determine the quantity in moles of rbf that are in 57.0 grams of rbf. 0 . 5 4 6

a. 1,4332 g

b. 7.54~g

Given

Reaction

MgCl2 (s) + 2 AgNO3 (aq) → Mg(NO3)2 (aq) + 2 AgCl (s)

20 cm of 2.5 mol/dm^3 of MgCl2

20 cm of 2.5 g/dm^3 of MgCl2

Required

the mass of silver chloride - AgCl

Solution

a. mol MgCl2 :

\(\tt 20~cm^3=20\times 10^{-3}~dm^3\\\\mol=M\times V\\\\mol=2.5~mol/dm^3\times 20\times 10^{-3}DM^3=0.05\)

From equation, mol AgCl = 2 x mol MgCl2=2 x 0.05=0.1

mass AgCl(MW=143,32 g/mol)= 0.1 x 143,32=1,4332 g

b. mol MgCl2 (MW=95.211 /mol):

\(\tt mol=M\times V\\\\mol=\dfrac{2.5~g/dm^3}{95,211 g/mol}=0.0263~mol/dm^3\)

From equation, mol AgCl = 2 x mol MgCl2=2 x 0.0263=0.0526

mass AgCl(MW=143,32 g/mol)= 0.0526 x 143,32=7.54~g

Answer:

The reddish-brown substance is a different color than the fertilizer, which is white, and the substance that makes up the pipe, which is gray. This means that they cannot be the same substance because they do not have the same properties. The atomic models show that the reddish-brown substance is made up of different repeating groups of atoms than the fertilizer and the pipe substance. The difference in atoms caused the difference in properties.

Explanation:

lul

People of westfield identifying the reddish brown substance and that substance is rust i.e. iron oxide.

Rust is a chemical compound which is formed by the oxidation reaction between iron and oxygen for the formation of iron oxide.

People of westfield observed the reddish brown color in the water, that is the rust compound which is obtained by the chemical reaction occur between the iron pipes and the compound present in the fertilizers that are present in water.

Hence, the reddish brown substance in rust.

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The mass percentage of water in the solution is 24.8%. To find the mass percentage of water in the solution, we need to first calculate the mole fraction of water in the solution. The total mole fraction of the solution is 1, so the mole fraction of water can be found by subtracting the mole fraction of methanol from 1.

Mole fraction of water = 1 - 0.548 = 0.452

Now, we can use the mole fraction of water to calculate the mass percentage of water in the solution. We know that the total mass of the solution is made up of the mass of water and the mass of methanol. Therefore,

Mass fraction of water = (Mole fraction of water * Molar mass of water) / (Mole fraction of water * Molar mass of water + Mole fraction of methanol * Molar mass of methanol)

Plugging in the values, we get

Mass fraction of water = (0.452 * 18) / (0.452 * 18 + 0.548 * 32) = 0.248 or 24.8%

Therefore, the mass percentage of water in the solution is 24.8%.

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Answer:

It is at the greater angle (higher solar elevation) that the surface area receives the most energy because the rays are spread out less. ... The smaller the elevation angle (30°, 20°, 10°) the less energy received per square centimeter, because the rays spread out over a greater area.

Explanation:

correct me if I'm wrong

False. The addition of a solute to a solvent typically lowers the freezing point of the solution compared to the freezing point of the pure solvent.

This is due to the fact that the solute particles interfere with the arrangement of the solvent particles, which makes it more difficult for the solution to freeze. As a result, the solution has to be cooled to a lower temperature in order for it to freeze, which results in a lower freezing point compared to the pure solvent. Freezing point depression is a colligative property, which means that it depends on the concentration of solute particles in the solution, rather than on their chemical nature. When a non volatile  solute (a solute that does not evaporate at room temperature) is dissolved in a solvent, it increases the number of solute particles in the solution. These solute particles interfere with the arrangement of the solvent particles, making it more difficult for the solvent to freeze. As a result, the solution has to be cooled to a lower temperature in order for it to freeze, which results in a lower freezing point compared to the pure solvent. To summarize, the addition of a non volatile solute to a solvent typically lowers the freezing point of the solution, and therefore the statement "The freezing point of the solution is unchanged by the addition of the solvent" is false.

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1. a chemical bond between atoms with similar electronegativities - covalent bond

2. a measure of the ability of an atom to attract electrons within a chemical bond - Electronegativity

3. a bond between atoms of greatly differing electronegativities - Ionic bond

4. the bond formed in metals, holding metals together - Metallic bond

A covalent bond is a bond formed by sharing electrons between two atoms that occur in the bond. It generally forms between atoms with similar electronegativity values.

An ionic bond is a bond formed between two oppositely charged ions of her and held by strong electrostatic attraction. It forms between atoms that have vastly different electronegativities.

Electronegativity is the tendency of an atom in a covalent bond to attract a shared pair of electrons.

A metallic bond is a bond formed by electrostatic attraction between a positively charged metal ion and a conduction electron.

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Answer:

b, d, e

Explanation:

An atom is made up of electrons, protons and neutrons. Gold is an atom thus has the above particles.

The correct answers are b. a solution of your isolated product and d. a solution of your starting alcohol will be added for the bayer test, if we add a solution of potassium permanganate.

The Bayer test is utilized to recognize the presence of alcohols or phenols in a given example. The test includes adding an answer of potassium permanganate (KMnO4) to an example containing the liquor or phenol. On the off chance that a liquor or phenol is available, the purple shade of the KMnO4 arrangement will blur as it is decreased to MnO2. This response happens because of the presence of a receptive hydroxyl bunch in the liquor or phenol. The test can be performed on the beginning liquor and on the detached item after the response is finished to affirm the presence of the ideal item.

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Given what we know, we can confirm that the concentration of salt outside the cell was above 10%.

This has to do with osmosis. Osmosis is the tendency of water to move towards a place with a higher concentration of solute. This is because of water's role as a solvent. The cell in this case shrinks because the water leaves the cell to dissolve the outside salt concentration, which tells us that it must be higher than 10%.

Therefore, we can confirm that the cell shrinks because water leaves the cell to dissolve the outside salt concentration, meaning that the outside concentration of salt is higher than 10%.

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On the periodic table, argon has an average atomic weight of 39.948 amu. This number is really near 40. This suggests that Ar-40 is the isotope of argon (Ar) that is most prevalent in the natural world.

If all three argon atoms are neutral, they would each contain 18 protons and 18 electrons. In comparison to one another, the three isotopes will each have a distinct number of neutrons (18, 20, and 22 neutrons respectively).

Atomic number, not atomic mass, is used to categorise the elements. As the atomic number of argon (18) is less than that of potassium (19)

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If a balanced reaction takes place in a sealed container, how should the mass before the reaction begins compare to the mass after the reaction ends will always be equal to the reactant or same.

A balanced reaction or chemical reaction is that the amount or mass of the reactant will always be equal to the amount of the product after the reaction is complete.

If A and B are two reactant then their concentration will be equal to the product which is C and D the number of moles taking participate is also equal.

Therefore, a balanced reaction takes place in a sealed container,  the mass before the reaction begins compare to the mass after the reaction ends will be equal as reactant or will be the same.

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Answer:

29

Explanation:

Copper is a chemical element with the symbol Cu and atomic number is 29

Explanation:

Answer:

Because the interstellar medium is 97% hydrogen and 3% helium, with trace amounts of dust, etc., a star primarily burns hydrogen during its lifetime. A medium-size star will live in the hydrogen phase, called the main sequence phase, for about 50 million years. Once hydrogen fuel is gone, the star has entered “old age.”

Answer: for a star to start the process of become an old star it has to burn all the hydrogen in the star.

Explanation:

I hope this helps if not sorry :(

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The balanced equation for the acid-base reaction between H2CO3 (carbonic acid) and Sr(OH)2 (strontium hydroxide) is as follows: H2CO3 + Sr(OH)2 → SrCO3 + 2 H2O. In this reaction, carbonic acid (H2CO3) reacts with strontium hydroxide (Sr(OH)2) to produce strontium carbonate (SrCO3) and water (H2O).

The reaction is balanced with one molecule of carbonic acid reacting with one molecule of strontium hydroxide to yield one molecule of strontium carbonate and two molecules of water.
In this reaction, the acid (H2CO3) donates two protons (H+) while the base (Sr(OH)2) donates two hydroxide ions (OH-) to form water (H2O) molecules. The remaining ions, the carbonate ion (CO3^2-) from the acid and the strontium ion (Sr^2+) from the base, combine to form the insoluble salt, strontium carbonate (SrCO3). This salt precipitates out of the solution as a solid.

The balanced equation ensures that the number of atoms of each element is the same on both sides of the equation, maintaining the principle of mass conservation. Balancing the equation involves adjusting the coefficients of the reactants and products. In this case, one molecule of carbonic acid reacts with one molecule of strontium hydroxide to yield one molecule of strontium carbonate and two molecules of water.

The balanced equation shows the stoichiometry of the reaction, indicating the ratios in which the reactants combine and the products are formed.

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The pH of the solution formed by mixing 150.0 mL of 0.10 M HC₇H₅O₂ with 100.0 mL of 0.30 M NaC₇H₅O₂ and the given Ka value can be calculated using the Henderson-Hasselbalch equation. The correct answer is 4.19.

The Henderson-Hasselbalch equation is given by:

pH = pKa + log([A-]/[HA])

Where:

pH is the logarithmic scale of the hydrogen ion concentration,

pKa is the negative logarithm of the acid dissociation constant,

[A-] is the concentration of the conjugate base (acetate, C₇H₅O₂⁻), and

[HA] is the concentration of the acid (acetic acid, HC₇H₅O₂).

First, we need to determine the concentrations of the acetate ion (C₇H₅O₂⁻) and acetic acid (HC₇H₅O₂) in the final solution after mixing.

The initial moles of HC₇H₅O₂ are:

moles_HC₇H₅O₂ = volume_HC₇H₅O₂ × concentration_HC₇H₅O₂

            = 150.0 mL × 0.10 M

            = 15.0 mmol

The initial moles of NaC₇H₅O₂ are:

moles_NaC₇H₅O₂ = volume_NaC₇H₅O₂ × concentration_NaC₇H₅O₂

             = 100.0 mL × 0.30 M

             = 30.0 mmol

Since the reaction between HC₇H₅O₂ and NaC₇H₅O₂ is a 1:1 ratio, the moles of HC₇H₅O₂ remaining after reaction will be equal to the moles of NaC₇H₅O₂ reacted. Therefore, the final concentration of HC₇H₅O₂ will be (15.0 - 30.0) mmol.

Next, we can calculate the concentration of the acetate ion (C₇H₅O₂⁻) by adding the moles of NaC₇H₅O₂ and the remaining moles of HC₇H₅O₂ and dividing by the total volume:

concentration_A- = (moles_NaC₇H₅O₂ + moles_HC₇H₅O₂ remaining) / (volume_NaC₇H₅O₂ + volume_HC₇H₅O₂)

                = (30.0 mmol + (15.0 - 30.0) mmol) / (100.0 mL + 150.0 mL)

                = 15.0 mmol / 250.0 mL

                = 0.06 M

The concentration of the acid (acetic acid, HC₇H₅O₂) can be calculated using the remaining moles and the total volume:

concentration_HA = moles_HC₇H₅O₂ remaining / (volume_NaC₇H₅O₂ + volume_HC₇H₅O₂)

                = (15.0 - 30.0) mmol / (100.0 mL + 150.0 mL)

                = -15.0 mmol / 250.0 mL

                = -0.06 M

(Note: The negative sign indicates that the concentration

is less than 0 M, which is expected since some of the acid has reacted.)

Now, we can substitute the values into the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

  = \(-\log(6.5 \times 10^{-5}) + \log(0.06 / 0.06)\)

  = -(-4.19) + \log(1)

  = 4.19 + 0

  = 4.19

Therefore, the pH of the solution formed by mixing the two solutions is 4.19.

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Mole ratio is the conversion factor used to convert from moles of substance A to moles of substance B (option C).

Mole ratio is a ratio of the number of moles of one substance to the number of moles of another substance in a balanced chemical equation.

It allows us to convert between moles of different substances involved in a chemical reaction. Molar mass (A), Avogadro's number (B), and the mass of 1 mole (D) can be used to convert between moles and other units, such as mass and number of particles.

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Answer:

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

\(P_1V_1 = P_2V_2\)

Since we're finding the new pressure

\(P_2 = \frac{P_1V_1}{V_2} \\\)

We have

\(P_2 = \frac{0.5 \times 150}{75} = \frac{75}{75} = 1 \\ \)

We have the final answer as

Hope this helps you

Answer:

Large leaves help plants to receive more sunlight when in tropical rainforests.

Answer:

12.044 x  \(10^{23}\) molecules

Explanation:

Molar Mass of CO = 12g + 16 g = 28g

No. of moles in 52g CO = Mass / Molar Mass  = 52/28 = 2 moles

No. of Molecules in 1 mole = 6.022 x \(10^{23}\)

So, no. of molecules in 2 moles = 2 x 6.022 x  \(10^{23}\) = 12.044 x  \(10^{23}\)

Answer:

Lead(IV) Carbonate Pb(CO3)2 Molar Mass, Molecular Weight

Explanation:

Complete Question

What is the name of Pb(CO3)2

We have that the name of Pb(CO3)2 is Lead Carbonate

Since Lead is a transition metal

From the question we are told

What is the name of Pb(CO3)2

Generally The compound divide into two distinct segements

Pb= Lead

CO_3=Carbon trioxide

Given that CO3 is the carbonate ion and a poly atomic ion

Since Lead is a transition metal we have that the name of the Compound is

Lead Carbonate

Hence

the name of Pb(CO3)2 is Lead Carbonate

Since Lead is a transition metal

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Answer:

trial 1

Explanation:

trust

The structure of an electron could not be seen by using an electron microscope.

An electron is a  small particle having a negative charge that is found in all the atoms. Streams of electrons made by special equipment which can be used for the radiation treatment.

An electron microscope is a microscope which uses a beam of accelerated electrons as a source of illumination. As the wavelength of an electron can be up to 100,000 times shorter than the visible light photons, electron microscopes having higher resolving power than to the light microscopes and can reveal the structure of the smaller objects. Electron microscopes use shaped magnetic fields to form an electron optical lens systems that are analogous to the glass lenses of an optical light microscope.

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Answer:

\(1 \: mole = 6.02 \times {10}^{23} \: molecules \\ 4 \: moles = (4 \times 6.02 \times {10}^{23} ) \: molecules \\ = 2.408 \times {10}^{24} \: molecules\)

Answer:

When you are going to measure small lengths or objects or when you are going to measure things with great accuracy.

Explanation:

Answer:

the answer is A.

i think:/

Explanation:

Reaction 1, which has a low activation energy and a higher concentration of reactants, will be faster when the reactants are first mixed compared to Reaction 2, which has a higher activation energy and a lower concentration of reactants.

The rate of a chemical reaction is influenced by various factors, including the activation energy and the concentration of reactants. In this case, Reaction 1 has a low activation energy, indicating that less energy is required for the reaction to proceed. Additionally, Reaction 1 has a higher concentration of reactants, which means there are more reactant molecules available for collisions.

Both a low activation energy and a higher reactant concentration contribute to a faster reaction rate. On the other hand, Reaction 2 has a higher activation energy and a lower concentration of reactants, which will result in a slower reaction rate compared to Reaction 1.

Therefore, when the reactants for each reaction are first mixed, Reaction 1 will be faster due to its lower activation energy and higher concentration of reactants.

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The 3.5 L of gas sample at the temperature 120ºC and 1.4atm. If increase the pressure to 4.7 atm and then cool the it to 50ºC. The final volume of the sample is 0.85 L.

The initial volume , V1 = 3.5 L

The initial temperature, T1 =  120ºC = 393 K

The initial pressure,P1 = 1.4 atm

The final pressure , P2 = 4.7 atm

The final temperature, T2 = 50ºC = 323 K

The final volume , V2 = ?

The gas law is expressed as :

P1 V1 / T1 = P2 V2 / T2

(1.4 × 3.5 ) / 393 = ( 4.7 × V2 ) /323

0.0124 = ( 4.7 × V2 ) /323

4 =  ( 4.7 × V2 )

V2 = 0.85 L

Thus, the final volume is 0.85 L.

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