for the reaction and the standard free energy change for the reaction of 1.94 moles of at 262 k, 1 atm would be

70 g of a solid solute is added to 50 g of water at 20 °c, and it all dissolves. when additional solute is added, it does not dissolve. KI is the solute.

What is solute ?

A solute is a substance that has dissolved in a solution. Molecules of the solvent often outnumber those of the solute in a fluid solution. In our daily lives, salt and water are two of the most prevalent solutes. Salt becomes a solute when it is dissolved in water.

What is solvent?

Solvents are employed to dissolve the substances that serve as the formulation's solutes. The components of these solutes can be solids, liquids, or gases. The use of a suitable solvent in conjunction with the solute is required to create a solution.

given: 70g of solute is added to 50g of water at 20degree C

solution: at 20degree C,

since graph is for 100g of water

multiple by 2

2 x 50g of water=100g of water

similarly 2 x 70g of solute= 140g of solute

at 20degree C, The solute KI falls at 140g

Therefore , KI is the solute

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1) C3H6O because there are 6 hydrogen in formula and one oxygen. 2) H2So4 sulphric acid.  

Chemical formulas can be divided into three categories: empirical, molecular, and structural. Molecular formulas display the quantity of each type of atom in a molecule, while structural formulas display the simplest whole-number relationship between the atoms in a compound. Empirical formulas display the simplest whole-number relationship between the atoms in a compound.

3) C2H2 ethyne where carbons have triple bond.

4) CO carbon monoxide where C and O have triple bond between them  .

5) HNO3 is nitric acid .

6) CH2F2

7) Ch2O

8) C2H4 is ethene in which carbon carbon have double bonds.

9) SO3 sulphur trioxide.

10) CH3F

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Answer:

55641.656 × 10^23 molecules

Explanation:

Get the molar mass, multiply by amount of stuff, multiply by Avogadros number.

More detail in picture attached.

Hope it helps. Brainliest Appreciated. :)

Answer:

its B

Explanation:

this is pretty obvious since I know about this and did it already.

I Hope this helps!

GOODLUCK!!!!!!!

The molar mass of the substance is approximately 186.92 g/mol.

To calculate the molar mass of a substance, we divide the mass of the substance by the number of moles. In this case, we are given the mass of the substance as 21.9 g and the number of moles as 0.117 mol. By dividing these two values, we can determine the molar mass.

Molar mass = Mass of the substance / Number of moles

Given:

Mass of the substance = 21.9 g

Number of moles = 0.117 mol

Substituting the values into the equation:

Molar mass = 21.9 g / 0.117 mol

Solving the equation:

Molar mass ≈ 186.92 g/mol

The molar mass of the substance is approximately 186.92 g/mol. This means that for every 1 mole of the substance, it has a mass of 186.92 grams. The molar mass is an important property used in chemistry to determine the amount of substance in a given mass or vice versa.

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They are classified on the basis of their physical features- Shape and Appearance.

The four basic shapes of bacteria are Coccus (spherical or ovoid), bacillus (rod-like), vibrio (comma-shaped ), and spirilla (spiral or helical shaped).

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Based on the data table provided, it appears that the unknown solution has reacted with several different solutions to form various precipitates. By analyzing the reactions and the resulting precipitates, we can make some educated guesses about the composition of the unknown solution.

For example, the fact that a precipitate forms when the unknown solution is mixed with solutions of barium chloride, silver nitrate, and lead(II) nitrate suggests that the unknown solution contains chloride, nitrate, and/or sulfate ions. Furthermore, the fact that no precipitate forms when the unknown solution is mixed with solutions of potassium chloride and sodium sulfate suggests that the unknown solution does not contain these ions.

However, it is important to note that precipitation reactions alone cannot definitively identify the components of an unknown solution. Further testing, such as titrations or spectroscopic analysis, may be necessary to confirm the composition of the unknown solution.

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Answer: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element?

Explanation: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element? 74.92 amu. Use your periodic table to determine which element this is. As. An element exists

The average atomic mass of the element is 74.93 amu

Let the 1st isotope be A

Let the 2nd isotope be B

Let the 3rd isotope be C

From the question given above, the following data were obtained:

Abundance of A (A%) = 24.1%

Mass of A = 75.23 amu

Abundance of B (B%) = 48.7%

Mass of B = 74.61 amu

Abundance of C (C%) = 27.2%

Mass of C = 75.23 amu

The average atomic mass of the element can be obtained as follow:

= [(75.23 × 24.1)/100] + [(74.61 × 48.7)/100] + [(75.23 × 27.2)/100]

= 18.13043 + 36.33507 + 20.46256

Thus, the average atomic mass of the element is 74.93 amu

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The final temperature of both substances at thermal equilibrium is 51.96°C.

Solution:

31.91 T =10374.27

T= 325.11 K or T= 51.96 °c

Final equilibrium Temperature (T) = 51.96°C.

Two systems are said to be in thermal equilibrium when they are in contact with each other and there is no energy flow between them. Simply put, thermal equilibrium means that two systems are at the same temperature. The zero law of thermodynamics states that if two systems are in thermodynamic equilibrium with his third system, then the original He said that the two systems are in thermal equilibrium with each other.

