a 0.250 m solution of a weak acid has a ph of 2.67. what is the value of ka for the acid?

Answer:

See below!

Explanation:

An acid (A) will have acid in the name.  It will also have a hydrogen bonded to an electronegative compound.  A molecular compound (M) will have nonmetals and/or hydrogen.  An ionic compound (I) will have nonmetals and first and second column metals.  It could also include charged compounds.  A transition metal (TM) will have a transition metal in the compound.

The formulas for TM and I are made by balancing the charges of the atoms to equal zero.  The formulas for M can be found from the name itself.  The formulas for A have to be memorized.

TM  ==>  copper (II) oxide  ==>  CuO

A  ==>  hydrosulfuric acid  ==>  H₂S

TM  ==>  iron (III) fluoride  ==>  FeF₃

TM  ==>  lead (II) chlorate  ==>  PbCl₂

A  ==>  hydrochloric acid  ==> HCl

M  ==> dihydrogen monoxide  ==>  H₂O

A  ==>  sulfurous acid  ==>  H₂SO₃

I  ==>  potassium oxide  ==>  KO

I ==>  ammonium hydroxide  ==>  NH₄OH

M  ==> nitrogen trioxide  ==>  NO₃

I  ==>  aluminum phosphate  ==>  AlPO₄

To name ionic (I) compounds, simply put the name of the metal with the nonmetal.  But, for the nonmetal change, the ending to "-ide".  To name acids (A), say hydro- with the atom/compound it is attached to and end with acid.

I  ==>  MgSO₄  ==>  magnesium sulfate

I  ==>  HgS  ==>  mercury sulfide

I  ==>  Na₂S  ==>  sodium sulfide

A  ==>  HF  ==>  hydrofluoric acid

I  ==>  KCN  ==>  potassium cyanide

By integrating the differential equation and determining the residence time at which the conversion reaches 80%, we can find the space time needed. The goal is to minimize the percentage of error in the calculation.

To solve this problem, we need to set up and solve the differential equation for the plug flow reactor. The rate equation given is γA = 10^(-2)C^(1/2) (mol/lit bee), where γ is the reaction rate constant and C is the concentration of A.

The differential equation for the plug flow reactor can be written as:

dCA/dV = -rA

Where CA is the concentration of A, V is the reactor volume, and rA is the rate of reaction. Since the reaction is homogeneous and follows the stoichiometry A → 3R, the rate of reaction is given by:

rA = -1/3 dCA/dt

Using the chain rule, we can rewrite the differential equation as:

dCA/dV = -1/3 dCA/dt dV/dt

The volume V is related to the reactor residence time τ (space time) by:

V = F₀τ

Where F₀ is the inlet molar flow rate. In this case, the feed consists of 50% A and 50% inert, so the inlet molar flow rate is 0.0325 mol/lit * 0.5 = 0.01625 mol/lit.

Now, we can substitute the expressions for V and dV/dt into the differential equation and rearrange it as:

(1/τ) dCA/dτ = -1/3 dCA/dt

To solve this differential equation numerically, we can use a method like the fourth-order Runge-Kutta method. We start with the initial condition CA = CA₀ at τ = 0 and integrate the differential equation until the conversion reaches 80% (CA = 0.0325 * 0.5 * 0.2 = 0.00325 mol/lit).

By varying the residence time τ and checking the conversion, we can determine the residence time at which the conversion is closest to 80%. This residence time will give us the space time needed for 80% conversion.

To minimize the percentage of error in the calculation, we can adjust the step size in the numerical integration method to achieve a desired level of accuracy. Smaller step sizes generally lead to more accurate results but require more computational effort.

By implementing the numerical integration method and adjusting the step size, we can find the space time needed for 80% conversion with minimized error.

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Answer:

1. Latitude

2. Ocean currents

Explanation:

Answer:

-1

Explanation:

Molecules that have the same chemical formula (same numbers of each atom) but different three-dimensional shapes are called isomers.

