Please help!! I don’t know how to do this I need help ASAP

The amount of salt in the tank as a function of time is f(t) = 70 + 4t, where f(t) is the amount of salt in the tank after t minutes.

The rate of salt entering the tank is 2 lb/gal x 2 gal/min = <<2*2=4>>4 lb/min, where the concentration of salt is 2 lb/gal. Initially, the tank contains 70 lb of salt and 280 gal of water. When the brine flows into the tank at a constant rate of 2 gal/min, the concentration of salt in the tank remains constant. When the tank is stirred, the salt will be uniformly distributed throughout the mixture. Let’s assume that t is the time in minutes. As a result, the number of minutes that the solution is in the tank will be t. Since the concentration of salt in the tank remains constant, the amount of salt in the tank after t minutes is 70 lb + 4 lb/min × t.

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According to the question, helium atoms are there in the sample is (3.05 J/P) / (R × (105 + 273.15 K)) × 6.02 x 10²³ atoms/mol.

Helium atoms are the second most abundant type of atom in the universe. They are the simplest of all atoms, consisting of only two protons and two neutrons. Helium atoms are extremely lightweight, with an atomic weight of only four, making them the second lightest element after hydrogen.

The number of helium atoms in the sample can be calculated using the ideal gas law: n = PV/RT

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

Since the process is adiabatic and quasistatic, the pressure and volume of the sample can be determined from the work done on the piston:

W = P(V2 - V1)

where W is the work done, V2 is the final volume, and V1 is the initial volume.

Since the work done is 3.05 J, the final volume is 3.05 J/P. The initial volume can be determined from the ideal gas law, using the initial temperature of 105°C and the number of moles (which is unknown).

n = PV1/RT1

where n is the number of moles, P is the pressure, V1 is the initial volume, R is the ideal gas constant, and T1 is the initial temperature.

Substituting the values into the ideal gas law, we can solve for the number of moles: n = (3.05 J/P) / (R × (105 + 273.15 K))

Once the number of moles is determined, the number of helium atoms can be calculated by multiplying by Avogadro's number.

N = n × 6.02 x 10²³ atoms/mol

Therefore, the number of helium atoms in the sample is:

N = (3.05 J/P) / (R × (105 + 273.15 K)) × 6.02 x 10²³ atoms/mol.

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Being burned out means feeling empty and mentally exhausted, devoid of motivation.

What is burnout?

The ways to cope with personal stress:

Four methods that helped many supervisors cope with stress are

(1) engaging in physical exercise

(2) practicing relaxation techniques

(3) gaining a sense of control

(4) developing and maintaining good interpersonal relationships.

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Answer: C. Na2B4O7•10H2O

Explanation:

Hope this helps :)

The formula is tetrasodium borate-Na2B4O7.10H2O

Given- 0.0132 mol Na2B4O7 and 0.1311 mol H2O

Using the molar mass of the anhydrous Na2B4O7 and its mass percentage, we can calculate the molar mass of the hydrate (if we look at it as 100% of the mass) by stoichiometry.

Molar mass of Na = (22.990 g/mol)

Molar mass of B = (10.811 g/mol)

Molar mass of O = (15.999 g/mol)

Molar mass of Na2B4O7= 2⋅22.990 g/mol +4⋅10.811 g/mol +7⋅15.999 g/mol = 201.217 g/mol

201.217g/mol : 52.8%=x g/mol : 100%

​x g/mol = 201.217 g/mol⋅100%÷52.8 %

x g/mol= 381.093 g/mol

In 381.093 g of hydrate, we have 201.217 g of anhydrous Na2B4O7 , the rest of the mass is water.

381.093g−201.217g= 179.876 g of water

Molar mass of H = 1.008 g/mol

Molar mass of O = 15.999 g/mol

Molar mass of  H2O= 1.008 g/mol+ 15.999g/mol  = 18.015 g/mol

179.876g ÷18.015 = 9.98= 10 moles of water per mole of hydrate.

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Answer:

a

Explanation:

A actual molecule of glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.

Answer:

B.

Explanation:

Answer:

3.34x10¹⁶ molecules of aspirin are in a drop of blood

Explanation:

The recomended dose of aspirin in blood is 100.0μg/mL =

1x10⁻⁴g aspirin / mL of blood.

In a drop (0.100mL) there are:

0.100mL ₓ (1x10⁻⁴g aspirin / mL of blood) = 1x10⁻⁵g aspirin.

Molecular mass of aspirin is:

9C = 12.01g/mol ₓ 9 = 108.09g/mol

8H = 1.01g/mol ₓ 8 = 8.08g/mol

4O = 16g/mol ₓ 4 = 64g/mol

108.09 + 8.08 + 64 = 180.17g/mol

Thus, moles of aspirin in 1x10⁻⁵g are:

1x10⁻⁵g ₓ (1mol / 180.17g) = 5.55x10⁻⁸ moles of aspirin

In 1 mole, you have 6.022x10²³ molecules, thus:

5.55x10⁻⁸ moles of aspirin ₓ (6.022x10²³ molecules / 1 mole ) =

Answer:

see answer below

Explanation:

LOL idk what this question is about but to my understanding, having a detailed procedure gives u more clue on what u r doing and how u r doing it. think of this like a instruction manual, if u want to build a telescope and have no idea how to build it and the instrutions only give u short sentences like"screw nails next to the finger scope" or something like that wouldnt help much. i dont know about u but i rather prefer instructions written like this"first screw the nail beside the finger scope, DO NOT unscrew the botton" and continue. i cant build a telescope so yea dont know any directions to that.

A demand O2 delivery system utilizes a "pressure drop" mechanism to trigger oxygen flow.

In a demand oxygen delivery system, the flow of oxygen is triggered by a pressure drop that occurs when the user initiates inhalation. When the user takes a breath, the drop in pressure in the system activates the mechanism that releases oxygen.

This mechanism can be a valve or regulator that opens to allow oxygen to flow from the source to the user.

The pressure drop required to trigger the oxygen flow depends on the specific design of the system and can vary. Generally, the pressure drop is set at a level that ensures the user's inhalation effort is sufficient to activate the oxygen flow while maintaining a safe and reliable operation.

The pressure drop is typically calibrated and adjusted during the manufacturing process to meet the desired specifications and requirements of the system.

In summary, a demand oxygen delivery system relies on a pressure drop mechanism to initiate the flow of oxygen. This mechanism ensures that oxygen is released when the user inhales, providing them with the required oxygen supply.

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When Benzoic Acid reacts with aqueous NaOH, a species of ester and Benzene named, Benzoate Ion is formed.

When Benzoic acid is reacted with aqueous NaOH, water and Sodium benzoate is formed.

Sodium benzoate is present with water, So, the sodium benzoate dissolves in water and forms benzoate ion.

Benzoate are species of ester.

Benzoate ion is soluble in water while benzoic acid is not soluble in water.

Benzoic acid forms a layer over water.

Benzoate is of great use in industrial purposes, it is used in food preservative and beauty products.

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From permutation and combination, formulas 1716 13-bit strings contain exactly six 1's and 6435 15-bit strings that contain exactly seven 1's equals the number of ways to choose the positions for the 1's in the string

The act of placing every member of a set into a certain sequence or order is known as permutation. In other terms, the process of permuting is the reordering of the elements of a set if the set is already ordered. Nearly all areas of mathematics involve permutations in some form or another. They frequently appear when various orderings on particular finite sets are taken into account.

Contrary to permutations, the order of selection is irrelevant when choosing elements from a collection using the combination method. The number of combinations can be counted in simpler situations. The combination is the taking together of n items, k at a time, without repetition. The terms k-selection or k-combination with repetition are frequently used to describe combinations where repetition is permitted.

(a) If exactly 6 are 1's then (13-6)=7 will be 0's.

When positions of 1's are fixed, then the position of 0's will be fixed too. We can pick 6 positions from 13 positions in 13C6 ways

=13!÷6!(13-6)!

=1716

(b) r = 7  

n = 15-bit string ( which will result in a 1 and the remaining are out of 15 -7 = 8 bit result in zero

Now, Here we use a combination

No of ways to select exactly seven 1's

= n!÷r!(n-r)!  

= 15!÷7!(15-7)!  

= 15!÷ 7!(8)!

= (15×14×13×12×11×10×9×8!)÷(7×6×5×4×3×2×1×8!)

= 32,432,400÷5040

= 6435

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Answer:

We know that,

Density= mass upon volume.

mass= 21.93g

Volume= 49.3 - 46.3

= 3 cm³

Density = 21.93÷ 3

= 7.31 g/cm³

Hope it helps :))

A piece of indium with a mass of 21.93 g is submerged in 46.3 cm³ of water in a graduated cylinder. The water level increases to 49.3 cm³. The correct value for the density of indium measured in g/cm3 from these data is 7.31 g/cm³.

The density of a material is defined as its mass per unit volume. Although the Roman letter D can also be used, the most common symbol for density becomes. Mathematically, density is calculated by dividing weight by volume.

Density is frequently loosely defined as weight per unit volume, which is technically wrong; this quantity is actually more accurately characterized as specific weight. One example is the oil and gas industry in the United States.

Density= mass/volume.

mass= 21.93g

Volume= 49.3 - 46.3

           = 3 cm³

Density = 21.93÷ 3

            = 7.31 g/cm³

Therefore,  7.31 g/cm³ is the density.

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Answer:

I think the answer is 800J

Explanation:

As the kinetic energy goes down, the potential energy goes up

Answer:

A and E

Explanation:

with Adenine ,thymine , cytosine and guanine

A compound is a substance formed when two or more chemical elements are chemically bonded together.

Constituent elements involve water, physical habitat, and biological environment. Two types of chemical bonds normal in compounds are covalent and ionic bonds. The elements combine together in an exact ratio e.g. water, hydrogen, and oxygen elements are present in the ratio of 2:1.A constituent is someone who lives in a particular district, especially someone who is able to vote in an election.

one of the parts of which a thing is made up: element, ingredient. : any of the voters who elect a person to act for them. constituent. 2 of 2 adjectives. : devise a part of a whole: component.

So we can conclude that; A compound is formed when two or more atoms of dissimilar elements combine together.

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Vapor pressure of a liquid increases with increasing temperature because increasing the temperature results in increasing kinetic energy and increase in molecular transition and motion.

What is Vapor Pressure?

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Deep oceans are the reservoir that has experienced the greatest change (in amount of carbon) from the pre-industrial period to the contemporary period.

Both the water and the land absorb about the same amounts of carbon throughout the first 200 years. Because the ocean has a greater reservoir than the land (around 38,000 PgC) or the atmosphere (589 PgC before the Industrial Revolution), it dominates over longer time horizons.

With 37,000 billion tonnes of carbon stored there, the deep ocean is the greatest carbon reservoir on Earth, whereas the rest of the planet contains about 65,500 billion tonnes. Through the carbon cycle, which has both slow and quick components, carbon moves between each reservoir.

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Answer:

The only reason wood floats is because it is less dense and has big openings and gaps which allows air in.

Wood that sinks has very tiny openings. The ratio between weight and volume is called density. An object that is less dense than water can be held up by water, and so it floats.

Hope this helps! please mark me brainliest!

God bless :)

The following that would not be part of a study plan to learn chemistry is (B) Skip your instructor's study hours.

All of the other options are good study habits that can help you learn chemistry. Studying a little bit every day helps you retain the information better. Forming a study group can help you learn from each other and stay motivated. Reading the chapter before class gives you a foundation to build on during lecture. And working the sample problems helps you practice what you've learned.

However, skipping your instructor's study hours is not a good idea. Your instructor is there to help you learn the material, and they can give you personalized feedback on your work. If you're struggling with the material, skipping their study hours will only make it harder for you to succeed.

So, if you're serious about learning chemistry, make sure to include all of the good study habits in your plan, and skip the bad ones.

Here are some additional tips for creating a study plan to learn chemistry:

Therefore, (B) Skip your instructor's study hours is the correct answer.

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Answer:

36 eggs

Explanation:

12 eggs in each carton

12 + 12 + 12 = 36 eggs

or 3 * 12 = 36 eggs

Hope this helps, have a nice day/night! :D

The element with the greatest first ionization energy among the given options is Se (selenium).

Option (A) is correct.

The first ionization energy refers to the energy required to remove one electron from an atom in its neutral state, forming a positively charged ion. The greater the ionization energy, the more difficult it is to remove an electron.

Considering the elements provided, analyze their positions in the periodic table to make an educated guess:

A. Se (selenium) - Selenium is found in Group 16 (Group 6A) of the periodic table.

B. S (sulfur) - Sulfur is also found in Group 16 (Group 6A) of the periodic table.

C. K (potassium) - Potassium is found in Group 1 (Group 1A) of the periodic table.

D. Cl (chlorine) - Chlorine is found in Group 17 (Group 7A) of the periodic table.

E. Ca (calcium) - Calcium is found in Group 2 (Group 2A) of the periodic table.

Based on the periodic trends, the elements in the upper right portion of the periodic table tend to have the greatest first ionization energies. This is because these elements have a higher effective nuclear charge and a smaller atomic radius.

Comparing the given options, we can see that:

A. Se and B. S are both in Group 16 (Group 6A). Since they are closer to the upper right portion of the periodic table, would expect them to have higher first ionization energies compared to the other options.

C. K is in Group 1 (Group 1A), which is in the far left portion of the periodic table. Elements in this group tend to have lower first ionization energies compared to those in the upper right portion.

D. Cl is in Group 17 (Group 7A), which is closer to the upper right portion of the periodic table compared to Group 1. Therefore, chlorine would have a higher first ionization energy than potassium but likely lower than selenium and sulfur.

E. Ca is in Group 2 (Group 2A), which is to the left of Group 1. Elements in Group 2 have higher first ionization energies compared to those in Group 1 but generally lower than elements in the upper right portion.

Considering these trends, the element with the greatest first ionization energy among the given options is:

A. Se (selenium)

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Methanol is a hazardous substance that can cause a range of   problems if ingested or inhaled.

Some of the common hazards associated with methanol include blindness, respiratory failure, and even death. However, one hazard that is not typically associated with methanol is skin irritation or corrosion. While methanol can be harmful if it comes into contact with the skin, it is not known to cause significant irritation or corrosion in the way that some other chemicals do .Methanol is a toxic substance that is commonly used in industrial applications such as fuel, solvents, and antifreeze. The substance is highly flammable and can cause a range of health problems if ingested or inhaled. Methanol poisoning can lead to symptoms such as dizziness, nausea, vomiting, and even death. However, one hazard that is not commonly associated with methanol is skin irritation or corrosion. Unlike some other hazardous substances, methanol is not known to cause significant skin irritation or corrosion. However, it is important to note that methanol can still be harmful if it comes into contact with the skin. If methanol is spilled on the skin, it should be immediately washed off with soap and water. If methanol is ingested, medical attention should be sought immediately.

methanol is a hazardous substance that can cause a range of health problems if ingested or inhaled. While skin irritation or corrosion is not typically associated with methanol, it is still important to take precautions when handling the substance to avoid any potential harm. If you suspect that you have been exposed to methanol, seek medical attention immediately.

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The thalidomide catastrophe led to stricter rules for medication approval in numerous nations. Thalidomide is a racemic combination of the (R)- and (S)-enantiomers and exists in two mirror-image forms. The (S)-isomer is teratogenic, whereas the (R)-enantiomer has sedative properties.

Enantiomer theory enters the picture at this point. The thalidomide molecule can be found in two different forms in nature, (R)-thalidomide and (S)-thalidomide, which are enantiomers, or molecules that are mirror images of one another.

While the (S)-form is a teratogen, an agent that can result in birth abnormalities, the (R)-form possesses therapeutic qualities.

Therefore, It is extremely difficult and dangerous to isolate pure (R)- thalidomide because the two enantiomers of the drug regularly interconvert in the body to create a mixture that contains both enantiomers.

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Ionic bonds are a type of chemical bond that occurs between two atoms when one or more electrons are transferred from one atom to another.

Ionic Bond involves the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions) that are formed as a result of this electron transfer.

Here are a few examples of minerals that are classified as ionic compounds:

1. Sodium Chloride (NaCl): Commonly known as table salt, sodium chloride is a mineral formed by the ionic bonding between sodium cations (Na+) and chloride anions (Cl-).

2. Calcium Carbonate (CaCO₃): Calcium carbonate is a mineral found in various forms, including limestone, chalk, and marble. It is composed of calcium cations (Ca²⁺) bonded to carbonate anions (CO₃²⁻).

3. Potassium Feldspar (KAlSi₃O₈): Potassium feldspar is a group of minerals that includes orthoclase, microcline, and sanidine. It consists of potassium cations (K+) bonded to aluminum silicate anions (AlSi₃O₈).

4. Magnesium Sulfate (MgSO₄): Magnesium sulfate, also known as Epsom salt, is an ionic compound composed of magnesium cations (Mg²⁺) bonded to sulfate anions (SO₄²⁻).

5. Iron Oxide (Fe₂O₃): Iron oxide is a mineral category that includes compounds such as hematite and magnetite. It consists of iron cations (Fe³⁺) bonded to oxide anions (O₂⁻).

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The volume of the solution is approximately 234 milliliters when 8.35 grams of CuNO₃ is dissolved in water to make a 0.190 M solution.

To find the volume of the solution in milliliters, we need to use the equation:

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

First, we need to calculate the number of moles of CuNO₃ in the given mass.

Step 1: Convert mass to moles.

Molar mass of CuNO₃ = (63.55 g/mol) + (14.01 g/mol) + (3 * 16.00 g/mol) = 187.55 g/mol

Moles of CuNO₃ = Mass of CuNO₃ / Molar mass of CuNO₃

Moles of CuNO₃ = 8.35 g / 187.55 g/mol ≈ 0.0445 mol

Step 2: Calculate the volume of the solution.

Molarity = Moles of solute / Volume of solution

Volume of solution = Moles of solute / Molarity

Volume of solution = 0.0445 mol / 0.190 mol/L ≈ 0.234 L

Step 3: Convert liters to milliliters.

Volume of solution (in milliliters) = 0.234 L * 1000 mL/L ≈ 234 mL

Therefore, the volume of the solution is approximately 234 milliliters.

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Answer:

radiation B species x because short canines are less likely to break.

Answer:scientists finished deciding the human genome in 2001. This research helped genetics analyze and islote sections of DNA for investigation. Without this information and the technology invented during the Human Genome Project, Hugh would not have been able to extract portions of his daughters DNA. Also, he wouldn’t have been able to see the genes that did not function properly in his daughters DNA.

Explanation: this is a right answer for PLATO.