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Answer:

15 grams of water will absorb 2,500 Joules  in going from 20.0 to 60.0 C.

Explanation:

The heat involved in raising a mass (m) of a substance with a specific heat (c) from one temperature to another (Delta T) is given by:

Heat = mc(Delta T)

2,500 Joules = m*(4.186J/gC)*(60C-20C)

2,500 Joules = m*(4.186J/gC)*(40C)

2,500 Joules = m*(4.186J/gC)*(40C)

m = (2,500J)/(4.186*40J/g)

m = 14.93 grams

Answer: B (15g)

Explanation:

The number of significant figures in each of the following measured quantities: (a) 3.774 km = 4  (b) 205 m² = 3 (c) 1.700 cm = 4 (d) 350.00 K = 5 (e) 307.080 g = 6 (f) 1.3 × 10³ m/s = 2.

These are minimum number from zero to nine which are  required for reporting any measurement in significant figures digit is uncertain.

The starting zero are not significant figures, decimal is not a significant figures, ending zero after decimals are significant figures and ending zero before without decimal is not significant figures.

Therefore, number of significant figures in each of the following measured quantities: (a) 3.774 km = 4  (b) 205 m² = 3 (c) 1.700 cm = 4 (d) 350.00 K = 5 (e) 307.080 g = 6 (f) 1.3 × 10³ m/s = 2.

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The molarity of the bromide ion, Br¯ in the solution is 0.3 M

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Molarity = mole / Volume

Molarity of zinc bromide = 0.0225 / 0.15

Molarity of zinc bromide = 0.15 M

Dissociation equation

ZnBr₂(aq) -> Zn²⁺(aq) + 2Br¯(aq)

From the balanced equation above,

1 mole of ZnBr₂ contains 2 moles of Br¯

Therefore,

0.15 M ZnBr₂ will contain = 0.15 × 2 = 0.3 M Br¯

Thus, the molarity of bromide ion, Br¯ in the solution is 0.3 M

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Answer: Atoms contain tiny, negatively charged electrons

Explanation: Thomson's experiments with cathode ray tubes helped him to discover the electron (which Dalton did not know about). Dalton thought that atoms were indivisible particles, and Thomson's discovery of the electron proved the existence of subatomic particles.

Answer: A dune is a mound of sand formed by the wind, usually along the beach or in a desert.  Dunes can also be formed by strong currents beneath the water.

The synthesis of CH3CH2CH2CHO from two-carbon starting materials involves the formation of acetylene from calcium carbide and water, followed by hydrogenation to form ethane.

A chlorination reaction is a chemical reaction in which one or more chlorine atoms are introduced into a molecule, either in place of another atom or as an addition to the molecule. The general equation for a substitution chlorination reaction is:

RH + Cl2 -> RCl + HCl

One possible synthesis of CH3CH2CH2CHO, also known as butanal, from two-carbon starting materials is:

Step 1: Formation of acetylene (C2H2) from calcium carbide and water.

CaC2 + 2H2O -> C2H2 + Ca(OH)2

Step 2: Hydrogenation of acetylene to form ethane (C2H6).

C2H2 + 2H2 -> C2H6

Step 3: Reaction of ethane with chlorine (Cl2) to form 1-chloroethane (C2H5Cl).

C2H6 + Cl2 -> C2H5Cl + HCl

Step 4: Reaction of 1-chloroethane with sodium cyanide (NaCN) to form 1-cyanopropane (C3H7CN).

C2H5Cl + NaCN -> C3H7CN + NaCl

Step 5: Hydrolysis of 1-cyanopropane to form butanal (CH3CH2CH2CHO).

C3H7CN + 2H2O -> CH3CH2CH2CHO + NH3

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Answer:

spacecraft, airplanes, cars

Answer: submarines, ships, spacecraft

The statement " nutrition is the acquisition of chemical substances by organisms for use as an energy source or as building blocks of cellular structures" is true.

Nutrition is indeed the acquisition of chemical substances by organisms for use as an energy source or as building blocks of cellular structures. Organisms require various nutrients, including carbohydrates, proteins, fats, vitamins, minerals, and water, to carry out their metabolic processes, maintain growth and development, and support overall health and well-being.

These chemical substances obtained through nutrition are utilized by organisms to provide energy for cellular processes, such as respiration, synthesis of biomolecules, and movement. They also serve as building blocks for the construction and repair of cellular structures, including proteins, nucleic acids, lipids, and carbohydrates.

Nutrition is a fundamental process that ensures the availability of essential nutrients for organisms to carry out their life functions effectively. Different organisms have varied nutritional requirements depending on their specific metabolic needs, lifestyles, and physiological characteristics.

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The number of hamburgers sold on Wednesday is 275.

Let's assume the number of hamburgers sold is x.

According to the given information, the number of cheeseburgers sold is 70 more than the number of hamburgers. So, the number of cheeseburgers sold can be expressed as x + 70.

The total number of hamburgers and cheeseburgers sold is given as 620, so we can set up the following equation:

x + (x + 70) = 620

Combining like terms, we get:

2x + 70 = 620

Subtracting 70 from both sides of the equation:

2x = 550

Dividing both sides by 2:

x = 275

Therefore, the number of hamburgers sold on Wednesday is 275.

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Answer:

No, Lithium is the softest alkai metal

Explanation:

hope this helps :)

In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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To increase the velocity of submicroscopic particles with uniform mass, you would need to add energy or apply a force to them. This can be achieved through methods such as heating, electromagnetic fields.

To increase the velocity of the particles, you need to provide them with additional energy or apply a force. One way to achieve this is by heating the particles, which increases their kinetic energy and consequently their velocity. Another method is to apply electromagnetic fields, such as electric or magnetic fields, to exert a force on the particles and accelerate them. Additionally, mechanical acceleration techniques, such as using a propelling device or applying a physical force, can also be employed to increase the velocity of the particles. By implementing these approaches, you can effectively enhance the velocity of the submicroscopic particles.

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The evolution of firearm and tool mark identification in forensic science has been shaped by various significant events. Here are five key milestones that have contributed to its development:

St. Valentine's Day Massacre (1929): The high-profile nature of this event, where seven gangsters were murdered, highlighted the need for improved forensic techniques. This led to the establishment of the first scientific crime laboratory in the United States by the Chicago Police Department, which included firearm examination as an important discipline. Landsdowne Committee (1960): The committee, led by Sir Ronald Fisher, conducted an investigation into the principles and reliability of firearm identification. Their report laid the foundation for statistical methods in firearms identification, emphasizing the importance of scientific rigor and standardization.

Introduction of the Comparison Microscope (1963): The comparison microscope revolutionized firearm examination by allowing side-by-side comparisons of bullet striations and tool marks. This breakthrough greatly enhanced the accuracy and efficiency of forensic analysis.The FBI's Firearms and Toolmarks Examiner Training Program (1978): The FBI established a comprehensive training program for firearms examiners, providing standardized protocols and promoting expertise in the field. This program played a vital role in enhancing the quality and consistency of firearm and tool mark identification across the United States.Introduction of Computerized Systems (1990s):

The integration of computerized systems allowed for digitization, storage, and retrieval of firearm and tool mark data. This advancement improved information management, facilitated comparison searches, and increased the speed and accuracy of identification processes.

These events represent significant milestones in the evolution of firearm and tool mark identification, leading to advancements in techniques, standardization, training, and technological integration, ultimately enhancing the reliability and efficiency of forensic science in this field.

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Answer:

Charges that are opposite each other, such as positive and negative charges, draw each other. Like charges repel each other, such as two negative charges or two positive charges.

Explanation:

Answer:

Opposite electric forces attract each other.

Like if it's positive and negative they will come together.

If they are the same(positive and positive or negative and negative) they will repel each other.

Explanation:

Answer:

that isn't a full equation but I will assume this is = to 0

that makes x 30.95

Explanation:

The ion in seawater that serves as a buffer is HCO₃⁻ (bicarbonate ion). Option D is correct.

Seawater is a complex mixture of various dissolved salts and ions, including sodium (Na⁺), chloride (Cl⁻), calcium (Ca²⁺), and bicarbonate (HCO₃⁻).

A buffer is the solution which resists changes in pH when an acid or base is added to it. It consists of a weak acid and its conjugate base, or a weak base and its conjugate acid. In the case of seawater, the bicarbonate ion (HCO₃⁻) acts as a buffer.

HCO₃⁻ can act as both a weak acid and its conjugate base. It can donate a proton (H⁺) to act as an acid or accept a proton to act as a base. This ability to accept or donate protons helps maintain the pH of seawater within a relatively narrow range.

When an acid is added to seawater, the bicarbonate ion (HCO₃⁻) can accept the excess protons and convert into carbonic acid (H₂CO₃). This conversion helps to reduce the increase in acidity and prevent a drastic decrease in pH.

Therefore, HCO₃⁻ in seawater acts as a buffer, helping to stabilize and maintain the pH of the water despite the addition of acids or bases.

Hence, D. is the correct option.

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Beryllium exists in Group 2 (Column 2) with the atomic number 4.

The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.

The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number.

The number of protons in an atom determines its atomic number, and isotopes have the same atomic number but different numbers of neutrons.

Beryllium exists in Group 2 (Column 2) with the atomic number 4.

The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.

The atomic number is the small number on the top left corner of the square of the element.

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Answer:

2.040 mol CO

Explanation:

First, write out your reaction:

CO + O2 --> CO2

Balance the reaction:

2CO + O2 --> 2CO2

Now divide the 32.65 g O2 by the molar mass of O2 (32.00 g/mol) to get moles of O2. Then multiply by the mole ratio of 2 mol CO for every 1 mol O2 to get moles of CO needed to fully react.

32.65 g O2 / 32.00 g/mol = 1.020 mol O2

1.020 mol O2 • 2 mol CO / 1 mol O2 = 2.040 mol CO