The isomers can be categorized into following categories:

1) Chain Isomers - The molecules known as chain isomers have the same chemical formula but differing configurations of the carbon'skeleton. The foundation of organic compounds are chains of carbon atoms, and for many of these molecules, this chain can be structured in a variety of ways, either as a single, uninterrupted chain or as a chain with numerous side groups of carbons branching off.

2) Position Isomers - Position isomers are based on the movement of a 'functional group' inside the molecule. The component of a molecule that provides it its reactivity is referred to in organic chemistry as a functional group.

3) Functional isomers - These are isomers, also known as functional group isomers, in which the kind of functional group in the atom is altered but the molecular formula is left unchanged. By rearranging the atoms in the molecule such that they are connected to one another in various ways, this is made feasible. For instance, a typical straight-chain alkane (which merely has carbon and hydrogen atoms) can have a functional group isomer that is a cycloalkane, which is only a group of carbon atoms bound together to create a ring

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Explanation:

The reaction is CaCO

3

+2HCl→CaCl

2

+H

2

O+CO

2

.

Thus, 2 moles of HCl reacts with one mole of calcium carbonate to produce one mole each of calcium chloride, water and carbon dioxide respectively.

Hence, 3 moles of HCl will react with excess of calcium carbonate to produce 3×

2

1

=1.5 mol of carbon dioxide

To find the actual amount of reactants that are needed to get a desired amount of product, you would need the balanced chemical equation for the reaction, the molar mass of the reactants and products, and the desired amount of product.

When balancing a chemical equation, coefficients are added to ensure that the same number of atoms of each element is present on both sides of the equation. This means that the coefficients represent the number of moles of each reactant and product that are involved in the reaction. Therefore, the balanced chemical equation is essential for determining the stoichiometry of a reaction, which is the study of the quantitative relationships between reactants and products in a chemical reaction. Once the balanced chemical equation is known, the molar mass of each reactant and product is needed to convert between mass and moles. Molar mass is the mass of one mole of a substance, which is found by adding up the atomic masses of all the atoms in a molecule. For example, the molar mass of water (H2O) is 18.015 g/mol because it contains two hydrogen atoms with a molar mass of 1.008 g/mol each and one oxygen atom with a molar mass of 15.999 g/mol.

To determine the actual amount of reactants needed to produce a desired amount of product, the stoichiometry of the reaction is used to calculate the theoretical yield, which is the maximum amount of product that can be obtained from a given amount of reactant. The theoretical yield is found by using the balanced chemical equation to determine the mole ratio between the reactants and products and then multiplying by the amount of limiting reactant present. The limiting reactant is the reactant that is completely consumed in a reaction, limiting the amount of product that can be formed. To determine the limiting reactant, the amounts of each reactant are compared using their molar masses and the mole ratio from the balanced chemical equation. The reactant that produces the least amount of product is the limiting reactant.
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Answer:

b. 760 g

Explanation:

The mass of the solution = 800 g

5% of NaCl by mass of the solution can be determined as follows;

    5% of 800  =  \(\frac{5}{100}\) × 800

                       = 5 × 8

                       = 40 g

The mass of NaCl in the solution is 40 g.

The mass of water = mass of solution - mass of NaCl

                               = 800 - 40

                              = 760 g

Therefore, the mass of water required is 760 g.

Answer: Extensive!

Explanation:

To determine the pore-water pressure (kn/m^2) at the locations where piezometers a through e have been installed, we need to use the unit weight of water, which is 9.81 kn/m^3.

Since the unit weight of water is given, we can calculate the pore-water pressure using the following equation: Pore-water pressure (kn/m^2) = Unit weight of water (kn/m^3) * Depth of piezometer (m) Unfortunately, the depths of piezometers a through e have not been provided in the question. Without this information, it is not possible to calculate the pore-water pressure at these specific locations. Given that the unit weight of water is provided as 9.81 kN/m³, we can convert the pressure head to kN/m² using the following formula: Pore-water pressure (kN/m²) = Pressure head (m) x Unit weight of water (kN/m³) Without specific readings or measurements from the piezometers, it is not possible to calculate the pore-water pressure at each location accurately.

The readings from the piezometers provide the necessary information about the water pressure at those specific points.
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The molar mass of the equation S   +   6 HNO3  -->  H2SO4  +  6 NO2  +   2 H2O is 0.7g H2O.

This is a rather straightforward application of stoichiometry. We simply convert our mass of nitric acid into moles, so we can use the stoichiometric ratios provided in the balanced equation to our advantage:

(135.8g HNO3)(1 mol HNO3/63g HNO3)(2 mol H2O/6 mol HNO3)

molar mass = 0.7g H2O

Molar mass is a fundamental concept in chemistry that refers to the mass of one mole of a substance. A mole is a unit of measurement used to express the number of particles in a sample, such as atoms, molecules, or ions. One mole of any substance contains Avogadro's number of particles, which is approximately 6.02 x 10^23 particles.

The molar mass of a substance is calculated by adding up the atomic masses of all the atoms in a molecule or formula unit. The atomic mass is the mass of an individual atom, expressed in atomic mass units (amu). The molar mass is then expressed in grams per mole (g/mol). Molar mass is a useful concept in chemistry because it allows chemists to convert between the mass of a substance and the number of particles present in a sample.

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The correct answer is "E. none of the above" because none of the given options accurately represent the element description "186OA". It seems that the description might be incomplete or incorrect, as it does not clearly indicate the specific isotope of oxygen.

The given element description, "186OA", appears to refer to an isotope of oxygen. To understand its meaning, let's evaluate the given options:

A. 6 oxygen atoms with 18 neutrons: This option suggests the presence of 6 separate oxygen atoms, each with 18 neutrons. However, the description does not indicate multiple atoms or a specific neutron count.

B. An oxygen atom with 6 protons and 12 neutrons: Oxygen, by definition, has 8 protons. This option incorrectly suggests 6 protons, which would correspond to a different element.

C. An oxygen atom with 6 neutrons and 12 protons: This option incorrectly suggests 12 protons, which would correspond to a different element. Oxygen must have 8 protons.

D. 18 oxygen molecules with 6 neutrons each: This option refers to molecules rather than atoms and incorrectly suggests 6 neutrons per oxygen atom. An oxygen atom typically has 8 neutrons.

E. None of the above: Since none of the previous options accurately describe the given element description, this option is the most appropriate.

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Answer:

a)true. b)true c)false d)true e)false f)false g)true h)true

Answer:

2.5 g of platinum

Explanation:

Recall that a catalyst is a specie added to a reaction system to increase the rate of reaction. A catalyst does not participate in the chemical reaction hence it remains unchanged at the end of the chemical reaction. A catalyst merely provides an alternative reaction pathway by lowering the activation energy of the reaction system. Hence a catalysed reaction usually proceeds faster with less energy requirement than the uncatalysed reaction.

Since the catalyst does not participate in the reactions and remains unchanged at the end of the reaction, the mass of platinum will remain the same (2.5g). The mass can only change if a specie participates in the chemical reaction. Hence the answer.

2.5 g of platinum will there be left in the vessel at the end of the reaction

The following information should be considered:

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Answer:

D

Explanation:

Trust me

The expected electronic configuration of elemental (non-ionized) copper is D. [Ar] \(4s^{1} 3d^{10}\).

Copper is a transition metal with 29 protons in its nucleus, which means it has 29 electrons surrounding it. These electrons are distributed into different energy levels or orbitals in a specific order based on the Aufbau principle, Pauli exclusion principle, and Hund's rule. The first two electrons of copper occupy the 1s orbital, followed by two electrons in the 2s orbital and six electrons in the 2p orbital. Then, the next two electrons fill the 3s orbital, followed by six electrons filling the 3p orbital. Finally, the remaining ten electrons occupy the 4s and 3d orbitals.

In the case of copper, the 4s orbital is filled with one electron, and the 3d orbital is filled with ten electrons. The 4s orbital is lower in energy than the 3d orbital, and this anomaly is due to the stability gained from half-filled and fully-filled d orbitals. Hence, the expected electronic configuration of elemental copper is [Ar] \(4s^{1} 3d^{10}\).

This electronic configuration explains the chemical and physical properties of copper, such as its ability to form complexes, its high electrical conductivity, and its characteristic reddish-brown color. Understanding the electronic configuration of elements is essential for predicting their reactivity, bonding, and behavior in different chemical reactions. Therefore, option D is correct.

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Answer:

22.5%

Explanation

% composition = Molar mass of S

------------------------ x 100

Molar mass of Na2SO4

= 32.065

------------ x 100

142

=0.225 x 100

= 22.5%

Answer:

Antoine Laurent Lavoisier (1743 -94), a French chemist was the first to establish an experimentally useful definition of an element. Elements can be normally divided into metals, non metals and metalloids.

Since this is a single replacement reaction, the equation for the reaction is:

\(\text{Mg}+\text{H}_{2}\text{SO}_{4} \longrightarrow \text{MgSO}_{4}+\text{H}_{2}\)

From this, we know that for every mole of magnesium consumed, 1 mole of hydrogen is produced.

The atomic mass of magnesium is 24.305 g/mol, so 72 grams of magnesium is 72/24.305 = 2.9623534252211 moles.

This means we need to find the mass of 2.9623534252211 moles of hydrogen.

Hydrogen has an atomic mass of 1.00794 g/mol, so doubling this to get the formula mass of of \(\text{H}_{2}\), we get 2.01588 g/mol, which his a mass of:

(2.01588)(2.9623534252211). which is about 5.97 g

Explanation : số mol glucose 3.8M là :

n = Cm . V = 3.8 . 25 =95

=> Cm khi pha loãng = \(\frac{n}{V}\) = \(\frac{95}{250}\) = 0.38M

According to molar concentration, the  concentration of a solution formed by diluting 25.0 ml of a 3.8 M glucose solution to 250 ml is 0.38 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case of 2 solutions given it is calculated as M₁V₁=M₂V₂,on substitution, M₂=3.8×25/250=0.38 M.

Thus,  the  concentration of a solution formed by diluting 25.0 ml of a 3.8 M glucose solution to 250 ml is 0.38 M.

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Answer:

C

Explanation:

When the preexisting molecular links are broken and new bonds are created between oxygen and hydrogen atoms, hydrogen molecules react strongly with oxygen molecules.

The outcome is an explosive release of energy and the formation of water since the reaction's products are at a lower energy level than its reactants.

The most well-known instance of a synthesis reaction is the burning of hydrogen and oxygen to produce water.

Most of the water that was created was in the form of vapors, which mixed with cosmic dust on the way to the earth's surface. These water vapors condensed into oceans, seas, rivers, and lakes when the world first came into existence.

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The molecular formula of an antibacterial drug is C17H18FN3O3. We are to determine how many fluorine atoms are in a 150-mg tablet of this drug. To get started, we need to calculate the molar mass of the compound: Molecular mass of C17H18FN3O3 = 329.35 g/mol. Dividing the mass of the drug by its molar mass and multiply by Avogadro's number will give us the number of moles of the drug present in a 150-mg tablet: No. of moles = (150 mg) / (329.35 g/mol) = 0.4554 x 10^-3 mol.

The molecular formula of the drug tells us that for every molecule of the drug, there is one fluorine atom. Therefore, the number of fluorine atoms in the tablet is equal to the number of molecules of the drug present in the tablet. We can calculate the number of molecules present in the tablet as follows: Number of molecules = (0.4554 x 10^-3 mol) x (6.022 x 10^23 molecules/mol)= 2.743 x 10^20 molecules. Therefore, the 150-mg tablet of the drug contains 2.743 x 10^20 fluorine atoms.

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Answer:

gram

Explanation:

Gram is a SI unit       (International Ststem of units)

   other SI units :   kg , meter, ampere,  Kelvin

pound   gallon and foot are   SAE (or imperial) units

Answer:

It's acidic.

Explanation:

Natural selection is a process in which organisms that are better adapted to their environment tend to survive and produce more offspring. These offspring are likely to inherit the traits that made their parents successful, which can lead to predominance and suppression of certain traits in a population.

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Answer:

zero

Explanation: