the hydrogen atom is 11991 m/s.

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Multivalent elements are metals that can form more than one stable ion charge. Polyatomic ions are ions that consist of more than one atom.

The primary distinction between a multivalent element and a polyatomic ion is that multivalent elements have several valencies, whereas polyatomic ions contain multiple atoms that are covalently bound to each other. The prefix "multi-" means "many".

The normal ion has only one element, chlorine. The polyatomic ion contains two elements: chlorine and oxygen.

Therefore, metals that can create more than one stable ion charge are known as multivalent elements. Polyatomic ions are ions with more than one atom.

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Answer:

pH= 8.30

Explanation:

The pH of the solution with a [H+] concentration of 5x10-9 ml/dm^3 is 8.30. This can be calculated using the pH to H⁺ formula: pH=−log([H+]). Substituting the given [H+] concentration, we get: pH = −log(5x10-9) = 8.30.

The total 178571.42 kg of iron would be formed from 125 kg of Fe2O3 in the blast furnace.

The blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. Blast refers to the combustion air being forced or supplied above atmospheric pressure. It is a block that smelts ores, raw metals and metal armor and tools twice as quickly as a furnace but cannot smelt anything else. In a blast furnace, Iron (III) oxide reacts with carbon to produce molten iron and carbon monoxide.

Fe2O3 + 3C ----> 2Fe + 3CO

Fe2O3 is unstable because the above reaction is thermodynamically favored.

1 mole Fe2O3 = 2×56+3×16 = 160g

2 mole Fe = 112g = 0.112kg

From 125 kg of Fe2O3,

= 160 × 125 /0.112

= 178571.42 kg of Iron formed.

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To make 75.0 mL volume of 3.50 M molarity HCl, 21.9 mL of 12.0 M HCl are needed.

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most widely used unit for molarity in chemistry. The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity. The total number of moles of solute in a given solution's molarity is expressed as moles of solute per liter of solution.

Here,

M1V1=M2V2

12V=75*3.5

V=75*3.5/12

V=21.875 mL

The volume of 12.0 M molarity HCl is required to make 75.0 mL of 3.50 M HCl is 21.9 mL.

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Among the given elements, S and Sr forms ionic compound. Sr metal donate electron to sulfur forming ionic compound.

Ionic compounds are formed between metals and non metals. The metals are electropositive elements. They easily loss electrons in chemical bonding.

Strontium is an alkaline earth metal with two valence electrons. Strontium forms ionic compounds with non-metals by donating its two valence electrons.

Sulfur needs two more electrons to achieve octet. Hence, it easily gain two electrons from strontium metal forming the ionic compound SrS.

Hence, option c is correct.

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Political action committees that promote candidates for public office are created by numerous interest groups.

A community within a larger organisation that shares the objective of developing a certain area of learning, expertise, or technology is known as a special interest group. Members may communicate, physically meet, and organise conferences as they collaborate to influence or create solutions in their specialised fields. Three basic functions are provided by interest groups: member assistance, policy creation, and advocacy. Political parties focus on a broader variety of issues and work to win elections; interest groups, in contrast, have a more focused agenda and don't participate in politics. Political action committees that promote candidates for public office are created by numerous interest groups.

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Catalysts are enzymes. Although some RNA molecules also function as enzymes, they are often proteins. Temperature, pH, & concentration are just few examples of variables that might have impact on enzyme activity.

What exactly are enzymes and what varieties are there?

The International Association of Microbiologists (I U B) classifies enzymes into six functional categories depending on the types of reactions they are employed to catalyse. The six different categories of enzymes include isomerases, hydrolases, peroxides, lyases, transferases, and ligases.

How many different kinds of enzymes are there?

According on the type of process they catalyse, enzymes fall into one of seven categories. These groups include ligases, translocases, hydrolases, lyases, isomerases, and oxidoreductases.

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Answer: The maximum resultant force: 12 N

               The minimum resultant force: 2 N

Explanation: A force is actually a vector. And if there is no angle among these two forces (or let's say "vectors"), this is the maximum situation (not a general rule, but it is valid for this question because both vectors are positive) and we add these forces up for the solution. So, the magnitude of this resultant force would be 12 N.

Drawing one force vector which has 12 N magnitude and acts on the object would be enough for the solution.

However, the angle among them should be 180 degrees so that the minimum situation exists. So, we are actually subtracting these two forces instead of adding them here.

This means that drawing one force vector which has 2 N magnitude would be enough for the other solution.