How many carbon and hydrogen atoms are in KNO3?​

Answer:

mass 1.25 Liters NH₃(gas) = 0.949 grams (3 sig-figs)

Explanation:

At STP (Standard Temperature-Pressure conditions => 0°C(=273K) and 1atm pressure,  1 mole any gas will occupy 22.4 Liters.

So, given 1.25 Liters ammonia gas at STP, convert to moles then multiply by formula wt. (17g/mole gives mass of NH₃.

moles NH₃(gas) = 1.25L NH₃(gas)/22.4L NH₄(gas)· NH₃(gas)mole⁻¹ = 0.0558 mole NH₃(gas).  

Converting to grams NH₃(gas) = 0.0558 mole NH₃(gas) x 17 g·mol⁻¹ = 0.949 grams NH₃(gas).

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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(a)  The mass percent of HCl in the solution is approximately 36.1%.

(b)  The molality of HCl in the solution is approximately 15.5 mol/kg.

(c)  The mole fraction of HCl in the solution is approximately 0.218.

(a) To calculate the mass percent of HCl, we need to determine the mass of HCl in a given volume of the solution.

Given: Concentration of HCl = 11.8 M

Density of the solution = 1.190 g/mL

First, we need to calculate the mass of the solution. Since density is mass per unit volume, the mass of 1 mL of the solution is 1.190 g.

Next, we need to calculate the mass of HCl in 1 mL of the solution. Since the concentration is given in moles per liter (M), and the molar mass of HCl is 36.46 g/mol, we can calculate the mass of HCl in 1 mL as follows:

Mass of HCl = concentration × volume × molar mass

          = 11.8 mol/L × 0.001 L × 36.46 g/mol

          = 0.430 g

Now, we can calculate the mass percent of HCl using the following formula:

Mass percent = (mass of solute ÷ mass of solution) × 100

           = (0.430 g ÷ 1.190 g) × 100

           ≈ 36.1%

(b) The molality of HCl is calculated by dividing the moles of solute (HCl) by the mass of the solvent (water) in kilograms.

Since the density of the solution is given as 1.190 g/mL, the mass of 1 mL of the solution is 1.190 g. However, we need to consider the density of the solvent (water) to calculate the mass of water in the solution.

Assuming the density of water is 1 g/mL, the mass of water in 1 mL of the solution is (1.190 g - 0.430 g) = 0.760 g.

To calculate the molality of HCl, we need to convert the mass of water to kilograms:

Mass of water (kg) = 0.760 g ÷ 1000 = 0.000760 kg

The molality (m) is calculated using the formula:

Molality = (moles of solute ÷ mass of solvent in kg)

        = (11.8 mol/L × 0.001 L) ÷ 0.000760 kg

        ≈ 15.5 mol/kg

(c) The mole fraction (X) of HCl is calculated by dividing the moles of HCl by the total moles of all components in the solution.

To calculate the mole fraction, we need to consider the volume of the solution and convert it to liters.

Given: Concentration of HCl = 11.8 M

Volume of the solution = 1 mL

Volume of the solution (L) = 1 mL ÷ 1000 = 0.001 L

To calculate the mole fraction of HCl, we need to calculate the moles of HCl and the moles of water (solvent) in the solution.

Moles of HCl = concentration × volume

            = 11.8 mol/L × 0.001 L

            = 0.0118 mol

Moles of water = mass of water ÷ molar mass of water

             = 0.760 g ÷ 18.015 g/mol (molar mass of water)

             = 0.0422 mol

Total moles in the solution = moles of HCl + moles of water

                           = 0.0118 mol + 0.0422 mol

                           = 0.054 mol

Mole fraction of HCl = moles of HCl ÷ total moles

                   = 0.0118 mol ÷ 0.054 mol

                   ≈ 0.218

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The correct option is, two in the first energy level, six in the second energy level.

Define model of atom.

An atom is a fundamental unit of matter that cannot be disassembled chemically.

Depending on the energy of the electron, the orbital shells that an atom's electrons are arranged in are located at various levels within the structure of the atom. The initial energy level, or electron shell nearest to the atom's nucleus, is where electrons with the lowest energy can be found.

The following formula determines the maximum number of electrons that can be discovered at a specific energy level;

The number of electron = 2 × n²

Where;

n = The number of the different energy level

Therefore;

In the first energy when n = 1, the maximum number of electrons is provided as follows;

The number of electron = 2 × 1² = 2 electrons

In the second energy when n = 2, the maximum number of electrons is provided as follows;

The number of electron = 2 × 2² = 8 electrons

We have 2 electrons in the first energy level and the remaining 6 electrons in the second energy level because there are only 8 electrons in the atom.

