Question 1
ming
2.04 g of Mg react with 12.3 g of O2
2Mg + O2 --> 2Mgo
How much MgO will be formed?

Answer:

The correct answer is 5 moles of CO2 are produced.

Explanation:

The given reaction:  

CH₄ (g) + 2O₂ (g) ⇔ CO₂ (g) + 2H₂O (g)

The given reaction is an illustration of a combustion reaction. Any reaction in which a substance is burnt in excess of oxygen to generate water and carbon dioxide is termed as a combustion reaction. From the given equation, it is clear that the moles of the formation of the products are in the ratio 1: 2, that is, if 10 moles of H₂O is produced, the production of 5 moles of CO₂ will be produced.  

Let us multiply, the given equation with 5 we get,  

5CH₄ + 10O₂ ⇔ 5CO₂ + 10H₂O

Hence, it is clear that with the formation of 10 moles of H₂O, formation of 5 moles of CO₂ will also take place.  

The there properties of organic compounds are

The standard deviation for Zn is 0.05528%, and for Sn is 0.000336%. The coefficients of variation are 0.1658% for Zn and 1.379% for Sn.

To calculate the standard deviation and coefficient of variation, we need to first find the mean and variance of the data.

For Zn;

Mean = (33.27 + 33.37 + 33.34) / 3 = 33.3267%

Variance = [(33.27 - 33.3267)² + (33.37 - 33.3267)² + (33.34 - 33.3267)²] / 2

= 0.00305627

For Sn;

Mean =(0.022 + 0.025 + 0.026) / 3

= 0.0243%

Variance = [(0.022 - 0.0243)² + (0.025 - 0.0243)² + (0.026 - 0.0243)²] / 2

= 1.13E-07

Now we calculate the standard deviation and coefficient of variation;

Standard deviation (Zn) = √(0.00305627)

= 0.05528%

Standard deviation (Sn) = √(1.13E-07)

= 0.000336%

Coefficient of variation (Zn) = (0.05528 / 33.3267) x 100%

= 0.1658%

Coefficient of variation (Sn) = (0.000336 / 0.0243) x 100%

= 1.379%

Therefore, the standard deviation for Zn and Sn is 0.05528% and 0.000336%. The coefficients of variation for Zn and Sn is  0.1658% and  1.379%.

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The pressure exerted by the neon gas, when the volume is increased from 7.2 mL to 28.8 mL at constant temperature, can be calculated using Boyle's Law. The pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

Boyle's Law states that at constant temperature, the product of the pressure and volume of a gas remains constant. Mathematically, it can be expressed as P₁V₁ = P₂V₂. This law allows us to calculate the change in pressure when the volume changes.

In this case, the initial volume (V₁) is given as 7.2 mL, and the initial pressure (P₁) is 1.5 atm. The final volume (V₂) is 28.8 mL. By substituting these values into Boyle's Law equation, we can solve for the final pressure (P₂).

When we perform the calculations, we find that the pressure exerted by the neon gas, when the volume is increased to 28.8 mL, is 0.375 atm. As the volume increases, the pressure decreases due to the inverse relationship between pressure and volume.

Using Boyle's Law: P₁V₁ = P₂V₂

Given:

Initial volume (V₁) = 7.2 mL

Initial pressure (P₁) = 1.5 atm

Final volume (V₂) = 28.8 mL

To find the final pressure (P₂):

P₂ = (P₁ * V₁) / V₂

  = (1.5 atm * 7.2 mL) / 28.8 mL

  = 0.375 atm

Therefore, the pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

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Answer:

No

Explanation:

The element calcium be found in more than one state of matter ( Only in Solid state )

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a. substituting in the expression of C(t) obtained in part a, we get,2500 = 12000/ (1 + 12000/ 5000 - 1) * e^(-2*3*t)  we get,t = 1/ (6 * log (2)) * log (5/3)≈ 0.276 h Therefore, it would take approximately 0.276 hours to reduce this concentration into C/2.

