IN A TEST RN! Please help ASAP

A teacher dissolves 0.761 moles of Kl in water to produce a 2.78 L of solution. Determine the molarity of the Kl solution. Express your answer in 3 decimal places.

Answer: A private conversation between two people.

Explanation: Hope this Helps.

Answer:

here

Explanation:

My guess is if she's into you for your size she's gonna want to have s## alot, but if she's into your personality she wants to hang out with you and compliments you this is my guess so sorry if this isnt good

Answer:

The specification of the query in the discussion is characterized below.

Explanation:

Answer:

Red, because it has less volume and more amount of matter.

Explanation:

the answer is "Green, because it has less volume and less amount of matter."

After 11,460 years (which is exactly two half-lives of 14C), only 1/4 of the initial amount of 14C will remain, since half of the remaining 14C will have decayed twice.

What is Half Life?

Half-life is a term used to describe the time it takes for half of the atoms in a radioactive substance to decay. It is a characteristic property of each radioactive isotope, and it is used to measure the rate of decay of the isotope.

The process of radioactive decay involves the spontaneous transformation of an unstable atom into a more stable atom by emitting radiation in the form of particles or electromagnetic waves. The rate of decay of a radioactive substance is proportional to the number of atoms present, and it can be described mathematically using an exponential decay equation.

The half-life of a radioactive substance is the time it takes for half of the initial amount of the substance to decay. In the case of 14C, its half-life is approximately 5730 years. This means that after 5730 years, half of the 14C in a given sample will have decayed, and after another 5730 years, half of the remaining 14C will have decayed, and so on.

Therefore, after 11,460 years (which is exactly two half-lives of 14C), only 1/4 of the initial amount of 14C will remain, since half of the remaining 14C will have decayed twice. This means that there will only be 1/2 of a given sample left after 5730 years, and 1/4 of a given sample left after 11,460 years.

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The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer:

The answer is B, in this case.

Explanation:

An isomer is a molecule with the same number of atoms as another compound, but they differ in arrangement of the atoms.

Answer:

joib

Explanation:

The new volume of the gas whose pressure was changed would be = 40 milliliters.

The initial volume(V1)of the gas= 20ml

The initial pressure(P1) = 4 atm

The final pressure(P2) = 2 atm

The final volume(V2) = ?

Using the general gas formula;

P1V1 = P2V2

V2 = P1V1/P2

= 4×20/2

= 40ml

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The column 1 has the value of Isotope, column 2 has the value of mass in atomic mass units, and column 3 has the value of abundance and the average atomic mass of strontium is 87.47 amu.

To calculate the average atomic mass of strontium using the given information, we need to multiply the mass of each isotope by its abundance and then sum up these values. Here's the calculation:

Isotope | Mass (amu) | Abundance

^84Sr | 83.913428 | 0.56%

^86Sr | 85.909273 | 9.86%

^87Sr | 86.908902 | 7.00%

^88Sr | 87.905625 | 82.58%

To find the average atomic mass, we multiply each isotope's mass by its abundance (in decimal form) and sum up the values:

Average atomic mass = (\(Mass of ^{84Sr}\) × \(Abundance of^{84Sr}\)) + (\(Mass of ^{86Sr}\)× \(Abundance of^{86Sr}\)) + (\(Mass of ^{87Sr}\) × \(Abundance of^{87Sr}\)) + (\(Mass of ^{88Sr}\) × \(Abundance of^{88Sr}\))

Average atomic mass = (83.913428 amu × 0.0056) + (85.909273 amu × 0.0986) + (86.908902 amu × 0.0700) + (87.905625 amu × 0.8258)

Calculating this expression yields:

Average atomic mass = 0.469901638 + 8.468098826 + 6.08462314 + 72.44409075

= 87.466714354 amu

Rounding the result to two decimal places, the average atomic mass of strontium is approximately 87.47 amu.

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Answer: 2755.2 g of \(Fe\) will be produced from 24.6 mol of haematite.

Explanation:

The balanced chemical equation is:

\(Fe_2O_3+3CO\rightarrow 2Fe+3CO_2\)  

According to stoichiometry :

1 mole of \(Fe_2O_3\) produce = 2 moles of \(Fe\)

Thus 24.6 moles of \(Fe_2O_3\) will produce=\(\frac{2}{1}\times 24.6=49.2moles\)  of \(Fe\)  

Mass of \(Fe=moles\times {\text {Molar mass}}=49.2moles\times 56g/mol=2755.2g\)

Thus 2755.2 g of \(Fe\) will be produced from 24.6 mol of haematite.

Answer:

your mom

Explanation:

If there had been five exons and four introns, the result would have been. The four introns will be forced to loop in order to bring out the adjacent exons together.

An exon is any part of a gene that will be included in the final mature RNA produced by that gene after introns are removed via RNA splicing. Exons refer to both the DNA sequence within a gene and the corresponding RNA transcript sequence. In RNA splicing, introns are removed and exons are covalently joined to form mature RNA. The genome is made up of the entire set of genes for a species, and the exome is made up of the entire set of exons."The concept of the cistron must be replaced by that of a transcription unit," wrote American biochemist Walter Gilbert in 1978.

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Chemical precipitation occurs when a product is insoluble and precipitates out of a solution. By comparison, precipitation reactions require the reactants to be soluble in the solvent.

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Answer:  1.) insoluble 2.) soluble

Explanation: EDMENTUM

A cup is 240 ml and the cake recipe calls for 170.0 ml of milk. It's 2/4 of a cup.

the cups have a standard measure of 240ml, that is, if you buy one of these good quality utensils, even if in different places, the measure of 1 cup must always be equivalent to 240ml.

With this information, we can conclude that Ml is the abbreviation milliliter, the smallest unit of measurement for liquids. We start with the liter as the base unit, we must go down to one tenth of a liter, which is deciliter, then 100 tenths of a liter than the centiliter and we go up to one thousand tenths of a liter, which is milliliter. One liter contains one thousand milliliters.

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Answer:

The substance that is dissolved in another substance to create a solution is a Solute. A Solute is a minor component in a solution which is a substance that is being dissolved, while the solvent is the dissolving medium. Solutions can be formed with many different types and forms of solutes and solvents.

Answer:

Bohr

Explanation:

Neils Bohr was the scientist that suggested that electrons follow predictable orbits round the nucleus.

Answer:

schrodinger

Explanation:

jelly benee

Answer:

300×175=52500

Explanation:

caculator

Answer:

CO2 is a trigonal planar.

Answer:

1.03 x 10²³ atoms NaCl

Explanation:

To find the amount of table salt (NaCl) in atoms, you need to (1) convert grams to moles (using the molar mass) and then (2) convert moles to atoms (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units.

(Step 1)

Molar Mass (NaCl): 22.99 g/mol + 35.45 g/mol

Molar Mass (NaCl): 58.44 g/mol

10 grams NaCl                1 mole
------------------------  x  -----------------------  =  0.17 moles NaCl
                                   58.44 grams

(Step 2)

Avogadro's Number:

6.022 x 10²³ atoms = 1 mole

0.17 moles NaCl           6.022 x 10²³ atoms
--------------------------  x  --------------------------------  =  1.03 x 10²³ atoms NaCl
                                                 1 mole

Option (a) is correct. The standard free energy change in KJ  for the reaction, 2Cu+(aq.) ----> Zn(s) + 2Cu2+(aq.) is greater then one.

The standard cell potential, E∘ cell and the standard Gibbs free energy, ΔG∘ are related to each other. The standard cell potential is the potential difference between the cathode and anode. The standard Gibbs free energy of formation of a compound is the change of Gibbs free energy that accompanies the formation of 1 mole of a substance in its standard state from its constituent elements in their standard states. It is expressed by the equation,

         ΔG∘ = nFE∘cell

where n is the number of transferred electrons

          F is the Faraday's constant.

Since a spontaneous reaction has a negative ΔG∘, a spontaneous redox reaction must have a positive ΔE∘cell. The opposite is true for non-spontaneous reactions.

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If 100 s of heat is added to a system and 0.100 ks of work is done by the system, then the value of ΔE or DE (change in internal energy) is 200 J, which is in option A. This is as per the first rule of thermodynamics.

ΔE = Q - W

ΔE (change in internal energy)

Given that 100 J (joules) of heat is added to the system (Q = 100 J) and 0.100 kJ (kilojoules) of work is done by the system (W = -0.100 kJ), we need to ensure that the units are consistent.

Since 1 kJ = 1000 J, we can convert the work done to joules:

W = -0.100 kJ = -0.100 × 1000 J = -100 J

Now one can substitute the values into the equation:

ΔE = Q - W

= 100 J - (-100 J)

= 100 J + 100 J

= 200 J

Therefore, the value of ΔE (change in internal energy) is 200 J.

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complete question is below

if 100s of heat is added to a system and 0.100ks of work is done by the system, what is the value of DE​

A. 200 j

B.50 j

C.2 j

D. 10000j

As per the balanced equation of the reaction one mole of Mg give s one mole of H2. 1.10 g of magnesium is 0.045 moles. Thus it gives 0.045 moles of H2 which is 1.02 litres.

Magnesium chloride is an ionic compound formed by the reaction of magnesium metal with two moles of hydrochloric acid. The reaction also produce one mole  hydrogen gas.

The atomic mass of magnesium is 24 g/mol. Thus number of moles in 1.10 g is 1.10/24 = 0.045 moles.

As per the reaction equation one mole of magnesium gives one mole of hydrogen gas. Thus 0.045 moles of magnesium gives 0.045 moles of hydrogen gas.

At STP, the volume of one mole of any gas will be equal to 22.4 L. Thus volume of 0.045 moles of hydrogen at STP is:

volume = 0.045 × 22.4

             =1.02 L.

Hence, the volume of hydrogen produce here is 1.02 L.

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The concentration of the new potassium permanganate, KMnO solution is 0.06 M.

To find the concentration of the new solution, we can use the formula,

C₁V₁ = C₂V₂,

C₁ = 0.75,

V₁ = 20.0 mL,

V₂ = 250.0mL

C₂ is what we have to find. Plugging in the values we know, we get,

0.75 M x 20.0 mL = C₂ x 250.00 mL

Solving for C₂, we get the final concentration of the potassium permanganate.

C₂ = (0.75 M x 20.0 mL) / 250.00 mL

C₂ = 0.06 M

Therefore, the concentration of the solution has changed to 0.06 M from 0.75M.

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The water molecule is formed by the covalent bonding between oxygen and hydrogen atoms. Therefore, option C is correct.

Covalent bonding is a type of chemical bonding that involves the sharing of electrons between two atoms. In covalent bonding, the two atoms share a pair of electrons to fill their outermost electron shell and form a stable molecule.

This type of bonding usually occurs between non-metal atoms, which have a high electronegativity and tend to attract electrons strongly. In a covalent bond, the shared electrons are attracted to the positively charged nuclei of both atoms, creating a strong bond.

The strength of the bond depends on the number of shared electrons and the distance between the nuclei. Covalent bonds can be either polar or nonpolar, depending on the electronegativity difference between the two atoms.

In water the bond is formed between oxygen atom and two hydrogen atoms. Hence, C is correct.

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The substance begins to boil at 2750⁰C, the substance begins to melt at 1500⁰C, the temperature at which the substance is both a liquid and a gas at 2750⁰C, temperature is the substance both a solid and a liquid​ at 1500⁰C.

Heating curves are the graphical correlations between heat added to a substance. When viewed from a cooling perspective, ie. loss of heat, it is the cooling curve.

The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance, and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.

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Answer:

B. 0.0000005461m

I used the method of moving the decimal.

Answer:

B. He could breed his peach plants with peach plants that can survive the frost.

Explanation:

Tom can best solve his problem by breeding his peach plants with the ones that can survive the frost.