A student requires 2.00 L of 0.100 M NH4NO3 from a 1.75 M NH4NO3 stock solution. What is the correct way to get the solution?
Use M subscript i V subscript 1 equals M subscript f V subscript f..
Measure 114 mL of the 1.75 M solution, and dilute it to 1.00 L.
Measure 114 mL of the 1.75 M solution, and dilute it to 2.00 L.
Measure 8.75 mL of the 1.75 M solution, and dilute it to 2.00 L.
Measure 8.75 mL of the 0.100 M solution, and dilute it to 2.00 L.

The following balanced chemical equation may be used to describe the interaction between aluminum (Al) and calcium nitrate (Ca(NO₃)₂):

2 Al + 3 Ca(NO₃)₂ → 2 Al(NO₃)3 + 3 Ca

Reactants are the chemicals that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

The substances that initiate a chemical reaction. Products are the substances that are created during the reaction. Compounds or elements can act as reactants and products.

Aluminium and calcium nitrate interact in this reaction to form aluminium nitrate (Al(NO₃)₃) and calcium (Ca), which are the end products.

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Hello sir, The answer that you are looking for is fluorine. Fluorine is the most electronegative atom. I am also sorry for calling you sir. I didn't know you were a woman.

To calculate the molarity of vinegar, we need to know the moles of acetic acid (the main component of vinegar) and the volume of vinegar used.

The change in volume during the titration is:

Change in volume = Final volume - Initial volume

                = 33.5 mL - 12.3 mL

                = 21.2 mL

Assuming that the density of vinegar is approximately 1 g/mL, we can convert the change in volume to grams:

Change in volume (mL) × Density (g/mL) = Mass (g)

21.2 mL × 1 g/mL = 21.2 g

Next, we need to convert the mass of acetic acid to moles. The molar mass of acetic acid (CH3COOH) is approximately 60.05 g/mol:

Moles = Mass (g) / Molar mass (g/mol)

     = 21.2 g / 60.05 g/mol

     ≈ 0.353 mol

Finally, we calculate the molarity of vinegar using the moles and total volume:

Molarity = Moles / Total volume (L)

        = 0.353 mol / 0.0212 L

        ≈ 16.65 M

Therefore, based on the information provided, the molarity of vinegar is approximately 16.65 M.

This problem is providing information about a chemical reaction between sodium carbonate and hydrochloric acid. Thus, the mass of evolved carbon dioxide is required and found to be 0.0922 g according to:

In chemistry, stoichiometry is a tool that allows us to perform mole-mass calculations based on proportional factors involving the balanced chemical equation, molar masses and mole ratios. In such a way, for the reaction in this problem, we write:

\(2HCl+Na_2CO_3\rightarrow 2NaCl+H_2O+CO_2\)

In such a way, since both HCl and Na2CO3 are given, we calculate the grams of CO2 produced by each one, to identify the limiting reactant, according to the 2:1 and 1:1 mole ratios the reactants have with CO2 respectively:

\(0.2220gNa_2CO_3*\frac{1molNa_2CO_3}{106gNa_2CO_3} *\frac{1molCO_2}{1molNa_2CO_3}*\frac{44.01 gCO_2}{1molCO_2}= 0.0922gCO_2\\ \\ 0.1000L*0.0731\frac{molHCl}{L} *\frac{1molCO_2}{2molHCl}*\frac{44.01 gCO_2}{1molCO_2}=0.161gCO_2\)

Thus, since Na2CO3 produce the smallest amount of CO2, we infer it is the limiting reactant and therefore the correct produced amount is 0.0922 g.

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Answer:

C

Explanation:

Oxygen is required in combustion because it's plays a reactive role in the process.

4) According to the question, we are to determine which type of reaction are the given reaction by using the given reactions in the table.

The reaction between lead (II) hydroxide and hydrochloric acid to produce lead(II) chloride and water is an acid-base reaction that involves the reaction between an acid and base to produce salt and water

For the second reaction:

This reaction is a combustion reaction since it occurs under oxygen to produce carbon dioxide and water.

For the third reaction:

This is a double displacement reaction since it involves the reaction between two compounds to produce another two compounds.

For the fourth reaction given as:

This is a synthesis combination since two compounds react to form a single new compound

For the fifth reaction:

This is a hydrogenation reaction since it involves the addition of hydrogen to the given compound to produce a new compound.

The enthalpy change of steam reforming of methane is -953 kJ/mol.