The differential equation for the indoor concentration of the given computer industry can be given as follows: dC/dt = P (0- C) - 2C²The above differential equation can be solved by the method of separating the variables as follows: dC/ (P (0- C) - 2C²) = dtIntegrating both sides, we get,-1/ [2P log (C/ (C- P0))] + (P0/ [P (C- P0)]) - (1/ (2C)) = t + c where c is the constant of integration. After simplification, the above equation can be expressed as:C(t) = P0/ (1 + (P0/ Co - 1) e^(-2Pt))The initial particle concentration Co is the value of C at t = 0. Hence, Ce = P0/ (1 + P0/ Co - 1) which can be simplified as Ce = Co/ (1 + P0/ Co - 1) = Co/P0b. Given that Co = 5000 cm³ and C/2 = 5000/2 = 2500 cm³,

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Answer:

Calculating the molar mass of each compound as well as the mass of the sodium in each compound will help us identify which compound has the highest mass percentage of sodium. After that, we can determine the salt content in mass.

Molar mass of NaCN = 49.0 g/mol

Mass of Na in NaCN = 23.0 g/mol

Percentage of Na by mass in NaCN = (23.0 g/mol / 49.0 g/mol) x 100% = 46.9%

Molar mass of NaN3 = 65.0 g/mol

Mass of Na in NaN3 = 23.0 g/mol

Percentage of Na by mass in NaN3 = (23.0 g/mol / 65.0 g/mol) x 100% = 35.4%

Molar mass of NaOH = 40.0 g/mol

Mass of Na in NaOH = 23.0 g/mol

Percentage of Na by mass in NaOH = (23.0 g/mol / 40.0 g/mol) x 100% = 57.5%

Molar mass of NaCl = 58.4 g/mol

Mass of Na in NaCl = 23.0 g/mol

Percentage of Na by mass in NaCl = (23.0 g/mol / 58.4 g/mol) x 100% = 39.4%

Therefore, NaOH contains the greatest percentage of sodium by mass, at 57.5%.

Based on the masses that react, we have 0.5 mol of \(NaOH\) and 0.185 mol of FeCl₃, which react to form 0.185 mol of Fe(OH)₃.

To calculate the amount (mol) of each compound based on the masses that react, you first need to use the given molar masses to convert the mass of each compound to moles. This can be done using the formula:

moles = mass (in grams) / molar mass (in grams/mol)

For example, if we have 20 grams of NaOH, we can calculate the number of moles as:

moles\(NaOH\) = 20 g / 40.00 g/mol = 0.5 mol

Similarly, if we have 30 grams of \(FeCl₃,\) we can calculate the number of moles as:

moles FeCl₃ = 30 g / 162.21 g/mol = 0.185 mol

Therefore, we have 0.5 mol of NaOH and 0.185 mol of FeCl₃ reacting with each other. The balanced chemical equation for the reaction is:

\(3 NaOH + FeCl₃ → Fe(OH)₃ + 3 NaCl\)

From the equation, we can see that 3 moles of NaOH react with 1 mole of FeCl₃ to produce 1 mole of Fe(OH)₃ and 3 moles of NaCl. Since we have excess NaOH in this case, we can use the amount of FeCl₃ to determine the limiting reactant and the amount of product formed.

Since we have 0.185 mol of FeCl₃ and it reacts with 3 moles of NaOH, the amount of NaOH required for complete reaction would be:

moles \(NaOH required = 0.185 mol FeCl₃ × (3 mol NaOH / 1 mol FeCl₃) = 0.555 mol\)

Since we have 0.5 mol of NaOH, it is the limiting reactant and only 0.185 mol of FeCl₃ will react to form the product. The amount of Fe(OH)₃ formed can be calculated as:

\(moles EditCopy equationRemove formed = 0.185 mol FeCl₃ × (1 mol Fe(OH)₃ / 1 mol FeCl₃) = 0.185 mol\)

Therefore, we have 0.5 mol of\(NaOH\)and 0.185 mol of FeCl₃, which react to form 0.185 mol of Fe(OH)₃.

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The final temperature of the gas is approximately 40.96 Kelvin.

To determine the final temperature of the gas, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, let's convert the given temperatures to Kelvin. We have:

Initial temperature: -125 degrees Celsius = 148 K (approximate)

Final temperature: Unknown

The initial conditions of the gas are as follows:

Initial pressure (P1) = 1.25 atm

Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)

Initial temperature (T1) = 148 K

The final conditions of the gas are as follows:

Final pressure (P2) = 50.0 atm

Final volume (V2) = 325 mL = 0.325 L

Final temperature (T2) = Unknown

Using the ideal gas law, we can set up the following equation:

(P1 * V1) / T1 = (P2 * V2) / T2

Substituting the known values:

(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2

Simplifying the equation:

T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)

T2 = 40.96 K

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Answer:

3.70 × 10³ g

Explanation:

To find the mass of the sample, multiply the volume by the density.

(55.1 cm³) × (6.72 g/cm³) = 3.70 × 10³ g

The mass of the sample will be 3.70 × 10³ g.

The term "density" refers to the mass of a material per unit volume. Density is defined by the equation d = M/V, where M stands for mass, and V for volume. Typically, density is measured in grammes per cubic centimetre.

As an illustration, water has a density of 1 gramme per cubic centimetre, whereas Earth has a density of 5.51 gramme per cubic centimetre. Kg/cubic metre is another method to express density (in metre-kilogram-second or SI units).

For instance, the air has a density of 1.2 kilogrammes per cubic metre. Textbooks and manuals provide lists of the densities of common solids, liquids, and gases. The mass of a body may be calculated from its volume using density, and vice versa. The mass is equal to the volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d).

By dividing the mass by the acceleration of gravity, one may get a body's weight, which is typical of more practical importance than its mass.

The mass of the sample can be obtained by multiplying the volume by the density.

(55.1 cm³) × (6.72 g/cm³) = 3.70 × 10³ g

Therefore, the mass will be 3.70 × 10³ g

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Answer:

9, 10, 12

Explanation:

anything greater than pH 7 is basic

Answer:

3 electrons

Explanation:

Nitrate needs 3 electrons to achieve a stable electron configuration

Three is the answer. it needs three to complete its shell

Answer:

ternary

Explanation:

A ternary ionic compound is a polyatomic ionic compound composed of three or more different elements.

An ionic compound is a chemical complex made up of ions that are held together through electrostatic forces. The molecule is essentially neutral, however, it contains positively charged cations as well as negatively charged anions.

An ionic compound with three components is known as a ternary ionic compound. One type of cation including one type of anion are still present in a typical ternary ionic combination. Polyatomic ions are cations, anion, or both.

Therefore, a ternary ionic compound is a polyatomic ionic compound composed of three or more different elements.

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A stiff metal bottle containing helium floats at the surface of the pond. If additional helium is added to that bottle, leaving its temperature and volume unchanged, the bottle will float because of the Archimedes principle.
This principle states that the buoyant force on a body is equal to the weight of the fluid displaced by the body. When a body is placed in a fluid, it experiences an upward force known as the buoyant force. If the buoyant force is greater than the weight of the body, the body will float.
In this case, the bottle containing helium floats on the surface of the pond because helium is less dense than air. Adding additional helium to the bottle will increase the volume of helium inside the bottle, but the temperature and volume of the bottle will remain the same. As a result, the buoyant force acting on the bottle will increase, making it float more easily on the surface of the pond.
However, it should be noted that the buoyant force acting on the bottle is also affected by the density of the fluid. If the density of the pond water increases, the buoyant force acting on the bottle will decrease, making it more difficult for the bottle to float. Therefore, the buoyancy of the bottle is determined by both the density of the fluid and the amount of helium in the bottle.

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The following assumptions are made:

1. Air behaves like an ideal gas throughout the process.

2. The initial pressure will be equal to the atmospheric pressure at sea level, 1atm.

3. The temperature remains constant.

Taking into account the above, we can apply the Boyle-Marriote Law that relates the change in pressure and volume at constant temperature. The equation tells us:

Where,

P1 is the initial pressure, 1atm

V1 is the initial volume, 5300L

P2 is the final pressure inside the air tank, this is our unknown

V2 is the final volume, this will be calculated using the volume equation for a sphere:

r is the radius of the sphere, 63.0cm/2=31.5cm

So, the volume of the air tank will be:

We clear P2 and replace the known data:

The air must be compressed at 40.5atm

Answer: 40.5

Answer:

Explanation:

pH is defined as the negative logarithm of the hydrogen ion concentration of a substance.

In order to find the pH we use the formula;

\( \bold{pH = -log([{H_3O}^{+}])} \)

From the question

\( [{H_3O}^{+}]\) = \( {1.7 \times 10}^{-3} \: M \)

We have

\( pH = -log({1.7 \times 10}^{-3}) \\ = 2.769555 \)

We have the final answer as

The chemical change among the given options is (d) Electrolysing water to produce hydrogen and oxygen.

In electrolysis, an electric current is passed through water, causing a chemical reaction to occur. During electrolysis of water, water molecules (H2O) are split into hydrogen gas (H2) and oxygen gas (O2) through the process of electrolysis.

This is a chemical change because the water molecules are undergoing a chemical transformation, breaking their molecular bonds and forming new substances (hydrogen and oxygen). The chemical composition of the water is changed as a result.

On the other hand, the other options listed are physical changes. (a) Melting of ice is a phase change from solid to liquid. (b) Boiling water is a phase change from liquid to gas. (c) Sublimation of solid ice directly to gaseous water is a phase change from solid to gas. (e) Heating water from 25°C to 60°C is an increase in temperature, but it does not involve any change in the chemical composition of water.

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The resulting value will be in joules (J), representing the amount of heat released during the dissolution of KNO3 in water.To calculate the heat released by the solution, we can use the equation Q = mcΔT, where Q is the heat released, m is the mass of the solution, c is the specific heat capacity of the solution, and ΔT is the change in temperature.

First, we need to calculate the mass of the solution. This can be done by adding the mass of water (275 g) to the mass of KNO3 (26.7 g), giving us a total mass of 301.7 g.

Next, we calculate the change in temperature by subtracting the final temperature (17.70 °C) from the initial temperature (23.00 °C), which gives us ΔT = -5.30 °C (note that the negative sign indicates a decrease in temperature).

Since the specific heat capacity of the resulting solution is assumed to be the same as water (4.184 J/(g·°C)), we can substitute the values into the equation Q = mcΔT. The mass (m) is 301.7 g, the specific heat capacity (c) is 4.184 J/(g·°C), and ΔT is -5.30 °C.

By plugging in these values, we can calculate the heat released by the solution. The resulting value will be in joules (J), representing the amount of heat released during the dissolution of KNO3 in water.

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The statement means that in every interaction, 9a b

Strong nucleophile, good leaving group, polar aprotic solvent, methyl or primary halide. The correct answer is option: b.

In an SN2 reaction, a nucleophile attacks the carbon atom to which the leaving group is attached, while the leaving group departs from the molecule. The reaction proceeds in a single step, with the nucleophile and leaving group involved in the transition state. A strong nucleophile is required to attack the carbon atom, and a good leaving group is necessary to depart from the molecule. Methyl or primary halides are preferred substrates because they are less hindered, making the attack by the nucleophile easier. Option b is correct.

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Answer:

sorry I do not know what is the answer I am just here to reach 1000 point I think you should understand.

When a gas at a given temperature and pressure is changed, the new volume of the gas can be calculated using the ideal gas law.

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Answer:

A. Water vapor from a factory smokestack

Answer:

get a little more than that is a great deal for the company and inventor of a company how can we get u a great job with their best friend in a few months but il will send you i will be the only person I know of fishes and the best I have to ask me to make it to my own home wifi and I am grade up to the same thing and the same way of the American people I have a lot to make a simple one person

The pH at the equivalence point of a weak base-strong acid titration can be determined using the Henderson-Hasselbalch equation.

In this case, the weak base is sodium hypochlorite (NaOCl), and the strong acid is hydrochloric acid (HCl). Given that 20.00 mL of NaOCl requires 28.30 mL of 0.50 M HCl, we can calculate the moles of HCl used. The balanced chemical equation for the reaction between NaOCl and HCl is: NaOCl + HCl → HClO + NaCl. Since the molar ratio between NaOCl and HCl is 1:1, the moles of HCl used is equal to the moles of NaOCl used. By dividing the moles of HCl used by the total volume of the NaOCl solution (20.00 mL), we can determine the concentration of HCl. Next, we can use the dissociation constant (Ka) of HClO (the conjugate acid of NaOCl) to calculate the concentration of HClO at the equivalence point. From the balanced chemical equation, we know that one mole of NaOCl reacts with one mole of HCl to form one mole of HClO. Therefore, the concentration of HClO is equal to the concentration of HCl at the equivalence point. Finally, using the Henderson-Hasselbalch equation, we can calculate the pH at the equivalence point by plugging in the values for the concentration of HClO and the Ka of HClO. It is important to note that in this specific case, the concentration of HClO will be very low due to the weak acid nature of HClO. Consequently, the pH at the equivalence point will be acidic.

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Answer:

wax, candlewick, and oxygen

Explanation:

The burning of the candle is both a physical as well as a chemical change. The reactants are the substances or the raw materials that are required for a reaction to the process. In the process of burning a candle, the reactants are the fuel which includes wax and wick, and oxygen which is found in the air. The products found at the end of the reaction are carbon dioxide and water vapor.

Answer:

a) 64.27%

b) 58%

c) ethanol is the limiting reactant

d) ethanol is the limiting reactant

Explanation:

We have to note that the expected yield is the theoretical yield while the actual mass or amount of product formed is the actual yield.

a) theoretical yield=68.3g

Actual yield= 43.9 g

Percentage yield= 43.9/68.3 ×100

Percentage yield= 64.27%

b) theoretical yield= 0.0722 moles

Actual yield = 0.0419

Percentage yield= 0.0419/0.0722 × 100

Percentage yield= 58%

c) note that the limiting reactant yields the least number of moles of product

Ethanol will be the limiting reactant since it is not present in excess.

d) from the reaction equation;

1 mole of acetic acid produces 1 mole of ethyl acetate

0.58 moles of ethanol produces 0.58 moles of ethyl acetate

1 mole of acetic acid yields 1 mole of ethyl acetate

Hence 0.82 moles of acetic acid yields 0.82 moles of ethyl acetate

Hence ethanol is the limiting reactant.

Answer:  I just try this  

The bright line spectra is a physical property of an element because it occurs in the physical appearance of an element.

A bright line spectrum is formed when a light beam passes through an analyte sample where some wavelengths of the light are absorbed by the atoms present in the sample which leads to attaining the excited state of the electrons in those atoms. As the excited electron returns to the ground state, the energy that was absorbed is released in the form of discrete lines of light. Spectral lines are formed by the transitions of electrons within atoms. As the electrons move closer to the nucleus or farther from the nucleus of an atom, energy in the form of light is emitted or absorbed. A continuous spectrum comprises lights of all wavelengths within a certain range whereas a line spectrum only consists of a few wavelengths.

So we can conclude that due to the occurrence in the physical appearance of an element, the bright line spectra are considered as a physical property of an element.

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