Chemistry balance QUESTION
reaction: AB₂C (g) → B₂ (g) + AC (g), find the value of K. At equilibrium, [AB₂C]=0.0168 M, [B₂]= 0.007 M, and [AC] = 0.0118 M

Answer:

25 ml of stock

Explanation:

Molarity x Volume of Concentrated Stock = Molarity x Volume of  Diluted Stock

=> Mc x Vc = Md x Vd => (0.5M)(x) = (0.25M)(50 ml)

=> x = Vc = (0.25M x 50 ml) / (0.50M) = 25 ml of stock

By solving the equation we get:NaHCO3 has a molecular mass   84 g/mol.

Na2CO3 has a molecular weight of 0.02 mol.

Mass of Na2CO3 = **2.12 g**

Daltons or atomic mass (Da or u) are used to measure molecular mass, which is the mass of a certain molecule1. The molecular mass indicates a molecule's mass in relation to the 12 C atom, whose mass is assumed to be 12. The molar mass, which is stated in g/mol1, is the mass of a particular material divided by the amount of that substance. Hence, the molecular mass is the mass of a single particle or molecule, whereas the molar mass is the average of numerous particles or molecules

The equation below illustrates how heating causes sodium hydrogencarbonate to break down:

Na2CO3(s) + H2O(g) + CO2 = 2 NaHCO3(s) (g)

a) I The formula: can be used to determine how many moles of sodium hydrogencarbonate were utilised.

Molar mass = mass times the number of moles

NaHCO3 has a molecular mass of (23 + 1 + 12 + 48) g/mol, or 84 g/mol.

3.36 g of NaHCO3 divided by 84 grammes per mole yields 0.04 moles.

ii) Stoichiometry can be used to calculate the quantity of sodium carbonate produced:

We can deduce from the balanced equation that 2 moles of NaHCO3 result in 1 mole of Na2CO3.

Na2CO3 has a molecular weight of (0.04 mol 2 mol) 1 mol = 0.02 mol.

iii) The formula Mass = Number of moles Molar mass can be used to determine the mass of sodium carbonate produced.

molar volume of Na2CO3 = (23 × 2 + 12 + 48) g/mol = 106 g/mol

Mass of Na2CO3 = 0.02 mol × 106 g/mol = **2.12 g**

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Answer: Yo! hope this helps you dude

When ice is placed into a beaker filled with water, the water level does not drop because of the concept of displacement. When the ice is added, it displaces an amount of water equal to its own volume. This means that the ice takes up space in the beaker, pushing out an equal amount of water to make room for itself. Therefore, the total volume of water and ice in the beaker remains the same, and the water level does not drop.

This is due to the fact that the density of ice is lower than that of water and when the ice is placed into the water, it will float on the surface, pushing out an amount of water equal to its own volume.

Additionally, when the ice melts, it will release the same amount of water it displaced before and the water level will not change.

Explanation:

391.56 Joules

The formula for calculating the amount of heat required is expressed as:

where:

• m is the mass = 45.3g

• specific heat of caesium c = 0.252J/gC

• change in temperature △t = 120.2 - 85.9 = 34.3 degrees celsius

Substitute the given parameters into the formula

Hence the amount of heat required is 391.56 Joules

Answer:

Consider the following equilibrium:

2H2(g)+S2(g)⇌2H2S(g)Kc=1.08×107 at 700 ∘C.

What is Kp?

Explanation:

Given,

\(Kc=1.08 * 10^7\)

The relation between Kp and Kc is:

\(Kp=Kc * (RT)^d^e^l^t^a^(^n^)\)

Where delta n represents the change in the number of moles.

For the given equation,

The Delta n = Number of moles of products - number of moles of reactants

(2-(2+1))

=-1.

Hence,

Kp=Kc/RT.

Thus,

\(Kp=1.08 * 10^7 / 8.314 J.K6-1.mol^-^1 x 973 K\\Kp=1335.06\)

The answer is Kp=1335.06

The value of \(K_p\) is \(1.35\times 10^5\).

Explanation:

The relation between \(K_p \& K_c\) is given by:

\(K_p=K_c(RT)^{\Delta n_g}\)

Where:

\(K_c\) = The equilibrium constant of reaction in terms of concentration

\(K_p\) = The equilibrium constant of reaction in terms of partial pressure

R= The universal gas constant

T = The temperature of the equilibrium

\(n_g\)= Change in gaseus moles

Given:

An equilibrium reaction, 700°C:

\(2H_2(g)+S_2(g)\rightleftharpoons 2H_2S(g),K_c=1.08\times 10^7\)

To find:

The equilibrium constant in terms of partial pressure, \(K_p\).

Solution:

The equilibrium constant of reaction in terms of concentration= \(K_c\)

\(K_c=1.08\times 10^7\)

The equilibrium constant of reaction in terms of partial pressure =\(K_p=?\)

The gaseous moles of reactant side = \(n_r= 3\)

The gaseous moles of product side = \(n_p= 2\)

The temperature at which equilibrium is given = T

\(T = 700^oC+273.15 K=973.15K\)

The change in gaseous mole  = \(n_g=n_p-n_r=2-3 = -1\)

\(K_p=1.08\times 10^7\times (0.0821 atm L/mol K\times 973.15 K)^{-1}\\K_p=1.35\times 10^5\)

The value of \(K_p\) is \(1.35\times 10^5\).

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Answer: empty space or vacuum

Explanation: The empty space between the atomic cloud of an atom and its nucleus is just that: empty space, or vacuum.

Answer:

Empty space

Explanation:

The empty space between the atomic cloud of an atom and its nucleus is just that: empty space. That's the simple answer, however, sub-atomic particles such as electrons, protons and neutrons need to be treated as quantum objects. They have a wave function which can be thought of as the 'spread' in the particle's location. Electrons are 'spread out' quite a bit in their orbits about the nucleus. In fact, the wave-functions for electrons in s-orbitals about a nucleus actually extend all the way down into the nucleus itself. In this sense, then, the space between the electrons and the nucleus isn't really 'empty.' The electrons and the protons/neutrons are constantly interacting, either electromagnetically or through the weak force. In quantum field theory we would say that these particles are constantly exchanging photons (in the case of electromagnetism) or heavy gauge bosons (in the case of the weak force). So you might say that the otherwise 'empty' space between the electrons and nucleus is 'filled' with these quanta carrying forces.

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Answer:

The density of tin is 7.31 g/cm³.

Explanation:

Given that the formula of density is D = m/v where m represents mass and v is volume :

D = 16.52/2.26

D = 7.31 g/cm³ (3sf)

Answer:

True

Explanation:

superman spedierman

A sample of gas at 2815 torr is cooled from 150.0 C to 100.0 C. Assuming the volume is constant, 2482.2torr is the pressure in atm of the gas at 100.0 C.

The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure (symbol: p / P). The pressure in relation to the surrounding air pressure is known as gauge pressure, also spelt gauge pressure.

Pressure is expressed using a variety of units. Some of these are calculated by dividing a unit of force by a unit of area; for instance, the metric system's unit of pressure, a pascal (Pa), is equal to one newton / square metre (N/m2).

P₁/T₁=P₂/T₂

2815 ×373/423=2482.2torr

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Answer:   if it has to have a definite physical and chemical properties. Mixture is when two atoms combine but not chemically.

Explanation:

Covalent compounds are held together with an intra molecular attraction which is weaker than metallic bond

hence covalent compounds exist as liquids, gases and soft solids

Answer:

hfghfhjcbnggf

Explanation:

layer1

layer 2

Approximately 7.26 grams of sodium propanoate must be dissolved in 0.25 dm^3 of 1 mol dm^-3 propanoic acid to create a buffer of pH 4.87.

To calculate the mass of sodium propanoate (C2H5COONa) that must be dissolved in 0.25 dm^3 of 1 mol dm^-3 propanoic acid (C2H5COOH) to create a buffer at pH 4.87, we can use the Henderson-Hasselbalch equation:

pH = pKa + log ([A-] / [HA])

where:

pH is the desired pH of the buffer (4.87 in this case)

pKa is the dissociation constant of the weak acid (4.87 in this case)

[A-] is the concentration of the conjugate base (sodium propanoate)

[HA] is the concentration of the weak acid (propanoic acid)

In a buffer solution, the ratio of the concentrations of the conjugate base and the weak acid is important. Let's assume that x moles of sodium propanoate are dissolved in 0.25 dm^3 of 1 mol dm^-3 propanoic acid. This means the concentration of propanoic acid will be (1 - x) mol dm^-3, and the concentration of sodium propanoate will be x mol dm^-3.

According to the equation, we have:

4.87 = 4.87 + log (x / (1 - x))

Simplifying the equation, we get:

0 = log (x / (1 - x))

Now, let's solve for x:

x / (1 - x) = 1

x = 1 - x

2x = 1

x = 1/2

So, the concentration of sodium propanoate (C2H5COONa) in the buffer solution should be 0.5 mol dm^-3.

To calculate the mass of sodium propanoate needed, we need to convert the volume of the solution to moles. Since the concentration is 0.5 mol dm^-3 and the volume is 0.25 dm^3, the number of moles of sodium propanoate required is:

moles = concentration × volume = 0.5 mol dm^-3 × 0.25 dm^3 = 0.125 moles

The molar mass of sodium propanoate is:

(2 × atomic mass of carbon) + (5 × atomic mass of hydrogen) + atomic mass of oxygen + atomic mass of sodium

= (2 × 12.01 g/mol) + (5 × 1.008 g/mol) + 16.00 g/mol + 22.99 g/mol

= 58.08 g/mol

Finally, we can calculate the mass of sodium propanoate using the number of moles:

mass = moles × molar mass = 0.125 moles × 58.08 g/mol = 7.26 grams

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Answer:

Charged ion

Explanation:

The statements that are correct is that electrons are attracted towards higher potential and protons are attracted towards lower potential. So the correct option is d. I & IV

Electrons are particles that are negatively charged so if it is placed in an electric field it will move from negative to positive, due to its negative charge, then it will attract a higher potential.

Protons are particles that are positively charged so if it is placed in an electric field it will move from a positive to a negative side, then due to its positive charge, it will be attracted to a lower potential.

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The precipitates that will be formed respectively from the reactions would be:

Precipitation reactions are reactions during which two aqueous salt solutions combine to produce one aqueous and one insoluble salt.

Following this definition, the precipitates that will be formed from each of the reactions can be deduced as follows:

The production of precipitates follows solubility rules. Some of the rules are:

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To prepare a 0.12 M solution of FeCl₃, the amount of solid FeCl₃ to be dissolved in a given volume of solvent will be 9.72 grams.

Given,

Molarity of FeCl₃ (M)= 0.12 M

The molecular weight (m) of FeCl₃ is  = 162 gm

The volume of the solution (V) to be prepared is =500 ml

The amount of FeCl₃ to be dissolved to make a 0.12 M solution is= x

So,

MV= x ÷ m × 1000

0.12× 500 = x ÷ 162 × 1000

x = 60 × 162 ÷ 1000

x= 9.72 gm

So 9.72 grams of FeCl₃ is dissolved to make 500 ml of 0.12 M solution.

For preparing 0.4 M HCl from 4M HCL:

If we need to make 500 ml of solution with 0.4M of HCL, then we use the formula:

M₁V₁= M₂V₂

0.4 × 500= 4 × x

x= 50 ml

So 50 ml of 4M HCL is taken to make 0.4 M HCL.

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Answer:

Explanation:

Alkanes are saturated hydrocarbons (i.e they do not have any double/triple bond within there carbon chain). They have the general formula CₙH₂ₙ₊₂ where n is the number of carbons and starts with 1.

Since the predominant alkane in the olive has 27 carbons, it's molecular formula will be C₂₇H₍₂ₓ₂₇₎₊₂ ⇒ C₂₇H₅₆

The major alkane component in the olive leaves has 31 carbons, hence it's molecular formula will be C₃₁H₍₃₁ₓ₂₎₊₂ ⇒ C₃₁H₆₄

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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Answer:

This question is incomplete but the completed question is below

a) Identify the chemical equation that represents what would occur if naphthalene (C₁₀H₈) is burned in the presence of O₂

b) Identify how many moles of carbon dioxide would be released from the equation in (a) if 25.0 g of naphthalene were burned in the presence of excess oxygen.

c) Explain what would happen if only 1 mole of oxygen gas were available to interact with naphthalene in this reaction.

The answers to the questions are below

Explanation:

a) The chemical reaction here will be a combustion reaction. A combustion reaction involves the burning of a substance (in this case an organic compound) in excess oxygen to produce carbon dioxide and water.

The balanced equation below shows what will happen when naphthalene (C₁₀H₈) is burned in the presence of O₂

C₁₀H₈ + 10O₂  ⇒  10CO₂ + 4H₂O

b) The mass of naphthalene (C₁₀H₈) from the equation above is

when C= 12 and H = 1; C₁₀H₈ = (10 × 12) + (1 × 8) = 128 g

Mass of C₁₀H₈ from the equation in (a) above is 128 g

If 128g of C₁₀H₈ ⇒ 10 moles of CO₂

25g of C₁₀H₈ ⇒ X moles of CO₂

where X is the unknown

X = 25 × 10/128

X = 1.95 moles of CO₂

1.95 moles of CO₂ would be released from the equation in (a) if 25.0 g of naphthalene were burned in the presence of excess oxygen

(c) If just 1 mole of oxygen gas was available for the reaction in (a) above, the reaction would have been an incomplete combustion. An incomplete combustion is the process in which a substance burns in insufficient oxygen to produce carbon monoxide (CO) and water.

The moles of Na⁺ in 1.30 L is 0.2158 moles of Na⁺.

Concentration of a solution is the amount of solute present in a given volume of solution or solvent.

The concentration of the Na⁺ in the  intravenous saline solution contains 166 mEq/L.

1 mEq/Liter = 1 mmol/L

Moles of Na⁺ in 1.30 L = M

\(M = {166 mEq/L} * \frac{1 mmol/L}{1 mEq/L} * \frac{1.30 L}{1000 mL} = 0.2158\:moles\)

Moles of Na⁺ in 1.30 L = 0.2158 moles of Na⁺.

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We gain oxygen from trees through the process of photosynthesis. Photosynthesis is the biochemical process in which green plants, including trees, use sunlight, water, and carbon dioxide to produce oxygen and glucose (a form of sugar).

Trees have specialized cells called chloroplasts, which contain a pigment called chlorophyll. Chlorophyll absorbs sunlight energy.

The tree's leaves capture sunlight and use it to convert carbon dioxide (CO2) from the air and water (H2O) from the roots into glucose (C6H12O6) and oxygen (O2).

During photosynthesis, the chlorophyll in the chloroplasts helps to split water molecules into hydrogen ions (H+) and oxygen atoms (O). The oxygen atoms then combine to form O2 molecules.

The oxygen produced during photosynthesis is released into the atmosphere through tiny pores called stomata found on the surface of the tree's leaves. From there, it mixes with the surrounding air and becomes available for us to breathe.

In summary, trees produce oxygen as a byproduct of photosynthesis. They play a crucial role in maintaining the balance of oxygen and carbon dioxide in the atmosphere, providing us with the oxygen we need for respiration.

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Answer: The density because it stays the same with any same liquids or solids or gas with whatever amount of it is added. It only changes if the matter of state is different or there is any environmental change.

Answer: C

Explanation:

Right on edge 2020

The Bureau of Land Management was originally created to manage land for grazing, mining, developing oil and gas.

Land management refers to the activities which are done in order to protect and preserve the land as well the resources found on land.

The Bureau of Land Management was created to manage land in the US.

The Bureau of Land Management was originally created to manage land for grazing, mining, developing oil and gas.

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The equation is properly balanced when the coefficients are:

1PCl + 3H2O → 1POCl3 + 3HCl

A balanced chemical equation is a representation of a chemical reaction using chemical formulas and symbols to show the identities and relative amounts of the reactants and products involved in the reaction. The key feature of a balanced chemical equation is that it obeys the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.

To balance a chemical equation, one must ensure that the same number of atoms of each element is present on both the reactant and product sides of the equation. This is achieved by adjusting the coefficients of the chemical formulas, which represent the number of molecules or atoms of each substance involved in the reaction. Once the equation is balanced, it provides a complete and quantitative description of the chemical reaction, including the stoichiometry, or the relative amounts of reactants and products involved in the reaction.

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Answer: 15 METERS IN A SECOND

Explanation: 54km = 54000m    54000m / 60 = 900    900/60 = 15

1) List the known quantities

Initial conditions

Concentration 1: 1.6 M

Volume 1: 175 mL

Final conditions

Volume 2: 1 L

Concentration 2: unknown

2) Set the equation

3) Convert units

Volume

1 L = 1000 mL

4) Plug in the known quantities and solve for C2

The new concentration is 0.28 M.

.

Answer:

SeF4

Explanation:

SeF4

Answer:

The anwser is SeF4

Answer:

Electrical current drives nonspontaneous reactions in electrolytic cells.

Explanation:

Electrochemical cells are cells that produce electrical energy from chemical energy.

There are two types of electrochemical cells; voltaic cells and electrolytic cells.

A voltaic cell is an electrochemical cell in which electrical energy is produced from spontaneous chemical process while an electrolytic cell is an electrochemical cell where electrical energy is produced from nonspontaneous chemical processes. Current is needed to drive these nonspontaneous chemical processes in an electrolytic cell.

Answer:

electrolytic cells generate electricity through a non-spontaneous reaction while voltaic cells absorb electricity to drive a spontaneous reaction.

Explanation:

Answer via Educere/ Founder's Education