The enthalpy change of a reaction is the amount of heat absorbed or evolved when a mole of a substance is formed from its reactants.

The enthalpy change of a reaction may have a positive or negative value.

When the enthalpy change of a reaction has a positive value, the reaction is endothermic, but when the enthalpy change of a reaction has a negative value, the reaction is exothermic.

The enthalpy change of steam reforming of methane is calculated from the equation of the reaction, ΔH°, as given below follows:

Equation of reaction: CH₄ (g) + 2 H₂O (g) ---> CO₂ (g) + 4H₂(g)

The enthalpy change, ΔH°, of the reaction is equal to the sum of the enthalpy of the intermediate reactions.

H₂(g) + 1/2O₂(g) → H₂O(g)  :ΔH₁° = -242 kJ/mol

2H₂(g) + C(s)→ CH₄ (g)   :ΔΗ₂° = -75 kJ/mol

C(s) + O₂(g) → CO₂(g)  :ΔΗ₃° = -394 kJ/mol

ΔH° = 2 × ΔH₁° + ΔΗ₂° + ΔΗ₃°

ΔH° = {2 × (-242) + (-75) + (-394)} kJ/mol

ΔH° = -953 kJ/mol

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Answer : 165 kj/mol

[2(-242 kJ/mol)] + [2(0 kJ/mol)] - [-75 kJ/mol] + [-394 kJ/mol] = 165 kJ/mol

1. Hg0------Hg+02 is a decomposition reaction

2.Ca+H20------Ca(OH)2+H2 is a combination reaction

3. KBr+ Cl2-----KCl+Br2 is a displacement reaction

please choose me as BRAINLIEST

There are 3.14805 moles of NaCl in 0.805 liters of 3.91 M solution of NaCl.

Sodium chloride, is a mineral substance that is a member of the broader group of substances known as ionic salts.

To calculate the total number of moles of solute in a solution, we use the formula: moles of solute = molarity x volume in liters

It is given the volume of the solution as 0.805 liters and the molarity as 3.91 M for NaCl.

moles of NaCl = 3.91 M x 0.805 L

moles of NaCl = 3.14805 moles

Therefore, there are 3.14805 moles of NaCl in 0.805 liters of a 3.91 M solution of NaCl.

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The balanced chemical equation for the double-replacement precipitation reaction between lead(II) nitrate and chromium(II) sulfate can be written as: Pb(NO3)2 + CrSO4 → PbSO4 + Cr(NO3)2

In this reaction, lead(II) nitrate and chromium(II) sulfate react to form lead(II) sulfate and chromium(II) nitrate. The lead sulfate is insoluble in water and precipitates out of the solution, while the chromium nitrate remains in the solution as a soluble salt.

Thus, the balanced chemical equation for the double-replacement precipitation reaction between lead(II) nitrate and chromium(II) sulfate can be written as:

Pb(NO3)2 + CrSO4 → PbSO4 + Cr(NO3)2

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The amount of heat transferred to the sample of sodium is 332,699.149.

The amount of heat absorbed or released by a substance can be calculated using the following formula;

Q = mc∆T

Where;

According to this question, 898.3g sample of sodium experiences a temperature change of +301.11 K. The specific heat capacity of sodium is 1.23 J/(g-K).

Q = 898.3 × 1.23 × 301.11

Q = 332,699.149 J

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Answer:

1.8 J/g·°C (2 sig.figs. per ΔT)

Explanation:

Given:

mass (m) = 78.9 grams

specific heat (c) = ?

Temp. Change (ΔT) = 109°C - 18°C = 91°C

Heat flow (q) = 13,240 Joules

q = m·c·ΔT => c = q/m·ΔT

∴c = 13,240J / 78.9g·91°C = 1.844 J/g·°C ≅ 1.8 J/g·°C (2 sig.figs. per ΔT)

Answer:yes

Explanation:

The required balanced chemical equation CH₄ + 2O₂ = CO₂ + 2H₂0

Combustion is a chemical reaction between a fuel and an oxidant that produces an oxidized product.

Usually, its a reaction between a hydrocarbon and oxygen to yield carbon dioxide, water, and heat.

Hydrocarbon + Oxygen = Carbon Dioxide + Water + Heat

Balanced chemical equation is CH₄ + 2O₂ = CO₂ + 2H₂0

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Answer:

That would be 4.17742995 * 10^13 :)

Explanation:

Answer:

the sun is the biggest source of visible (solar?) energy caused by the movement of waves of (electromagnetic?)

Not confident sry :(

Explanation:

Steel is produced from pig iron through a process known as steelmaking or iron and steel production.

The pig iron obtained from the blast furnace contains high amounts of carbon, impurities, and other elements. To convert pig iron into steel, the carbon content needs to be reduced to desired levels, and impurities must be removed.One common method of steelmaking is the basic oxygen process (BOP). In this process, pig iron is placed in a vessel called a converter, where oxygen is blown through the molten metal. The oxygen reacts with the carbon and impurities, causing them to oxidize and form gases that are released. Alloying elements and desired additives can be added at this stage to achieve specific steel properties. Another method is the electric arc furnace (EAF), where an electric arc is used to heat and melt the pig iron, allowing impurities to be oxidized and removed.The advantages of using steel are numerous. Steel is strong, durable, and versatile, making it suitable for a wide range of applications. It has high tensile strength, which means it can withstand heavy loads and pressures. Steel is also resistant to corrosion, making it ideal for construction, infrastructure, and transportation projects. It is a recyclable material, contributing to sustainability and reducing environmental impact. Additionally, steel can be fabricated into various shapes and sizes, allowing for customization and flexibility in design.References:

A. Ghosh and A. Chatterjee, Ironmaking and Steelmaking: Theory and Practice, PHI Learning, 2008.

R.H. Tupkary and V.R. Tupkary, An Introduction to Modern Iron Making, Khanna Publishers, 2010.

J.R. Davis, ed., ASM Specialty Handbook: Carbon and Alloy Steels, ASM International, 1995.

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Approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

To determine the total percent of energy that came from fuels emitting greenhouse gases, we need to consider the energy sources listed in the chart that are known to produce greenhouse gas emissions. In this case, those would be oil, natural gas, and coal.

From the chart, we see that the percentages for these three energy sources are:

Oil: 37.9%

Natural gas: 23%

Coal: Not specified

Although the percentage for coal is not mentioned in the given information, it is a known fact that coal combustion releases greenhouse gases, including carbon dioxide (CO2). Therefore, we can assume that coal is among the fuels emitting greenhouse gases.

Adding up the percentages for oil and natural gas, we have:

37.9% (oil) + 23% (natural gas) = 60.9%

Therefore, approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

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Answer: At a pressure of 15.613 atm a 5.32 mol \(Cl_{2}\) sample occupy 5.08 L at 181.59 K.

Explanation:

Given: Moles = 5.32 mol

Volume = 5.08 L

Temperature = 181.59 K

Formula used to calculate the pressure is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

\(PV = nRT\\P \times 5.08 L = 5.32 mol \times 0.0821 L atm/mol K \times 181.59 K\\P = \frac{5.32 mol \times 0.0821 L atm/mol K \times 181.59 K}{5.08 L}\\= 15.613 atm\)

Thus, we can conclude that at a pressure of 15.613 atm a 5.32 mol \(Cl_{2}\) sample occupy 5.08 L at 181.59 K.

Answer:

The velocity of sound in air is dependent on several factors, including temperature, pressure, and humidity. At a temperature of 38°C (100.4°F), the average velocity of sound in air is approximately 343 meters per second (m/s). However, it is important to note that this is just an approximation and the actual velocity can vary depending on the specific conditions. To get a more precise value, you may need to consider the effect of pressure, humidity, and other factors.

Answer:

demonely it was different

As combustion always result into the formation of water, the other type of reactions that may result into formation of water are Acid-Base Neutralization Reactions and Hydrogen and Oxygen Reaction.

Acid-Base Neutralization Reactions:

A neutralisation reaction is a chemical process in which an acid and a base combine to produce salt and water as the end products.

H⁺ ions and OH⁻ ions combine to generate water during a neutralisation reaction. Acid-base neutralisation is the most common type of neutralisation reaction.

Example: Formation of Sodium Chloride (Common Salt):

HCl + NaOH → NaCl + H₂O

Hydrogen and Oxygen Reaction:

Water vapour is created when hydrogen gas (H₂) and oxygen gas (O₂) are combined directly. This reaction produces a lot of heat and releases a lot of energy.

Example: 2 H₂ + O₂ → 2 H₂O

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When the moving car brakes to the stop the kinetic energy of car will be converted to the heat energy.

The mechanical brake will be applies to the friction force and it convert the kinetic energy of the car into the thermal energy that which then dissipates on atmosphere. The process of the braking will follow the principle of the conservation of the energy.

The conservation of the energy is the principle, that is expressed in its the most general form, and it is the first law of the thermodynamics. The first law of thermodynamics explains that "the energy of the universe remains the same."

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This question is incomplete, the complete question is :

A car in motion has kinetic energy. A moving car is suddenly stopped. Why does the car stop? Where did the energy go?

Answer:

B is the answer

We are in a spiral galaxy but as of late scientists believe we are in a barred-spiral galaxy.

Explanation:

Hope this helped.

A brainliest is always appreciated.

Milky way is a type of  barred-spiral galaxy.

A galaxy is defined as a system of stars, stellar remainings, interstellar gas, dust, dark matter, which are bound together by means of gravity.The word is derived from the Greek word which literally means 'milky',as a reference to the Milky Way galaxy which contains the Solar System.

Most of the mass which is present in a galaxy is present in the form of dark matter, out of which only a few percent of the mass

is visible. Supermassive black holes are a common characteristic which are present at the centres of galaxies.

Galaxies are categorized as per their morphology in the shape of elliptical, spiral, or irregular. Many are believed to have supermassive black holes which are present at their centers. The Milky Way's central black hole which is present , also known as Sagittarius A*, has a mass which is four million times greater than the Sun.

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Answer:

it indicates, how many atoms or ions of each type are combined in the simplest unit.

The activation energy of this reaction is approximately -13.770 J/mol.

1. To graphically determine the activation energy, we need to plot two points. The given data points are:

  Point 1: (1, -1.275)

  Point 2: (2, 0.379725)

2. The rise is the change in the y-coordinate between the two points:

  Rise = y2 - y1 = 0.379725 - (-1.275) = 1.654725

3. The run is the change in the x-coordinate between the two points:

  Run = x2 - x1 = 2 - 1 = 1

4. The slope of the line formed by these two points can be calculated using the formula:

  Slope = rise / run = 1.654725 / 1 = 1.654725

5. The activation energy (Ea) can be determined using the equation:

  Ea = -R * slope

 Here, R is the ideal gas constant, which is approximately 8.314 J/(mol·K).

6. Plugging in the values:

  Ea = -8.314 * 1.654725 = -13.770 J/mol

Note that the activation energy is negative because it represents the energy difference between the reactants and the transition state (higher energy) in an exothermic reaction.

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When electrons are filling energy levels, the lowest energy sublevels are occupied first. This is Hund's rule.

Hund's rules state that:

Every orbital in a sublevel has to be singularly occupied before any other orbital is able to be doubly occupied.

All of the electrons in single occupied orbitals have to have the same spin to maximize the total spin.

Answer:

Explanation:

1,2,4,

The equations that show combustion are equations A, B and D.

When we talk about combustion, the idea is that the substance would be burnt in oxygen. In other words, the combustion can be taken to be an oxidation reaction. It is an oxidation reaction in the sense that the oxidation number of the substance that is reacting with the oxygen would become increased.

When we look at the equations that we have, it is quite easy to pick out among the balanced reaction equations that are shown here the ones that has to do with the burning of the substance in oxygen and a consequent rise in the oxidation number.

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Answer:

69.7 mL ≅ 70 mL

Explanation:

The chemical reaction between hydrobromic acid (HBr) and lithium metal (Li) produces lithium bromide (LiBr) and hydrogen (H₂) according to the following equation:

2HBr(aq) + 2Li(s) → 2LiBr(aq) + H₂(g)

Thus, 2 moles of HBr reacts with 2 moles of Li. So, the stoichiometric ratio is 1:1 (1 mol HBr reacts with 1 mol Li).

We convert the mass of Li to moles by using the molar mass (MM) of LiBr:

MM(LiBr) = 6.9 g/mol + 79.9 g/mol = 86.8 g/mol

moles of Li(s) = mass/MM(LiBr) = 19.4 g/86.8 g/mol = 0.223 moles Li(s)

Now, we can divide the moles of Li into the molarity of the HBr solution to obtain the volume in liters wee need to add:

V = moles Li(s)/M = (0.223 mol)/(3.2 mol/L) = 0.0697 L

0.0697 L x 1000 mL/1 L = 69.7 mL ≅ 70 mL

Therefore, 70 mL of 3.2 M HBr are needed to entirely dissolve the metal.