87 electrons are found in an ion with Z = 89. Write its symbol.

The percent yield for the reaction of a sample of 0.49 g of carbon dioxide was obtained by heating 1.22 g of calcium carbonate is 92.4%

Given the mass of carbon dioxide ([tex]CO2[/tex]) = 0.49g

The mass of calcium carbonate ([tex]CaCO3[/tex]) = 1.22g

The reaction is as follows:

[tex]CaCO3(s) -- > CaO(s)+CO2(s)[/tex]

As we see 1 mole of CaCO3 is required to produce 1 mole of [tex]CO2[/tex]

The molar mass of calcium carbonate, = 100.09 g/mol.

The molar mass of given carbon dioxide = 44g

mass of [tex]CaCO3[/tex] used = number of moles x molar mass = 1 * 100 = 100g

Mass of [tex]CO2[/tex] produced = 1 * 44 = 44g

Here for 100g of [tex]CaCO3[/tex] 44g of [tex]CO2[/tex] is produced.

Then for 1.22g of [tex]CaCO3[/tex] = 44 * 1.22/100 = 0.53g of [tex]CO2[/tex] is produced.

But the actual yield of carbon dioxide is 0.49 g

The percent yield is calculated by dividing the actual yield by the theoretical yield and multiplying by 100.

percent yield = 0.49/0.53 * 100 = 92.4%

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Boyle's Law-

[tex]\:\:\:\:\:\:\:\:\:\:\:\star\:\sf \underline{ P_1 \: V_1=P_2 \: V_2}\\[/tex]

(Pressure is inversely proportional to the volume)

Where-

As per question, we are given that -

Now that we have all the required values and we are asked to find out volume which will be occupied if the pressure is adjusted to 80 KPa and the temperature remains unchanged. For that we can put the values and solve for the final volume of helium-

[tex]\:\:\:\:\:\:\:\:\:\:\:\star\:\sf \underline{ P_1 \: V_1=P_2 \: V_2}[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf 100 \times 160 = 80 \times V_2\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf V_2 = \dfrac{100 \times 160}{80}\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf V_2 =100\times \cancel{\dfrac{ 160}{80}}\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf V_2 = 100 \times 2\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf \underline{V_2 = 200 \:cm^3 }\\[/tex]

Sulfur dioxide decomposition's balanced chemical equation is 2 SO2(g) 2 S(s) + 3 O2 (g). 200.00 g of solid sulphur would result from 25.0 g of sulphur dioxide.

In order to compute the mass of oxygen that will react or the mass of 02 that will react with aluminium, multiply the molar mass of oxygen molecules, 0.69 mol two, by 32 g per mole. Hence, the answer is that 25 g of aluminium and 22.22 g of cobalt will react.

First, we must determine how many moles of sulphur dioxide are contained in 25.0 g:

Number of moles of SO2 = mass / molar mass

Number of moles of SO2 = 25.0 g / 64.06 g/mol (molar mass of SO2)

Number of moles of SO2 = 0.3904 mol

The number of moles of sulphur produced can then be calculated using the mole ratio between sulphur dioxide and sulphur:

Number of moles of S = 2 x number of moles of SO2

Number of moles of S = 2 x 0.3904 mol

Number of moles of S = 0.7808 mol

Lastly, we may convert the amount of moles to grammes using the molar mass of sulphur:

Mass of S = number of moles x molar mass

Mass of S = 0.7808 mol x 256.53 g/mol (molar mass of S8)

Mass of S = 200.00 g (rounded to two decimal places)

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Answer: To convert 350 miles per hour to meters per second, we need to use the following conversion factors:

1 mile = 1609.344 meters

1 hour = 3600 seconds

Therefore, we can write:

350 miles per hour = 350 miles / 1 hour × 1609.344 meters / 1 mile × 1 hour / 3600 seconds

Simplifying the expression, we get:

350 miles per hour = 155.65104 meters per second (rounded to six decimal places)

Therefore, 350 miles per hour is equivalent to 155.65104 meters per second (approximately).

Explanation:

The mass of the nitrogen gas that is found to be produced from the reaction equation is 22.4 g.

A balanced chemical equation is a representation of a chemical reaction using the formulas of the reactants and products, and the coefficients that represent the number of each species involved in the reaction.

The correct equation of the reaction is;

2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O

Number of moles of CuO consumed = 197g/80 g/mol

= 2.4 moles

Given that;

3 moles of CUO is consumed to give 1 moles of N2

2.4 moles of CUO will give 2.4 * 1/3

= 0.8 moles

Mass of N2 = 0.8 * 28 g/mol

= 22.4 g

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HBr has a dipole moment of 7.95debye and an interatomic spacing of 1.94 x 10-om.

HBr (a polar covalent molecule) has a dipole moment () of 0.851D (debye) and a percentage ionic character of 12.6%.

The size of the charge multiplied by the distance between the centres of the positive and negative charges yields a dipole moment. The Greek character " is used to represent it. It is measured in Debye units ('D'). 1 D = 3.33564 10-30 C.m, where C signifies Coulomb and m a metre.

It's 1018 statcoulomb-centimeters. Traditionally, the debye moment was defined as the dipole moment produced by two charges of opposing sign but equal magnitude of 1010 statcoulomb.

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Answer:

50.0moles

Explanation:

The balanced equation of the reaction is:

2NaOH + H2SO4____ Na2SO4 +2H2O

2moles of NaOH reacted with 1mole of H2SO4

x moles of NaOH will react with 25moles of H2SO4

2moles______1mole

xmoles______25

x=25×2

x=50moles of NaOH

The mass of butane needed to produce 67.5 g of carbon dioxide is 22.27 g.

The balanced chemical equation for the combustion of butane (C4H10) is:

2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

This equation shows that 2 moles of butane react with 13 moles of oxygen to produce 8 moles of carbon dioxide. The molar mass of butane is 58.12 g/mol, and the molar mass of carbon dioxide is 44.01 g/mol.

To calculate the mass of butane needed to produce 67.5 g of carbon dioxide, we can use the following steps:

Calculate the number of moles of carbon dioxide produced:

67.5 g CO2 x (1 mol CO2 / 44.01 g CO2) = 1.534 mol CO2

Use the mole ratio from the balanced chemical equation to find the number of moles of butane needed:

1.534 mol CO2 x (2 mol C4H10 / 8 mol CO2) = 0.3835 mol C4H10

Calculate the mass of butane needed:

0.3835 mol C4H10 x 58.12 g/mol = 22.27 g C4H10

Therefore, the mass of butane needed to produce 67.5 g of carbon dioxide is 22.27 g.

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Answer:

human error , random error .

Answer:

H20 oxygen 17 8 0 gyjhf I'd

Esterification is a chemical reaction between an alcohol and a carboxylic acid that results in the formation of an ester and a molecule of water.

Esterification  is an important class of organic reactions and is widely used in the synthesis of flavors, fragrances, and plastics. In this report, we will explore the fundamental principles and practical applications of esterification.

The experimental procedure involves the reaction between methanol and acetic acid to form methyl acetate and water. The reaction was carried out in a round-bottom flask equipped with a condenser and a thermometer. The reactants were mixed in stoichiometric amounts, and a small amount of sulfuric acid was added as a catalyst. The flask was heated using a hot plate and maintained at a constant temperature of 60°C.

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Answer:

The molecular formula of X = C4 h8 O

The longest wavelength of a photon that has enough energy to cause the photodissociation of the weakest bond in a peroxyacyl nitrate molecule is approximately 590 nm.

Given the weakest bond in Peroxyacyl nitrate is N-O bond.

The standard bond-dissociation energy of N-O = 201 kJ mol−1

Let the wavelength = l

We know that E = h c / λ, where E is the energy in joules, h is Planck's constant, c is the speed of light, and λ is the wavelength of photons

[tex]E = (6.626 * 10^{-34}) * (3 * 10^8) / \lambda[/tex]

λ =  [tex](6.626 * 10^{-34}) * (3 * 10^8)/201 kJ mol^{-1}[/tex]

λ = 590nm

In order for photodissociation to occur, the photon must have enough energy to break the N−O bond in the nitrate functional group of the molecule. All of the energy of the photon is efficiently used for the photodissociation.

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Assuming the volume of the tire remains constant, we can use the ideal gas law to determine the pressure of the tire at the higher temperature:

P1/T1 = P2/T2

where P1 is the initial pressure, T1 is the initial temperature, P2 is the final pressure (what we're trying to find), and T2 is the final temperature.

Converting the temperatures to Kelvin (as the ideal gas law requires temperatures in Kelvin), we have:

P1/T1 = P2/T2

P1 = 2.25 atm

T1 = 20 + 273.15 = 293.15 K

T2 = 45 + 273.15 = 318.15 K

Solving for P2, we get:

P2 = P1(T2/T1)

P2 = 2.25 atm (318.15 K / 293.15 K)

P2 = 2.44 atm (rounded to two significant figures)

Therefore, the pressure in your tires at 45°C would be approximately 2.44 atm.

According to the given statement the alpha particle's wavelength is 6.48×10⁻¹⁵ meters.

The positively charged alpha particles (α) are created when the nucleus of an atom's two protons as well as two neutrons join forces. Alpha particles are created by the radioactivity of the most dangerous radioactive elements, including uranium, radium, and polonium.

The de Broglie wavelength equation may be used to determine the alpha particle's wavelength:

λ = h / p

where p is the particle's momentum, h is its Planck constant (6.626 * 10⁻³⁴ J s), and is its wavelength.

The mass (m) and velocity (v) of an alpha particle may be used to compute its momentum:

p = m * v

Inputting the values provided yields:

p = (6.70×10⁻²⁷ kg) * (1.52×10⁷ m/s) = 1.02×10⁻¹⁹ kg m/s

Now we can determine the wavelength using this value:

λ = h / p = 6.626 x 10⁻³⁴ J s / 1.02×10⁻¹⁹ kg m/s

λ = 6.48 x 10⁻¹⁵ m

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The complete question is -

Calculate the wavelength of -

An alpha particle (6.70×10⁻²⁷ kg) moving at a speed of 1.52×10⁷ m/s (34000000 miles per hour). What is the m ?

The growth of coral on objects found at the bottom of the ocean is a physical change, not a chemical change.

This is because the coral is simply attaching itself to the surface of the object through a physical process, rather than changing the chemical composition of the object itself. The coral is able to attach itself to the surface due to physical forces such as adhesion, cohesion, and surface tension.

However, it is worth noting that over time, the growth of coral on an object can lead to chemical changes in the object as the coral secretes calcium carbonate, which can gradually alter the object's composition.

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As HF is hydrogen bonded, it has a highest boiling point of 19 oC or less, when it becomes liquid. The boiling points of the remaining hydrogen halides, which are gaseous, are determined by the van der Waal forces.

Hydrogen fluoride (H 2 F) has a lower boiling point than water (H 2 O) ( ). H2O has a boiling point of 100 °C while only having a boiling point of 5 °C. Despite the fact that water and hydrogen fluoride have stronger hydrogen bonds than each other, water only forms two hydrogen bonds per molecule whereas hydrogen fluoride only forms one.

Furthermore, water creates hydrogen bonds between nearby molecules. The extremely electronegative oxygen on the other molecule interacts with hydrogen. This is a strong type of interaction that takes more energy than dipole-dipole interactions. As a result, water boils at a greater temperature than HCL.

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0.21 moles of S[tex]O_{2[/tex] can be produced by reacting 8 grams of C[tex]S_{2[/tex]

What is Moles?

Mole is a unit of measurement used in chemistry to express the amount of a substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in 12 grams of carbon-12. This number is known as Avogadro's number

To calculate the number of moles of S[tex]O_{2[/tex] produced, we need to use the balanced chemical equation to determine the mole ratio between C[tex]S_{2[/tex]and S[tex]O_{2[/tex].

The balanced chemical equation is:

C[tex]S_{2[/tex] + 3[tex]O_{2[/tex]→ C[tex]O_{2[/tex] + 2S[tex]O_{2[/tex]

The molar mass of C[tex]S_{2[/tex] is 76.14 g/mol.

First, we need to calculate the number of moles of C[tex]S_{2[/tex] present in 8 grams:

moles of C[tex]S_{2[/tex] = mass / molar mass

moles of C[tex]S_{2[/tex] = 8 g / 76.14 g/mol

moles of C[tex]S_{2[/tex] = 0.105 moles

From the balanced equation, we see that the mole ratio between C[tex]S_{2[/tex]and S[tex]O_{2[/tex] is 1:2. This means that for every 1 mole of C[tex]S_{2[/tex] that reacts, 2 moles of S[tex]O_{2[/tex] are produced.

Therefore, the number of moles of S[tex]O_{2[/tex] produced can be calculated as:

moles of S[tex]O_{2[/tex] = moles of C[tex]S_{2[/tex] × 2

moles of S[tex]O_{2[/tex] = 0.105 moles × 2

moles of S[tex]O_{2[/tex] = 0.21 moles

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The molarity of the bleach solution is 0.0635 M.

First we need to know the number of moles of solute (in this case, NaOCI) and the volume of the solution in liters.

First, we need to convert the mass of NaOCI to moles using its molar mass:

molar mass of NaOCI = 23.0 g/mol (for Na) + 16.0 g/mol (for O) + 35.5 g/mol (for Cl) + 1.0 g/mol (for I) = 74.5 g/mol

moles of NaOCI = mass / molar mass = 9.50 g / 74.5 g/mol = 0.127 moles

Next, we need to convert the volume of the solution to liters:

volume = 2,000 ml = 2,000 / 1,000 L = 2.0 L

Now we can calculate the molarity of the solution:

Molarity (M) = moles of solute / volume of solution in liters

M = 0.127 moles / 2.0 L = 0.0635 M

Therefore, the molarity of the bleach solution is 0.0635 M.

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The ideal gas law can be used to solve this issue:

PV = nRT

where R is the universal gas constant, n is the number of moles, P is the gas's pressure, V is its volume, and T is its temperature.

The following expression can be used to link the starting and final volumes and moles under the assumption that the gas's pressure and temperature don't change:

V1 / n1 = V2 / n2

where V1 and n1 represent the volume and number of moles at the beginning, and V2 and n2 represent the volume and number of moles at the end.

Inputting the specified values results in:

15 L/n2 = 3 L / 3 mol

When we simplify and account for n2, we obtain:

n2 = 3 mol (15 L / 3 L)

n2 = 15

As a result, 15 mol of the gas are present when the volume is changed to 15 L.

Using the equation V = nV m, where V is the volume in liters, n is the amount of gas in moles, and V m is the molar gas volume in liters per mole, is another technique to determine the solution. We may substitute the volume and molar gas volume from the question into this equation.

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The molarity of a 0.5 liter solution that contains 3.84 moles of NaCl would be 7.68 M.

Molarity is simply the ratio of the number of moles of solutes per liter volume of a solution.

In other words, molarity is a measure of the concentration of a solute in a solution. It is commonly denoted by the symbol "M" and expressed in units of mol/L.

Molarity = mole/volume

Where the volume is in liters.

In this case:

Molarity of the NaCl solution = 3.84/0.5

                                                = 7.68 M

Thus, the molarity of a 0.5 Liter solution that contains 3.84 moles of NaCI is 7.68 M.

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Answer:

Explanation:

We can use to convert the given number of atoms of nickel to moles.

1 mole of any element contains 6.022 x 10^23 atoms of the element

So, the number of moles of nickel can be calculated as:

moles of Ni = (number of atoms

moles of Ni = 3.88 x 10^23 / 6.022 x 10^23

moles of Ni = 0.644

Therefore, the answer is option B: 0.644 moles Ni.

The metal has a density of 19.3g/mL.

A material's density is determined by how much mass there is in a given volume of that material. We must divide the metal's mass by its volume to determine its density. Density of gold is 19.3 g/mL.Since the volume of the metal is equal to the volume of water it displaced, we can calculate the density of the metal by dividing the mass of the metal (352.3 grams) by the volume of water it displaced (18.0 mL).

Density = [tex]\frac{Mass}{Volume}[/tex]

Density = [tex]\frac{352.3 g}{18.0 mL}[/tex]

Density = 19.3 g/mL

Therefore, the density of the metal is 19.3 g/mL.

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complete question:

She measured the mass of the metal to be 352.3 grams. Then she dropped the metal into a measuring cup and found that it displaced 18.0 mL of water

calculate the density  of metal

densities of some common substances for comparison

Density of water = 1.00 g/mL

Density of air = 1.225 g/mL

Density of iron = 7.86 g/mL

Density of aluminum = 2.7 g/mL

Density of gold = 19.3 g/mL

we need to mix 3.68 g of Na2HPO4 and 2.89 g of NaH2PO4 to prepare 1.00 L of a buffer with a total phosphate concentration of 0.0500 M and a pH of 7.45.

pH = pKa + log([base]/[acid])

Substituting the values:

7.45 = 7.20 + log([Na2HPO4]/[NaH2PO4])

0.25 = log([Na2HPO4]/[NaH2PO4])

Antilog(0.25) = [Na2HPO4]/[NaH2PO4]

1.78 = [Na2HPO4]/[NaH2PO4]

Let x be the amount of Na2HPO4 in moles and y be the amount of NaH2PO4 in moles.

Then:

x + y = 0.0500 (total moles of phosphate)

141.96x + 119.98y = (0.0500)(141.96 + 119.98) (total mass of phosphate)

Solving these equations simultaneously, we get:

x = 0.0259 mol

y = 0.0241 mol

Mass of Na2HPO4 = 0.0259 mol × 141.96 g/mol = 3.68 g

Mass of NaH2PO4 = 0.0241 mol × 119.98 g/mol = 2.89 g

Concentration in chemistry refers to the amount of a substance dissolved in a given volume of a solvent. It is a fundamental concept in chemistry and is used to describe the strength of a solution. The concentration of a solution is usually expressed in terms of the amount of solute present per unit volume of the solution. There are several ways to express concentration, including molarity, molality, mole fraction, and percent by mass or volume.

Molarity is the most commonly used unit of concentration and is defined as the number of moles of solute per liter of solution.  The concentration of a solution plays an important role in determining its properties and behavior. For example, a highly concentrated solution of salt will have a higher boiling point and lower freezing point than a dilute solution. Concentration also affects the rate of chemical reactions, as higher concentrations of reactants typically result in faster reaction rates.

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Answer: As the fertilizers enter the water systems, they cause an explosion of growth by algae and aquatic plants. When the organisms die they are decomposed by microbes that quickly deplete the oxygen in water, killing animals such as fish and shellfish.

Explanation: Excess fertilizers lead to "eutrophication".

The condensed structural formula of the compound is;

(CH3)3CCH2CH(CH2CH3)CH2CH2CH(CH3)(CH2CH3)

The functional groups in norethynodrel are;  ketone, alcohol and alkyne

The condensed structure of an organic compound is a simplified representation of the molecular structure of the compound that uses brackets and symbols to indicate the arrangement of atoms in the molecule.

In a condensed structure, the individual atoms are not explicitly shown, and the bonds between them are indicated by lines.

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The pH of the solution is equal to the pKa of the acid when the concentrations of the conjugate acid and base are equal.

The Henderson-Hasselbalch equation is given by:

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

Where:

pH = the pH of the solution

pKa = the acid dissociation constant of the acid

[A-] = the concentration of the conjugate base

[HA] = the concentration of the acid

When the concentrations of the conjugate acid and base are equal, [A-] = [HA], and the Henderson-Hasselbalch equation can be simplified to:

pH = pKa + log(1)

log(1) = 0, so:

pH = pKa

Therefore, when the concentrations of the conjugate acid and base are equal, the pH of the solution is equal to the pKa of the acid. This can be used to determine the acid dissociation constant (Ka) of the acid by measuring the pH of the solution when the concentrations of the conjugate acid and base are equal.

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