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The instantaneous rate of reaction at 17 minutes is approximately -0.178 mol dm⁻³

To find the instantaneous rate of reaction at 17 minutes, we can use the concept of differential calculus and estimate the slope of the tangent line at t=17 on the graph of rate versus time.

To do this, we can use the formula for the slope of a line

slope = (change in y) / (change in x)

In this case, the "y" values are the rates of reaction and the "x" values are the times. We want to find the slope at t=17, so we can choose two points that are very close to t=17, such as t=15 and t=20. Then, we can use these values to estimate the slope at t=17

slope = (rate at 20 min - rate at 15 min) / (20 min - 15 min)

slope = (0.135 - 0.223) / (20 - 15)

slope = -0.178

This slope represents the instantaneous rate of reaction at t=17. However, since it has a negative value, it means that the rate of reaction is decreasing at t=17.

Therefore, the instantaneous rate of reaction at 17 minutes is approximately -0.178 mol dm⁻³

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Answer:

b. cannot exist in optically active form

Explanation:

Stereochemistry is a branch of chemistry that involves the spatial arrangement of the atoms of molecules and studies how this affects the physical and chemical properties of such species.

The correct structure for (2R,3S)‑2,3‑dibromobutane can be seen in the image attached below. Since the compound is a meso compound due to the plane of symmetry. Thus, the compound is achiral. i.e. Compounds that are superimposable on its mirror image. The plane of symmetry is vertical inclined at 90°(i.e. perpendicular) to the page thus goes via the middle of the molecule.

Answer:

pH = -log[H+]

Where [H+] = Hydrogen ion concentration

In this case,

[H+] = 1 × 10^(-2) = 10^(-2)

log{10^(-2)} = -2

-log{10^(-2)} = -(-2) = 2

pH = -log{10^(-2)} = 2

and hi.!!!

Answer:

0.1

Explanation:

Hydrogen ion concentration can be calculated using the formula [H+] = 10^-pH

pH can be concentrated using ph = -log[H+]

let's calculate the initial pH before anything was added: pH = -log(1) = 0

it increased by 1 so the final pH is 1.

Now we'll find the [H+] of a solution with a pH of 1:

concentration = 10^(-1) = 0.1

Answer:

C

Explanation:

A Is false because physical properties can relate to any chemical substance.

B Is false because physical properties are apparent wether a chemical change has occurred or not.

C Is correct because physical properties can be observed without making a chemical change to the substance, chemical properties cause physical properties but a chemical change is not needed to observe a physical property.

D Physical properties describe compounds in all phases of matter.

Answer:

nah

Explanation:

The process used 4.86 moles of hydrogen gas to generate 3.24 moles of ammonia gas.

According to the balanced chemical equation, the stoichiometry of the reaction shows that 3 moles of hydrogen gas (H₂) react with 1 mole of nitrogen gas (N₂) to produce 2 moles of ammonia gas (NH₃).

So, for every 2 moles of NH₃ produced, we need 3 moles of H₂ consumed. Therefore, to determine the moles of H₂ consumed, set up a proportion:

3 moles H₂ / 2 moles NH₃ = x moles H₂ / 3.24 moles NH₃

where x is the number of moles of H₂ consumed.

Solving for x:

x = (3 moles H₂ / 2 moles NH₃) x (3.24 moles NH₃) = 4.86 moles H₂

Therefore, 4.86 moles of hydrogen gas were consumed in the reaction to produce 3.24 moles of ammonia gas.

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When a strong acid or base is added to water, the pH will change dramatically.

A strong acid is one that is completely dissociated or ionized in an aqueous solution. This means it gives off the greatest number of hydrogen ions or protons when placed in a solution. Examples of strong acid are HCl, HBr, H2SO4, HNO4. These acids when placed in water, produces greatest amount of hydrogen ions. The pH value changes drastically. Any that has very high concentration of hydrogen and ion is acidic.

Also when base is added to water, the pH of water will increase above 7 and become basic. The pH of water is 7, but when base is added to it increases above 7.

Base is any solution that is slippery to touch in water solution, changes color, react with acid to form salt and change red litmus paper to blue.

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Explanation:

The ion OH⁻ consists of one oxygen atom (O) and one hydrogen atom (H), with an overall charge of -1 due to the extra electron.

To determine the number of lone pairs of electrons on the oxygen atom, we need to know its valence electron configuration. Oxygen has 6 valence electrons, and in the OH⁻ ion, it has gained one extra electron to form a single covalent bond with the hydrogen atom.

To form this bond, the oxygen atom uses two of its valence electrons, leaving it with four valence electrons that are not involved in bonding. These four valence electrons are arranged in two lone pairs of electrons around the oxygen atom.

Therefore, there are two lone pairs of electrons on the oxygen atom in the OH⁻ ion. The hydrogen atom does not have any lone pairs of electrons.

Answer:

It must have sunlight and water and neutrants and be fertilized

Explanation:

Answer:

13 branches/tree

Explanation:

Step 1: Given data

Step 2: Calculate the total number of branches (b)

We will use the following expression.

b = l × b/l

b = 19565 leaves × 1 branch/35 leaves = 559 branch

Step 3: Calculate the number of branches per tree (b/t)

We will divide the total number of branches by the total number of trees.

559 branches/43 trees = 13 branches/tree

Explanation:

Stars aren't visible during the sunlit hours of daytime because the light-scattering properties of our atmosphere spread sunlight across the sky. Seeing the dim light of a distant star in the blanket of photons from our Sun becomes as difficult as spotting a single snowflake in a blizzard. (put in your own words this is from online)

The molar solubility of BaF2 in a solution containing 0.33 M KF(aq) is 4.4 × \(10^{-4}\) M

What is Solubility?

Solubility is a measure of the maximum amount of a substance that can dissolve in a given solvent at a specific temperature and pressure. In other words, it is the concentration of a solute in a saturated solution at a particular temperature and pressure.

To solve this problem, we need to write the balanced chemical equation for the dissolution of BaF2:

BaF2(s) ⇌ Ba2+(aq) + 2F-(aq)

And the solubility product expression (Ksp) for this reaction is:

Ksp = [Ba2+][F-]^2 = 1.8 ×\(10{-7}\)

We know that KF is a soluble salt, and in aqueous solution, it completely dissociates into K+ and F- ions:

KF(aq) → K+(aq) + F-(aq)

When KF is added to a solution containing BaF2, the F- ions will react with the Ba2+ ions from the BaF2 to form more BaF2. This process is described by the following equation:

BaF2(s) + KF(aq) ⇌ BaF2·KF(aq)

The equilibrium constant for this reaction can be written as:

K = [BaF2·KF(aq)]/[BaF2][KF(aq)]

Now, let's define the molar solubility of BaF2 as "x". Then, we can write the concentration of Ba2+ and F- ions in terms of "x":

[Ba2+] = x

[F-] = 2x

[K+] = 0.33 M

At equilibrium, the concentrations of Ba2+, F-, and K+ ions will satisfy the equation:

K = [Ba2+][F-]^2/[BaF2][KF(aq)]

Substituting the values we have into this equation:

1.4 × \(10^{-4}\) = x × \(2x^{2}\) / [(1 - x)(0.33)]

Solving for "x", we get:

x = 4.4 × \(10^{-4}\) M

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mL and cm³ have a 1 to 1 conversion, so we have:

But we don't have this option, so we will need to find another.

The other are in m³, so we can use the conversion from cm to m to get this:

So, we can apply this to what we have:

We have an option with 0.054m³, so the correc alternative is 0.054 m³.

Therefore, we need 6.0 × 1022 atoms of carbon to reach 12 g on the lab balance.

Carbon is an element found in nature that is essential for life on Earth. It is an abundant, non-metallic, and highly versatile element that is used in a variety of ways in many different fields. Carbon is found in all living organisms and is the basis of all life on Earth. It is also found in rocks, soil, and the atmosphere. Carbon is the fourth most abundant element in the universe and is the basis for organic compounds that form the basis of all living things. In industry, carbon is used to produce steel, glass, plastics, and many other materials. Carbon is also used in the manufacture of fuels and is a component of the chemical processes necessary for life. Carbon is also used in batteries, semiconductors, and solar cells.

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The substance begins to boil at 2750⁰C, the substance begins to melt at 1500⁰C, the temperature at which the substance is both a liquid and a gas at 2750⁰C, temperature is the substance both a solid and a liquid​ at 1500⁰C.

Heating curves are the graphical correlations between heat added to a substance. When viewed from a cooling perspective, ie. loss of heat, it is the cooling curve.

The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance, and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.

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Answer:

1) increase concentration

2) decrease the amount

3) decrease the concentration

4) it would increase

Explanation: edge 2021

Answer:

1) increase concentration

2) decrease the amount

3) decrease the concentration

4) it would increase

Explanation:

The energy required to heat 419.0mg of iron from 1.2 degree C to 15.1 degree C is 2.625 J. This is calculated from the expression of Specific heat capacity.

Heat capacity is a characteristic of an object that explains the amount of heat required to change its temperature by one degree. Heat Capacity has the units of energy per degree. Specific Heat Capacity is the amount of heat required to change the temperature of a mass unit of a substance by one degree. Specific heat is a common term for the specific heat capacity.

Q = m*c*dT

This is the equation for specific heat capacity. here, m is the mass of the sample, c is the specific heat, and ΔT is the temperature change.

Putting all the values we get,

m = 419 mg = 0.419 g of Iron

dT = 15.1 -1.2 = 13.9 °C

Q = 0.419*0.449*13.9 = 2.615 J

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The percent composition of each element's mass in LiClO3 is as follows:

Percent Composition of Li =7.68%,

Percent Composition of Cl = 33.7%,

Percent Composition of O =53.1%.

It is necessary to know the molar masses of the constituent parts. We have:

Molar Mass Li = 6.94 grams per mole

Molar Mass Cl = 30.45 grams per mole

Molar Mass O = 16 grams per mole

Molar Mass LiClO3 = 90.39 grams per mole

Percent Composition of Li:

Utilizing the molar masses of Li and the specified compound:

\(\% \mathrm{Li}=\frac{6.94 \frac{\mathrm{g}}{\mathrm{mol}}}{90.39 \frac{\mathrm{g}}{\mathrm{mol}}} \times 100\)

%Li =7.68%

Percent Composition of Cl:

Using the molar mass of Cl and the molar mass of the given compound

\(\% \mathrm{Cl}=\frac{30.45 \frac{\mathrm{g}}{\mathrm{mol}}}{90.39 \frac{\mathrm{g}}{\mathrm{mol}}} \times 100\)

%Cl = 33.7%

Percent Composition of O:

Utilizing the molar masses of O and the specified compound:

\(\% \mathrm{O}=\frac{3 \times 16 \frac{\mathrm{g}}{\mathrm{mol}}}{90.39 \frac{\mathrm{g}}{\mathrm{mol}}} \times 100\)

%O =53.1%

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Answer:

30.8 grams

Explanation:

n = 3.5 mol/L × 0.275 L = 0.9625 mol

The molar mass of CH3OH is 32 g/mol.

Therefore, the mass of CH3OH required is:

mass = n × molar mass

mass = 0.9625 mol × 32 g/mol = 30.8 g

Therefore, you need 30.8 grams of CH3OH to prepare a solution that is 3.5 M CH3OH in 275 mL of water.

The answer is:

C.(mitochondria)

I took the test, hope this helps!

Answer:

The waves travel in a direction parallel to direction of the vibration of the medium

The waves travel in a direction parallel to direction of the vibration of the medium

A mechanical wave is defined as an oscillation of matter which is responsible for energy transfer via  medium.

The propagation of  wave is limited by the medium of transmission, the oscillating material which revolve around a fixed point with little translational motion.

A surface wave which is an example of  mechanical wave that propagate  along the interface of two different media in physics. other common examples are Gravity waves on the surface of liquids, ocean waves.

Surface wave can be propagated in a slow way through Earth material and are generally lower in frequency than body waves.

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Answer:

1301.14 g

Explanation:

If an iron ore sample is 35.00% Fe by mass, it means that 100 g of the sample contains 35.00 g of Fe.

To calculate how many grams of ore are needed to obtain 454.0 g of Fe, we can use the proportion:

(g of ore) / (100 g of ore) = (454.0 g of Fe) / (35.00 g of Fe)

Solving for (g of ore), we get:

(g of ore) = (100 g of ore) x (454.0 g of Fe) / (35.00 g of Fe)

(g of ore) = 1301.14 g

Therefore, 1301.14 g of the iron ore sample is needed to obtain 454.0 g of Fe.

The number of positive charge units (protons) in the nucleus is defined as the atomic number, which is the single most significant property of an atom. Atomic numbers are typically represented by the symbol Z.

A component of an element is an atom. A specific element only has one kind of atom per atom. Protons, neutrons, and electrons, which are subatomic particles, make up the remainder of an atom. Chemical reactions can result in the combination of elements to create molecules. The number assigned to a chemical element by its atomic number in the periodic system places the elements in ascending order of the number of protons in their nuclei.

The number of positive charge units (protons) in the nucleus is defined as the atomic number, which is the single most significant property of an atom. Atomic numbers are typically represented by the symbol Z.

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The mass of the ammonia that is required is  258 g.

The quantitative correlations between the reactants and products in a chemical reaction are the focus of the chemistry subfield known as stoichiometry.

We have to know that;

1 mole of CO2 produces 1 mole of urea

2.2 moles of CO2 produces 2.2 urea

Given that the number of moles of urea = 455 g/60 g/mol

= 7.58 moles

Now;

2 moles of NH3 produces 1 mole of urea

x moles of NH3 produces 7.58 moles of urea

x = 7.58 * 2/1

= 15.16 moles

Mass of the ammonia =  15.16 moles * 17 g/mol

= 258 g

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