How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO3 (= 84.02 g/mol)?
HCl(aq) + NaHCO3(s) ? NaCl(s) + H2O(l) + CO2(g)
a. 175 mL
b. 536 mL
c. 276 mL
d. 572 mL
e. 638 mL

Answer: Atomic mass is associated with the number of neutrons and protons that are present in a particular nucleus of an element. Atomic number is usually the number of protons present in an element's nucleus

If you want to find the number of protons and electrons you look at the atomic number. If you want to find the number of neutrons you need to subtract the atomic number from the mass. If the mass have something like 35.453 the mass will be 35. But if it's like 10.811 the mass will be 11 because if the number after the decimal is five or higher then the number before the decimal will go up one.

Explanation:

Answer:

methylpropanoic is your answer

Answer:

A)Protons and electrons

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

when an atom lose or gain the electron ions are formed and number of protons and electrons no longer remain the same.

For example:

An atom of sodium when lose one electron it form positive ion. The number of electrons became 10 and number of protons remain 11.

Na → Na⁺ + 1e⁻

The total change in 2 years is likely to be -3 2/3mg/L.

Here given that ,

They discovered that the chloride concentration changed by -1 3/5 mg/L the first year.

The chloride concentration is expected to change in -2 1/15mg/L over the next year.

To determine: What is the total change that is likely to occur in two years?

To find the solution,

During the first year, the chloride concentration changed by -1 1/3

= -8/5mg/L.

The chloride concentration will change in -2 1/15 = -31/15 mg/L  over the next year.

The total change that is likely to occur in the next two years is

-8/5 + (-31/15)

= (-24 - 31 ) / 15

= -55/15

= -11/3

-3 2/3mg/L in a mixed fraction.

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The empirical formula for calcocite is Cu₂S.

Calcocite is a mineral composed of 79.9% copper and 20.1% sulfur.

The empirical formula of calcocite can be found by dividing the mass percentages of the elements by their atomic masses and then calculating the ratio of their subscripts in the smallest possible integer form.

The atomic masses of Cu and S are 63.546 and 32.066, respectively.

By using above formula - Cu: 79.9 / 63.546 = 1.257

S: 20.1 / 32.066 = 0.626

The smallest possible integer ratio between these two values is 2:1.

Therefore, the empirical formula for Calcocite is Cu₂S.

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Answer:

An important distinction between molality and molarity is the difference between a solution and a solvent. Molarity is the ratio of the moles of a solute to the total liters of a solution. ... Molality, on the other hand, is the ratio of the moles of a solute to the kilograms of a solvent.

The catalyst for the given reaction is \(I_{2}\)

In almost every facet of the chemical industry, catalysis is an essential process. According to some estimates, catalysts are used at some point during the production of around 90 percent of all chemical products sold in commercial settings. The word "catalyst" originates from the Greek word "katal," which may be translated as "to loosen" or "to untie."

In almost every facet of the chemical industry, catalysis is an essential process. According to some estimates, catalysts are used at some point during the production of around 90 percent of all chemical products sold in commercial settings.

The slower step of the reaction is CH3CHO+I2CH3I+CO+HI.

The given reaction is as follows:

Rate = k [CH3CHO] [I2] The reaction goes through a two-step mechanism.

The two steps of the reaction are:

CH3CHO+I2→CH3I+CO+HI CH3I+HI→CH4+I2

The catalyst of the given reaction is I2. The rate of decomposition of acetaldehyde into methane and CO in the presence of I2 at 800 K follows the rate law:

Rate = k[CH3CHO][I2]

The decomposition is believed to go by a two-step mechanism, that is, CH3CHO+I2CH3I+CO+HI and CH3I+HICH4+I2.

Out of these two steps, the slower one is CH3CHO+I2CH3I+CO+HI.

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In 9 M solution with a volume of 5000 mL there are 45 moles

To determine the number of moles in a solution, you need to know the volume of the solution and the molarity. The formula to calculate the number of moles is:

\(Number\ of\ moles = Molarity (M) * Volume (L)\)

Given:

\(Molarity (M) = 9 M\\Volume (V) = 5000 mL = 5000/1000 = 5 L\)

Now, we can calculate the number of moles (n) using the formula:

\(n = M * Vn = 9 M * 5 L\\n = 45 moles\)

Therefore, there are 45 moles in a 9 M solution with a volume of 5000 mL.

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Sucrose has the molecular  C₁₂H₂₂O₁₁ . if a sucrose sample contains 9.0x10²⁴ atoms of hydrogen, There are 1.4370 x10²⁶ molecules of sucrose are present in the sample.

Sucrose C₁₂H₂₂O₁₁ contain  C₁₂H₂₂O₁₁  Hydrogen

First we should how how many percentage of hydrogen in sucrose

The following formula will be used to determine the percentage of elements present in a molecule:

(Mass of Element / Mass of Molecule) / 100 equals the percentage of an element.

Sucrose's molecular weight is.

= (12)12 + (1)22 + (16)11, 

where 12 is the mass of an atom of carbon.

Hydrogen's atomic mass is 1, thus.

16 = Oxygen Atomic Mass

mass sucrose = 144 + 22 + 176

mass sucrose = 342 g/mol

% of H  =  (22 / 342) ×100    =  6.43 %

to calculate how many molecules sucrose are present we can compare percentage of hydrogen to % sucrose

 % hydrogen         =         % sucrose            

atom hydrogen           molecules of sucrose

6.43 %        =              100%              

9.0x10²⁴          molecules of sucrose    

molecules of sucrose    = 1.4370 x10²⁶ molecules

Therefore,  There are 1.4370 x10²⁶ molecules of sucrose are present in the sample.

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The 4-methyl pentane-2-ol (\(C_6H_{14}O\)) is an alcohol compound with a methyl group attached to the fourth carbon atom and a hydroxyl group attached to the second carbon atom in a five-carbon chain.

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Answer:

Bohr Model

Explanation:

The energy efficiency of converting corn into milk, considering the capture of 10 percent of the unused food energy from cows' gas released by manure, would be higher than without capturing the gas.

When corn is converted into milk, there is an inherent loss of energy at various stages of the process. However, if we consider capturing 10 percent of the food energy that is not utilized by cows and converting it into chemical energy from the gas released by their manure, the overall energy efficiency would improve. This captured energy can be harnessed and used for other purposes, thereby reducing wastage.

By capturing the gas released by manure, we are essentially tapping into a potential energy source that would otherwise be lost. This additional energy can be utilized to generate electricity, produce biogas, or even power machinery within the dairy farm. By incorporating this energy capture system, the overall energy efficiency of converting corn into milk would increase, as a portion of the previously wasted energy is now being utilized effectively.

This approach not only helps in improving the energy efficiency of milk production but also contributes to sustainability efforts by reducing greenhouse gas emissions. The captured gas can be used as a renewable energy source, reducing the dependency on non-renewable energy options.

In conclusion, by capturing 10 percent of the unused food energy from cows as chemical energy from gas released by manure, the energy efficiency of converting corn into milk would be higher than in traditional processes. This method allows for the effective utilization of otherwise wasted energy, leading to a more sustainable and efficient milk production process.

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The new volume of the container after the decrease in the former volume would be = 15.99L

The initial pressure in the container (P1) = 5.64 atm

The final pressure in the container (P2) = 9.17 atm

The initial volume of the container = 26.0 L

The final volume of the container = ?

to

Using Boyle's law formula;

P1V1 = P2V2

5.64 ×26.0 = 9.17 ×V2

make V2 the subject of formula;

V2 = 5.64×26/9.17

V2 = 146.64/9.17

V2 = 15.99L

Therefore, the new volume of the container is 15.99L which decreased due to increase in pressure.

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Answer:

273.6 g

Explanation:

mass =(density)(volume)

mass=(5.7g/cm^3 )(48 cm^3)

cancel out your cm^3 and your are left with grams

multiply (5.7g)(48)=273.6 g

The mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.

Density is defined as the degree to which a material is packed together.

It is also defined as a mass per unit volume of the substance.

Its SI unit is kilogram per cubic meter or  gram per meter.

Density can be expressed as

Density = mass / volume

Mass =  density x volume

As given, Density = 5.7 g/cm³

                Volume = 48 cm³

So, Mass =  5.7 g/cm³ x  48 cm³

               =  273.6 grams

Thus, the mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.

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45 ml of  0.100M NaOH is required to completely neutralize 15.00mL of 0.100M H₃PO₄.

A neutralization reaction is when an acid and a base react to shape water and salt and includes the aggregate of H+ ions and OH- ions to generate water. The neutralization of a robust acid and strong base has a pH same to 7.

Neutralization is a chemical reaction in which acid and a base react quantitatively with each different. In a response in water, neutralization results in there being no extra hydrogen or hydroxide ions present within the solution.

Given;

M₁ = 0.100M NaOH

valance factor n₁ = 1

V₁ = ?

M₂ = of 0.100M H3PO4

valance factor n₂ = 3

V₂ = 15.00mL

M₁n₁V₁ = M₂n₂V₂

V₁ = M₂n₂V₂/M₁n₁

    = 0.1 × 3 × 15 / 0.1 × 1

     = 45 ml

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2.56 x 10²² propane molecules must be burned with 6.82 grams of oxygen.

The following is the balanced equation for propane combustion:

\(C3H8 + O2 = 3CO2 + 4H2O\)

Hence, we require 5 oxygen molecules for every molecule of propane.

We must multiply the quantity of propane molecules by the ratio of oxygen molecules to propane molecules in order to determine how many oxygen molecules are needed to burn 2.56 x 1022 propane molecules.

\(O2\) to \(C3H8\) Ratio: 5:1

The necessary number of O2 molecules is (5/1) times 2.56, which equals 1.28 x 10²³.

So, using the molar mass of oxygen, we can convert the quantity of oxygen molecules to grams.

1 mole of \(O2\) = 32 g

1.28 x 10²³ molecules of O2 = (1.28 x 10²³/ 6.022 x 10²³) moles of O2

Mass of \(O2\) = (1.28 x 10²³/ 6.022 x 10²³) x 32 g.

Mass of \(O2\) = 6.82 grams.

Hence, 6.82 grams of \(O2\) are required to burn 2.56 x 10²² propane molecules.

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form the molar concentration of the Ca(OH)2 which is a base we can deduct the pOH

pOH=-lg[OH-]

[OH-]=8.8 x 10-4 M

pOH=4

pH=14-pOH

pH=10

-lg[H+]=10

[H+]=10^-10

The concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ is 5.68×10¯¹² M

The concentration of Hydrogen ion [H⁺] in a solution talks about the acidicity  the solution. Thus, we can obtain the concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ solution as illustrated below:

Data obtained from the question

Concentration of Ca(OH)₂ = 8.8×10¯⁴ M  

Concentration of Hydrogen ion [H⁺] =..?  

Determination of the concentration of Hydroxide ion [OH¯]

 Concentration of Ca(OH)₂ = 8.8×10¯⁴ M

Concentration of Hydroxide ion [OH¯] =?  

Ca(OH)₂ (aq)⇄Ca²⁺ (aq) + 2OH¯(aq)  

From the balanced equation above,  

1 mole Ca(OH)₂ produced 2 moles of OH¯.

Therefore, 8.8×10¯⁴ M Ca(OH)₂ will produce = 8.8×10¯⁴ × 2 = 1.76×10¯³ M

Thus, the Concentration of Hydroxide ion [OH¯] is 1.76×10¯³ M  

Determination of concentration of Hydrogen ion [H⁺].  Concentration of Hydroxide ion [OH¯] = 1.76×10¯³ M

\(H^{+} * OH^{-} = 1*10^{-14}\\H^{+} * 1.76^{-3} = 1*10^{-14}\)

Divide both side by 1.76×10¯³  

\(H^{+} = \frac{1*10^{-14} }{1.76*10^{-3}}\\\)

[H⁺] = 5.68×10¯¹² M  

Therefore, the concentration of Hydrogen ion [H⁺] in the solution is 5.68×10¯¹² M  

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in the lewis resonance structure for ammonium ion (nh4 ) in which the central n atom is singly bonded to each of the four h atoms on the n atom positive charge is present.

Ammonia is a colorless, intensely unpleasant gas with a pungent, choke-inducing smell. It readily dissolves in water to produce an ammonium hydroxide solution that can irritate the skin and burn. Ammonia gas is easily compressed and, when put under pressure, turns into a clear, colorless liquid.

The ammonia has normally three hydrogen attached to central nitrogen atom carrying lone pair. When fourth hydrogen attaches to the central atom positive charge appear on the central atom.

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Answer:

1.15 hours

Explanation:

If they are going 100 kilometers an hour, and they need to go 115 k, then do 115/100 which is 1.15 which is the time

Answer:

Density = mass /volume

Thus,

2.56÷0.820= 3.12195Kg/L

Answer:

Chlorine has atomic number 17. Its electronic configuration is 2, 8, 7. It is the second-lightest of the halogens, it appears between fluorine and bromine in the periodic table.

Answer:

III

Explanation:

From the periodic table, Chlorine(Cl) has 17 protons.

And when arranging the proton of elements each shell has a number protons it can take, i.e

2,8,8,8..........

The first shell can only take a maximum of 2 protons while the second shell upwards takes a maximum of 8 protons

Now we want to arrange Chlorine;

1st shell = 2

2nd shell = 8

2 + 8 = 10

17(no. of Chlorine protons) - 10

= 7

therefore,

3rd shell = 7

Therefore,

The electronic configuration of chlorine is

2,8,7

Answer:

125°C

Explanation:

125°C is the melting point degree for standard plastic.

Answer:

130 degrees Celsius (266 degrees Fahrenheit)

Explanation:

High-density and low-density polyethylenes -- HDPE and LDPE, or recyclables 2 and 4 -- melt at 130 degrees Celsius (266 degrees Fahrenheit) and 120 degrees Celsius (248 degrees Fahrenheit), respectively, according to Dynalab Corp.

because the industrial gas is very harmful for us it is made up chemical and toxic gases

Answer:

The usual culprit is burning coal.

Explanation:

This produces a lot of carbon dioxide as well as sulphur dioxide. Other industrial processes, and vehicle emissions, produce similar oxides unless they are 'scrubbed' out. They react with atmospheric moisture to produce acids like carbonic, sulphurous and nitrous acids. Which is then precipitated. It should be remembered that a volcanic eruption has this effect too.

Answer:

The nucleus is the atom's central core. while the  surrounding the nucleus is a cloud of electrons, which makes up most of the atom's volume.

Explanation:

its the center of an atom

Answer: The nucleus

Explanation: The nucleus is the atom's central core and contains more than 99.9 percent of its mass. Surrounding the nucleus is a cloud of electrons, which makes up most of the atom's volume .

Answer:

natural gas

Explanation:

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Antibodies against nicotinic acetylcholine receptors (nAChR), present at neuromuscular junction (NMJ), can affect function of junction by interfering with normal signaling between nerve and muscle.

Antibodies against nicotinic acetylcholine receptors (nAChR), which are present at neuromuscular junction (NMJ), can affect the function of junction by interfering with normal signaling between nerve and muscle.

At NMJ, the nerve terminal releases acetylcholine (ACh), which binds to nAChR on muscle cell membrane, leading to depolarization of muscle cell and muscle contraction. If antibodies bind to nAChR, they can block or reduce the number of available receptors for ACh, leading to decrease or even complete loss of the normal muscle response to nerve stimulation.

This can result in muscle weakness, fatigue, and even paralysis, depending on the severity of antibody binding and amount of functional nAChR remaining at the NMJ.

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The binding energy of a nucleus refers to the minimum energy required to separate the nucleus into its constituent nucleons. The binding energy per nucleon (BE/A) is a more useful quantity than the absolute binding energy (BE) since it takes into account the number of nucleons present.

The more tightly bound a nucleus is, the higher its binding energy per nucleon. The equation that determines the binding energy is given by the formula, E=Δmc² where E is the binding energy, Δm is the mass defect, and c is the speed of light. The mass defect is the difference between the actual mass of a nucleus and the sum of the masses of its individual protons and neutrons. The mass of antimony-121 is the sum of the masses of its constituent nucleons, given by: Mass of antimony-121 = (71 x 1.00783 u) + (50 x 1.00867 u) = 120.90380 u The actual mass of antimony-121 is 120.90380 u. Using the mass of each nucleon and the actual mass of antimony-121, the mass defect of the nucleus can be determined as follows: Mass defect (Δm) = [71(1.00783 u) + 50(1.00867 u)] - 120.90380 u= 0.1471 u The binding energy can then be calculated using the formula: E = Δmc²= (0.1471 u)(1.66054 x 10^-27 kg/u)(2.99792 x 10^8 m/s)^2= 2.539 x 10^-10 J/mol To convert this to kilojoules per mole, we can divide by 1000:2.539 x 10^-10 J/mol = 2.539 x 10^-13 kJ/mol Therefore, the binding energy of antimony-121 is 2.539 x 10^-13 kJ/mol.

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The molar mass of insulin is approximately 0.798 g/mol, calculated using the equation for osmotic pressure and the given values of mass and volume.

To calculate the molar mass of insulin, we can use the equation for osmotic pressure:

π = (n/V)RT

where π is the osmotic pressure, n is the number of moles of solute, V is the volume of the solution in liters, R is the ideal gas constant, and T is the temperature in Kelvin.

First, convert the given values to appropriate units:

25.0 mg = 0.025 g
5.00 mL = 0.005 L

Next, rearrange the equation to solve for n (number of moles):

n = (πV) / (RT)

Substituting the given values:

n = (15.5 mmHg * 0.005 L) / ((0.0821 L·atm/(mol·K)) * 298 K)

Calculate n:

n ≈ 0.0313 mol

Finally, divide the mass of insulin (0.025 g) by the number of moles (0.0313 mol) to find the molar mass:

Molar mass = 0.025 g / 0.0313 mol

Molar mass ≈ 0.798 g/mol

So, the molar mass of insulin is approximately 0.798 g/mol.


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Answer:

volume of box is 38.81 cm³.

Explanation:

Given data:

Width of box = 4.5 cm

Height of box = 5.750 cm

Length of box = 1.50 cm

Solution:

Formula:

Volume = length × height × width

by putting values,

V = 1.50 cm × 5.750 cm× 4.5 cm

V = 38.81 cm³

Thus, the volume of box is 38.81 cm³.