a concentrated solution of an acid with mw 63.0 g/mol has a molarity of 15.0 m and a density of 1.42 g/ml. what is its mass %?

The volume of CO2 gas produced when 2.00 mol of CaCO3 decomposes at STP is 44.8 L.

To determine the volume of CO2 gas produced when 2.00 mol of CaCO3 decomposes at STP (Standard Temperature and Pressure), we need to use the ideal gas law equation: PV = nRT.

At STP, the temperature is 0 degrees Celsius (273.15 K), and the pressure is 1 atmosphere (1 atm). The ideal gas constant (R) is 0.0821 L·atm/mol·K.

From the balanced equation, we can see that 1 mol of CaCO3 produces 1 mol of CO2 gas. Therefore, 2.00 mol of CaCO3 will produce 2.00 mol of CO2 gas.

Using the ideal gas law equation, we can calculate the volume of the CO2 gas:

PV = nRT

V = (nRT) / P

V = (2.00 mol)(0.0821 L·atm/mol·K)(273.15 K) / 1 atm

V = 44.8 L

Therefore, when 2.00 mol of CaCO3 decomposes at STP, it will produce 44.8 L of CO2 gas.

It's important to note that this calculation assumes ideal gas behavior and that the decomposition of CaCO3 occurs completely and instantaneously at STP. In reality, other factors such as reaction kinetics and deviations from ideal gas behavior may affect the actual volume of CO2 gas produced.

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The 18th and 19th century research in gases led to the acceptance of the kinetic-molecular theory of gases.

The kinetic-molecular theory of gases is a scientific principle that describes the behavior of gases at the molecular level. It was developed during the 18th and 19th centuries based on experimental observations and mathematical models. The theory states that:

Gases consist of tiny particles, such as atoms or molecules, that are in constant motion.

The particles are in constant collision with each other and with the walls of the container in which they are contained.

The average speed of the particles is directly proportional to the Kelvin temperature of the gas.

The pressure of a gas is directly proportional to the number of particles in the gas and to the average kinetic energy of the particles.

The kinetic-molecular theory of gases provided a more accurate and detailed explanation of the behavior of gases than the previous empirical models. It laid the foundation for the development of modern chemistry and physics and continues to be an important concept in these fields today.  

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Answer:

Ammonia/Formula

NH3

O3=NH3O3

ammonium nitride=NH₄NO₂

NH303=NH₄NO₂

ya Dekhi aaudaina

The Lewis structure of ammonia (NH3) is represented as:  H        H        H      NH2e-                1                  2                  3                   4  +NH3: : : Each line between the atoms represents a covalent bond, and each pair of dots represents a lone pair of electrons.

The structure that is the Lewis structure for ammonia (NH3) is a trigonal pyramid. It is also considered as the central atom with three outer atoms. This is a type of covalent bond that is present in nitrogen and hydrogen atoms in the ammonia molecule.

The Lewis structure is based on the octet rule which states that an atom wants to have 8 electrons in their outermost shell (in some cases, 2 electrons in their outermost shell for hydrogen) to achieve stability. The Lewis structure also shows the arrangement of atoms and bonds in a molecule. It helps to predict the geometry of the molecule and understand its properties.

To draw the Lewis structure of ammonia (NH3), we first need to count the total number of valence electrons in the molecule. Nitrogen has five valence electrons, and each hydrogen atom has one valence electron. So the total number of valence electrons in NH3 is 5+3(1) = 8 electrons. The nitrogen atom in NH3 is the central atom that is surrounded by three hydrogen atoms.

Nitrogen shares its three valence electrons with the three hydrogen atoms to form three covalent bonds. This results in a total of six electrons being used up, with two left over.The two remaining electrons form a lone pair on the nitrogen atom. The lone pair is responsible for the trigonal pyramid shape of the molecule.

The Lewis structure of ammonia (NH3) is represented as:  H        H        H      NH2e-                1                  2                  3                   4  +NH3: : : Each line between the atoms represents a covalent bond, and each pair of dots represents a lone pair of electrons.

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Answer:

water

Explanation:

the scientific answer would be hydro but it also means water

The pH at the equivalence point in the titration of 50.0 ml of 0.300 M CH₃COOH with 0.3 M NaOH is approximately 4.68.

To calculate the pH at the equivalence point, we need to determine the concentration of acetate ion (CH₃COO⁻) and hydronium ion (H³O⁺) at this point.

At the start of the titration, the initial concentration of acetic acid is 0.300 M and the initial concentration of hydronium ion is the same.

Let's say that x moles of NaOH are added to the solution. This will lead to the formation of x moles of acetate ion (CH³COO⁻) and x moles of hydroxide ion (OH⁻).

The final concentration of acetic acid will be (0.300 M - x M) and the final concentration of hydronium ion will be (x M).

The ionization constant (Ka) for acetic acid can be used to determine the concentration of acetate ion and hydronium ion in the solution. The equation for the ionization of acetic acid is:

CH₃COOH + H₂O ↔ CH₃COO⁻ + H₃O⁺

Ka = [CH₃COO⁻][H₃O⁺] / [CH₃COOH]

At the equivalence point, [CH₃COOH] = (0.300 M - x M), [CH₃COO⁻] = x M, and [H₃O⁺] = x M. Substituting these values into the equation for Ka, we get:

1.8 x 10⁻⁵ = (x)(x) / (0.300 - x)

Solving for x, we get:

x = 2.1 x 10⁻⁵ M

The pH at the equivalence point is equal to the negative log of the hydronium ion concentration:

pH = -log[H₃O⁺] = -log(2.1 x 10⁻⁵) = 4.68

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Considering the definition of complete combustion, the chemical equation for the complete combustion of C₇H₁₆ is:

C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)

Combustion is a chemical process through which heat is obtained. To achieve this, oxidation reactions are generated that allow the objective to be reached. It is necessary to have several elements:

Complete combustions are those reactions in which the combustible material is completely oxidized (consumed) and other oxygenated compounds are produced, such as carbon dioxide (CO₂) or sulfur dioxide (SO₂), as the case may be, and water (H₂O).

In other words, complete combustion is the result of the complete oxidation of the fuel but not the disappearance of the oxidizer, that is, the oxidation of all the fuel occurs. For this it is necessary that the necessary quantities of oxidizer and dry air intervene. All complete combustion releases, as a product of the reaction, carbon dioxide (CO₂) and water in the vapor state (H₂O).

Considering the definition of complete combustion, you get:

C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)

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The use of heat and alcohol to disinfect medical equipment is because both heat and alcohol are effective at killing microorganisms and bacteria.

Heat can be used to sterilize equipment by exposing it to high temperatures for a certain period of time, while alcohol, specifically ethanol and isopropyl alcohol, can be used to disinfect surfaces by denaturing the proteins and dissolving the lipid membranes of microorganisms.

Milk is not given to someone who accidentally ingests a heavy metal ion such as silver or mercury. Ingestion of heavy metal ions like silver or mercury can cause serious health problems and requires prompt medical attention. Milk is not an effective treatment for heavy metal poisoning, and chelating agents or other specific treatments are used for removing heavy metals from the body.

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the actual quantity of nitrogen, phosphorus, and potassium guaranteed to be applied to the maize field is 50 kg, 50 kg, and 25 kg, respectively.

For Nitrogen (N):

The percentage of nitrogen in the fertilizer is 20%. Therefore, the amount of nitrogen applied can be calculated as:

Nitrogen = (20/100) * 250 kg

Nitrogen = 0.2 * 250 kg

Nitrogen = 50 kg

For Phosphorus (P):

The percentage of phosphorus in the fertilizer is also 20%. Thus, the amount of phosphorus applied can be calculated as:

Phosphorus = (20/100) * 250 kg

Phosphorus = 0.2 * 250 kg

Phosphorus = 50 kg

For Potassium (K):

The percentage of potassium in the fertilizer is 10%. So, the amount of potassium applied can be determined as:

Potassium = (10/100) * 250 kg

Potassium = 0.1 * 250 kg

Potassium = 25 kg

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Answer:

The skin

Explanation:

The skin is the largest organ of the body. The skin and its derivatives (hair, nails, sweat and oil glands) make up the integumentary system. One of the main functions of the skin is protection. It protects the body from external factors such as bacteria, chemicals, and temperature.

The pH of the buffer containing 0.800 molar acetic acid and 1.00 molar sodium acetate is  approximately 4.84.

To calculate the pH of a buffer containing 0.800 M acetic acid and 1.00 M sodium acetate, you can use the Henderson-Hasselbalch equation:

pH = pKa + log10([A-]/[HA])

Here, pKa is the negative logarithm of the acid dissociation constant (Ka) for acetic acid, [A-] is the concentration of the conjugate base (acetate ion from sodium acetate), and [HA] is the concentration of the weak acid (acetic acid).

The pKa of acetic acid is approximately 4.74. Plugging the concentrations into the equation:

pH = 4.74 + log10(1.00 M / 0.800 M)

pH ≈ 4.74 + 0.1

pH ≈ 4.84

So, the pH of the buffer solution is approximately 4.84.

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Answer:

Number of Protons: 28

Explanation:

Brainliest Appriciatedddddd

Answer:

Question 6 options:

2

trough  

1

crest  

4

wavelength  

3

wave height

Explanation:

BRAINLYEST PLEASE

Answer:

s orbital

Explanation:

it has the lowest energy because

Paulis law state that orbitals with lower energy must be fill first before that of higher energy

and the s orbital is filled first

The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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The sigma bond between C2 and C3 in propylene (CH2CHCH3) is formed by a hybrid orbital of carbon atom and a hybrid orbital of a neighboring carbon atom. The hybridization of carbon atoms is sp2. Hybrid orbitals are formed when atomic orbitals mix to form new orbitals that result from bonding.

This hybridization provides a basis for the building of the σ bonding framework in propylene. In propylene, each carbon atom is connected to two other atoms. The carbon atom in the center of the molecule, C2, is bonded to two other carbon atoms and one hydrogen atom. It has an sp2 hybridization. The sigma bond between C2 and C3 is formed between an sp2 hybrid orbital of C2 and an sp2 hybrid orbital of C3.

The third carbon atom, C1, is also sp2 hybridized, but the shape of the orbitals is different. The orbitals of C1 and C2 have a planar structure, but the orbital shape of C3 is distorted due to the presence of the methyl group on C3. The hybridization of the methyl group's carbon atom is sp3, which results in the formation of a tetrahedral shape around the carbon atom. Therefore, the σ bond between C2 and C3 is formed by the overlap of two sp2 hybrid orbitals.

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105 grams of KCl will make a saturated solution in 300 grams of water at the 20° C.

The solubility of KCl at 20°C is 35 grams per 100 grams of water.

This means that a saturated potassium chloride solution at 20°C will have 35 g of dissolved salt for every 100 g of water.

A solution that can hold the most dissolved salt is said to be saturated. The solid will not dissolve if more solid is added to a saturated solution.

Mass of potassium chloride in 300 g of water in saturated solution

= \(\frac{35}{100}\)×\(300\)

= 105 grams

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Answer:

Option A, 66.5

Explanation:

use q (heat) = m(mass) * cp(specific heat) * deltat (change in temp)

q= 1172, m = 45.8, cp = 0.385

1172= (45.8) * (0.385) * Delta T

1172= 17.633 *DeltaT

1172/17.633 =DeltaT

66.5 =DeltaT

Answer:

The answer copper carbonate

To recognize a poisoning pattern, groups of drugs with similar actions, symptoms, and clinical signs are examined. These common signs and symptoms are referred to as the toxidrome. Hence, the correct option is (d) toxidrome.

What is a toxidrome?

A toxidrome is a group of symptoms and clinical signs that suggest a particular type of poisoning. In the presence of drug-induced toxicities, it is particularly useful for guiding therapeutic decision-making. The clinical signs and symptoms seen in toxidrome reflect the pharmacology of the toxicant, the dose of the toxicant, and the affected organ systems.

Toxidrome pattern

Toxidrome can be divided into five patterns, each of which is associated with a certain type of drug toxicity.

1. Cholinergic toxidrome

2. Anticholinergic toxidrome

3. Sympathomimetic toxidrome

4. Opioid toxidrome

5. Sedative-hypnotic toxidrome

What are the symptoms of a toxidrome?

The following are some of the symptoms that are common in most of the toxidromes:-

Ataxia-Mydriasis-Tachycardia-Tremors-Seizures-Agitation or confusion-Coma or decreased level of consciousness-Respiratory depression or arrest-Bradycardia and hypotension

Toxidrome is a useful tool in drug toxicity management because it can assist clinicians in determining the cause of the poisoning and the best treatment for it.

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The mass of sodium Tetraoxosulphate formed when 0.5 mole of sodium hydroxide react with Tetraoxosulphate acid is 35.5 grams.

0.5 m of NaOH denotes the amount of the solvent that is dissolved in 0.5 mole (20.0 g) of NaOH. 0.5 moles of NaOH (20.0 g) are dissolved in 1000 millilitres of the solution, or 0.5 M of NaOH.

Tetraoxosulphate VI acid is produced commercially using the Contact process. The Contact procedure entails the following steps. In order to purge the sulphur (IV) oxide generated of contaminants and dust that can poison the catalyst, it is combined with extra air and sent through an electric chamber.

Strong acid known as tetraoxosulphate may be used to produce synthetic colours, extract metals, serve as the electrolyte in lead-acid storage batteries, and produce synthetic and natural fibres.

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Complete question:

Calculate the mass of sodium tetraoxosulphate (vi) formed when 0.5 mole of sodium hydroxide react with tetraoxosulphate (vi) acid. (Na=23, O=16, S=32, H=1

Yes, it is possible to use the same colored central atom to make a model for all of these molecules. This is because the central atom in all of these molecules is the same, so it does not matter what color it is. The other atoms attached to the central atom will determine the shape of the molecule.

All the molecules have the same central atom because they are all hydrocarbons with the general formula CnH2n+2. The only difference between them is the number of carbon atoms that are present.For example, methane (CH4), ethane (C2H6), propane (C3H8), and butane (C4H10) are all hydrocarbons, and they all have Carbon as their central atom. The number of hydrogen atoms in each molecule varies based on the number of carbon atoms present.For instance, Methane (CH4) has one carbon atom and four hydrogen atoms, Ethane (C2H6) has two carbon atoms and six hydrogen atoms, Propane (C3H8) has three carbon atoms and eight hydrogen atoms, and Butane (C4H10) has four carbon atoms and ten hydrogen atoms. Therefore, you can use the same central atom, Carbon (C), to create a model for all of these molecules.

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Answer:

I am guessing you want to balence this

1,6,2,3

Fe2(CrO4)3 + 6LiNO3 -> 2Fe(NO3)3 + 3Li2CrO4

No, a gas can never have zero volume. Even if it has no pressure and the lowest possible temperature (-273.15°C), it will still occupy some space.

A gas is a state of matter that lacks a fixed shape and volume, meaning that it can change shape and occupy the entire volume of its container. Furthermore, its molecules are spaced out and move quickly, freely, and randomly in all directions.Gas law to support the hypothesis

As per Gay-Lussac's Law of Gases, there are no gases with zero volume. According to the law, when the volume of a gas is decreased at a constant temperature, its pressure increases proportionally. It implies that the gas molecules cannot be compressed into a zero-volume state. Even when subjected to the lowest possible temperature and pressure, the gas particles will still occupy some space.

The temperature of the gas would have to be reduced to absolute zero (-273.15°C), which is unattainable, to come close to zero volume.

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a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Which of the following atoms will bond with O in a 1:1 ratio of O and that element:

a) Lithium

b) Boron

c) Beryllium

d) Nitrogen

To solve the problem we have to look for the oxidation states of these elements.

Li: +1 B: +3 Be: +2 N: +5

These compounds will form an oxide with oxygen. The usual oxidation state of oxygen is -2. To form an oxide, we have to combine our element with oxygen and produce a compound with neutral charge.

For example, Li is +1, O is -2, so we have to combine 2 atoms of Li with one atom of O. The formula for the lithium oxide is Li₂O. Similarly we can form the other oxides. We will obtain:

Li₂O B₂O₃ BeO N₂O₅

If we look at the formulas of these oxides, the only one that will bond with O in a 1:1 ratio is Beryllium since its formula is BeO (it has one atom of O and one atom of Be).

Answer: c) Beryllium.

Plants can be defined as multicellular organisms that has the ability to manufacture or produce their own food.

The multicellular organisms are those organisms that are made up of various cells which work together to maintain the functionality of the living organism.

The plant can be described as a multicellular organism as it contains cells such as:

The plants are also has the ability to manufacture their own food due to the presence of the green pigment called the chloroplast.

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Answer:

In the process of baking bread, the chemical reaction happens because by consuming the sugar, the yeast has created new substances—carbon dioxide and ethanol.

Explanation:

Brainliest please! I am so close to getting my next ranking! I would really appreciate it, and it would make my day! Thank you so much, and have a wonderful rest of your day!

Answer:

The answer is 101.1032

Explanation: