calculate the enthalpy of combustion (kj/mol) of ethyl stearate (c₂₀h₄₀o₂) an important component of many biodiesel fuels made from soybean oil and ethanol, given the following standard enthalpies of formation:
CO2(g) = -393.5 kJ/mol
H.O(l) = -285.8 kJ/mol
c₂₀h₄₀o₂(I) = -984.6 kJ/mol 7

The approximate temperature of the H₂O after thermal equilibrium was reached is 23.4°C (option d).

The amount of heat absorbed by the water is given as 300.0 J. The mass of water is 50.0 g and the specific heat capacity of water is 4.2 J/g°C. Let's use the equation:

Q = m * c * ΔT

where Q is the heat absorbed, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.

Substituting the given values, we get:

300.0 J = 50.0 g * 4.2 J/g°C * ΔT

Solving for ΔT, we get:

ΔT = 300.0 J / (50.0 g * 4.2 J/g°C) = 1.43°C

The final temperature of the water can be calculated by adding the change in temperature to the initial temperature:

Final temperature = 22.0°C + 1.43°C ≈ 23.4°C

Therefore, the approximate temperature of the H₂O after thermal equilibrium was reached is 23.4°C (option d).

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Answer:

Steps of the technological design process include: identify a problem, research the problem, generate possible solutions, select the best solution, create a model, test the model, refine and retest the model as needed, and communicate the final solution.

Explanation:

hope it helps, please mark brainliest

Steps of the technology design process include: identify a problem, research the problem, generate possible solutions, select the best solution, create a model, test the model, refine and retest the model as needed, and communicate the final solution.

Technology is the application of knowledge for achieving practical goals in a reproducible way.The word technology can also mean the products resulting from such efforts, including both tangible tools such as utensils or machines, and intangible ones such as software. Technology plays a critical role in science, engineering, and everyday life.

Technological advancements have led to significant changes in society. The earliest known technology is the stone tool, used during prehistoric times, followed by the control of fire, which contributed to the growth of the human brain and the development of language during the Ice Age. The invention of the wheel in the Bronze Age allowed greater travel and the creation of more complex machines. More recent technological inventions, including the printing press, telephone, and the Internet, have lowered barriers to communication and ushered in the knowledge economy.

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Answer:

hfjdjdjdjdjdjdjd

Explanation:

rjeiejejejeje

Answer:

There are 2.99 moles or 3 moles of Sulfur in 96 grams

Explanation:

You divide 96 by the atomic weight of Sulfur which is 32.065. For every 32.065 grams of Sulfur you will get 1 mole of Sulfur. The answer should be 2.99 or 3 moles of Sulfur.

Answer:

\(\huge{\textbf{\textsf{{\color{skyblue}{An}}{\blue{sw}}{\red{er}}{\color{red}{:}}}}}\)

10 times 10

\(10 \times 10 \\ = 100\)

100 is the correct answer.

Answer:

\({\boxed{\boxed{\tt { ⎆ Answer :- }}}} \ \)

⏩ \(10 \: \: times \: \: 10 \\ = 10 \times 10 \\ = 100\)

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\( GuMiHo \) ❦

The BLU-91/B submunitions are typically used against armored or fortified targets such as tanks, bunkers, or buildings. These submunitions are designed to penetrate thick armor and cause significant damage to the target.

The BLU-91/B is a cluster bomb that contains a number of individual explosives submunitions that are released in mid-air and spread over a wide area. Each submunition is equipped with a shaped charge that is capable of penetrating even heavily reinforced targets. Overall, the BLU-91/B is a highly effective weapon that is used to take out heavily defended enemy positions.

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The correct responses for where igneous rocks form are B. Igneous rocks form underneath Earth’s surface where magma cools down within the crust, and C.Option b is correct.

Igneous rocks form within Earth’s mantle where magma is typically found.Option A, "Igneous rocks form on Earth’s surface where magma reaches the surface," is incorrect. Rocks formed from magma that reaches the surface are called extrusive or volcanic igneous rocks.

Option D, "Igneous rocks form in Earth’s inner core where magma solidifies under heat and pressure," is also incorrect. The Earth's inner core is composed mainly of solid iron and nickel, and it is not the location where igneous rocks form.

Igneous rocks are formed when molten magma cools and solidifies. This process primarily occurs within the Earth's crust and mantle. Intrusive or plutonic igneous rocks are formed when magma cools slowly beneath the Earth's surface, while extrusive or volcanic igneous rocks are formed when magma reaches the surface and cools quickly.Option b is correct.

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Answer:no answer

Explanation:

Temperature. Usually reactions speed up with increasing temperature. Physical state of reactants. Powders react faster than blocks - greater surface area and since the reaction occurs at the surface we get a faster rate.

The concentration of iron (III) ions in the solution is 0.0705 M.

To determine the concentration of iron (III) ions in the solution, we need to use the stoichiometry of the reaction between sodium sulfide (Na2S) and iron (III) nitrate (Fe(NO3)3) and the volumes and concentrations of the reactants.

The balanced equation for the reaction is:

2 Na2S + 3 Fe(NO3)3 → 6 NaNO3 + Fe2S3

From the equation:

2 moles of sodium sulfide react with 3 moles of iron (III) nitrate to form 1 mole of iron (III) sulfide.

2 moles Na2S + 3 moles Fe(NO3)3 = 1 mole Fe2S3

First, let's calculate the number of moles of sodium sulfide and iron (III) nitrate used in the reaction:

Moles of sodium sulfide = volume (in L) × concentration

                       = 0.022 L × 0.34 mol/L

                       = 0.00748 mol

Moles of iron (III) nitrate = volume (in L) × concentration

                         = 0.053 L × 0.22 mol/L

                         = 0.01166 mol

From the stoichiometry of the reaction, we can see that the mole ratio of sodium sulfide to iron (III) nitrate is 2:3. Therefore, the limiting reagent is sodium sulfide because there are fewer moles of sodium sulfide compared to iron (III) nitrate.

Since 2 moles of sodium sulfide react with 1 mole of iron (III) sulfide, we can calculate the moles of iron (III) sulfide formed:

Moles of iron (III) sulfide = (0.00748 mol Na2S) × (1 mol Fe2S3 / 2 mol Na2S)

                          = 0.00374 mol

Finally, we can determine the concentration of iron (III) ions (Fe3+) in the solution. Since 1 mole of iron (III) sulfide corresponds to 3 moles of Fe3+ ions, the concentration is:

Concentration of Fe3+ = moles of Fe3+ / volume (in L)

                     = (0.00374 mol) / (0.053 L)

                     = 0.0705 M

Therefore, the concentration of iron (III) ions in the solution is 0.0705 M.

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Answer:

the pressure of a gas is directly proportional to its volume.

Explanation:

Robert Boyle was an Irish chemist and is famously referred to as the first modern chemist. He was born on the 25th of January, 1627 in Lismore, Ireland and died on the 31st, December 1691, London, United Kingdom.

Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyles law is given by;

\( PV = K\)

\( P_{1}V_{1} = P_{2}V_{2} \)

Where;

P1 is the original pressure.

P2 is the final pressure.

V1 is the original volume.

V2 is the final volume.

This ultimately implies that, ventilation which is typically governed by Boyle's Law, which states that at a constant temperature the pressure of a gas is directly proportional to its volume.

Gallon of gasoline are needed for dr meyer to drive the 48km distance between salem and portland is 1.151 gallon.

Now,

According to the given question,

Fuel efficiency of dr. meyer's old car is 11km per liter.

According to dimensional analysis,

 11 km = 1 liter

  1 km = 1/11 liter

  48km = 48/11 liter

            =  4.36 liter

Now,

  We know that,

1 liter = 0.264 gallon

Hence,

 4.36 liter = 1.151 gallon

Thus, from the above conclusion we can say that,  Gallon of gasoline are needed for dr meyer to drive the 48km distance between salem and portland is 1.151 gallon.

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If your solid camphor product has a melting point slightly lower than you expect, you can conclude that the product may be impure or contain some contaminants.

The melting point of a substance is a physical property that can be used to determine its purity. Pure substances generally have a specific and well-defined melting point.

However, when impurities or contaminants are present, the melting point may be altered. In the case of your camphor product, a lower melting point indicates that there could be impurities mixed with the camphor, which are affecting its melting behavior.
A lower melting point than expected for your solid camphor product suggests that it might not be completely pure, and it likely contains some impurities or contaminants.

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Answer:

The second company job of $18 /hr is the better deal

Explanation:

We are told that;

-First job offers a salary of $30,000/yr

-Second job offers a salary of $18/hr.

Now, let's convert the salary of the second job to amount per year.

We are told that full-time work is 49hr/wk, 52 wk/yr.

Since we have 49 hrs in a week, then amount per week = 18 × 49 = $882 per week

Then amount per year = 882 × 52 = $45864 /yr

Thus, the second job pays $45864 /yr.

This is more than the first job. Thus, the second job is the better deal

Answer:

The different sounds

Explanation:

since it can not be changed

Answer:

B

Explanation:

Chemistry is the study of matter, its composition and the changes it undergoes.

Answer:

The scientific study of matter

Explanation:

reviewed the work, its correct

Determining if a compound contains both ionic and covalent bonds can be done by examining the types of atoms involved in the compound and the nature of their bonding.

Ionic bonds involve the transfer of electrons between a metal and a nonmetal. When this occurs, one atom becomes positively charged (cation) and the other becomes negatively charged (anion). These oppositely charged ions then attract each other to form the ionic compound.

Covalent bonds, on the other hand, involve the sharing of electrons between two nonmetals. In this type of bonding, both atoms share their valence electrons to form a bond.

If a compound contains both a metal and a nonmetal, it is likely to have ionic bonds. However, some compounds that contain only nonmetals can also have ionic bonds. For example, ammonium chloride (NH4Cl) contains only nonmetals, but it is an ionic compound because it is formed by the transfer of an electron from the nitrogen atom to the hydrogen atoms.

If a compound contains only nonmetals, it is likely to have covalent bonds. However, if the nonmetals involved have a large difference in electronegativity, they can form polar covalent bonds, which can have some ionic character.

Overall, to determine if a compound contains both ionic and covalent bonds, you should look at the types of atoms involved and the nature of their bonding. If the compound contains both metals and nonmetals, it is likely to have both ionic and covalent bonds. If the compound contains only nonmetals, it could have either purely covalent bonds or polar covalent bonds with some ionic character.

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Answer:

Beautiftul, begging under F

honest, beginning in thrid line under A

hopeful, fifth line under F

Explanation:

The correct name for the molecule C₁₁H₂₄ is 3-ethyl-5-propylhexane (option B).

The molecule C₁₁H₂₄ consists of an eight-carbon chain (octane) with an ethyl group attached at the third carbon and a propyl group attached at the fifth carbon. This gives the molecule a total of eleven carbon atoms, which is why it is called an undecane. The formula C₁₁H₂₄ indicates that there are 24 hydrogen atoms in the molecule (2 for each carbon atom).

Since the molecule has two different types of substituent groups, it is named using the IUPAC system. The names of substituent groups are arranged alphabetically and preceded by a number that indicates the position of the group on the chain. In this case, the ethyl group is at the third position and the propyl group is at the fifth position. Therefore, the name of the molecule is 3-ethyl-5-propylhexane.

Your question is incomplete, but most probably your question was

C₁₁H₂₄

Which of the following is the correct name for the molecule above? group of answer choices

A. 3-ethyl-5-methyloctane

B. 3-ethyl-5-propylhexane

C. 4-methyl-6-ethyloctane

D. 2-propyl-4-ethylhexane

Thus, the correct option is B

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Answer:

The answer is steam of fossil fuels

Answer:

B both products are elements

Explanation:

The pale green substance is likely to be chlorine gas, which is an element, and the shiny grey solid is likely to be zinc metal, which is also an element.

Answer:

Explanation:

doing this for  point hope you find out tho

Answer:

The newton (symbol: N) is the SI unit of force. It is named after Sir Isaac Newton because of his work on classical mechanics. A newton is how much force is required to make a mass of one kilogram accelerate at a rate of one metre per second squared.

1.73 atm will be the pressure if the temperature is lowered to 21.663 Celsius. The correct option is C.

Thus, the coupled gas law, which states that the product of pressure and volume is exactly proportional to the absolute temperature, may be used to calculate the pressure of the gas at 21.663 degrees Celsius. If the volume stays constant, the pressure of the gas will likewise fall correspondingly as the temperature drops.

We may use the proportionality relationship to compute the final pressure using the beginning circumstances of 2.1 atm pressure, 3.78 L volume, 82°C temperature, and 21.663°C temperature. Due to the drop in temperature, the final pressure will be 1.73 atm lower than the beginning pressure.

Thus, the ideal selection is option C.

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Answer:

Homeostasis

Explanation:

The blood vessels constrict and you start to shiver, that shivering generates heat to warm the body to help to body temperature go back to normal. Homeostasis is the condition of keeping your body at a normal condition.

During the cell cycle, compounds called cyclins increase and decrease in a regular pattern. They regulate the stages of cell division and growth.

Cell cycle development is regulated in element by way of the sequential pastime of various cyclins. The cyclins are regulatory subunits that bind, prompt and provide substrate specificity for their catalytic companion serine-threonine kinases, collectively called cyclin-established kinases.

Cyclins are a family of proteins that don't have any enzymatic interest of their personal however spark off CDKs through binding to them.

S cyclins are involved inside the induction of DNA replication and early stages of mitosis. Their stages upward push at the beginning of S phase and fall in early mitosis.

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The molality of  solution is 0.26 mol/kg

Molality is defined as "The ratio of the number of moles of solute present in a solution to the mass of the solvent in kilograms".

The unit that is used to represent molality is mol/kg.

The formula used to calculate molality is given below:

Molality = moles of solute/ mass of solvent in kg-----> (i)

Here,

Given values:

Moles of NaC₂H₃O₂ (solute) = 0.195mol

Mass of solvent (water) = 0.750 kg

Putting these values in equation (i), we get-

Molality

= 0.195 mol/0.750 kg

=0.26 mol/kg

Hence, the molality of  solution is 0. 26 mol/kg

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The condition characterized by increased body weight due to Na+ and water retention and a low blood K+ concentration is known as hypokalemia.

Hypokalemia refers to a low concentration of potassium (K+) in the blood. It occurs when there is an imbalance in the levels of potassium in the body.

In this condition, the body retains sodium (Na+) and water, leading to increased fluid volume in the body and subsequent weight gain.

The low blood K+ concentration is a result of excessive potassium loss or inadequate potassium intake.

Hypokalemia can have various causes, such as certain medications, excessive sweating, diarrhea, vomiting, kidney disorders, or hormonal imbalances.

Symptoms of hypokalemia may include muscle weakness, fatigue, irregular heartbeat, muscle cramps, and increased fluid retention.

Treatment involves addressing the underlying cause and may include potassium supplementation, dietary changes, or medication adjustments.

It's important to consult a healthcare professional for a proper diagnosis and appropriate treatment if you suspect you may have hypokalemia or any other medical condition.

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According to the temperature difference and mass, a material's thermal conductivity explains its capability to transfer heat, and its specific heat capacity indicates how much heat energy is received or released.

A material's ability to conduct or transfer thermal energy can be determined by measuring its thermal conductivity, and a material's specific heat capacity specifies the amount of thermal energy needed to raise its temperature.

A physical feature of matter known as heat capacity or thermal capacity is the quantity of heat that must be applied to an object in order to cause a unit change in temperature. Heat capacity is measured in joules per kelvin (J/K), the SI unit.

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Answer:

is it 500 g

Explanation:

cause m stands for mass

To find the amount of heat produced, the value of m which we plug is 500 grams.

Amount of heat absorbed or released during any chemical change will be calculated as:

Q = mc∆T, where

Q = absorbed or released heat

m = mass of substance

c = specific heat of substance

∆T = change in temperature

So, according to question to calculate energy in place of m we will put the given mass of aluminum which is equal to 500g.

Hence required value of m is 500g.

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Answer:

Explanation: