How many moles are in 7.777x 10^24 molecules of Mg2. Watch your significant
figures

The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

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Answer:

physical

Explanation:

The zinc (which was already silver) coated the penny. The NaOH dissolved the zinc. (that was what made the water murky) And small pieces of zinc adhered to the penny (coated) It was a physical change because no NEW color was created.

Answer:

c,b not sure,c,v,b hope it will help u

The species that exhibit resonance are NO3–, SO3^2–, and PO3^3–.

Resonance refers to the delocalization of electrons within a molecule, resulting in multiple resonance structures. In NO3– (nitrate ion), the three oxygen atoms form a resonance hybrid, with the negative charge spread over the entire molecule.

Similarly, in SO3^2– (sulfite ion), the sulfur atom shares its electrons with three oxygen atoms, resulting in resonance structures. Lastly, in PO3^3– (phosphite ion), the phosphorus atom forms resonance structures by sharing electrons with three oxygen atoms.

Resonance stabilizes the molecules by distributing the charge or electron density more evenly, making them more stable and less reactive. Therefore, the correct answer is E) NO3–, SO3^2–, and PO3^3–.

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Explanation:

The chocolate or wax in the activity can be compared to the tectonic plates on the surface of the Earth. Just like the tectonic plates, the chocolate or wax is made up of different layers that move and interact with each other. The movement of the tectonic plates is driven by convection currents in the mantle, which is the layer of the Earth beneath the crust. These convection currents are caused by differences in density between the hot, less dense material near the core of the Earth and the cooler, more dense material near the surface. Similarly, the movement of the chocolate or wax is driven by the heat from the flame, which causes the less dense, melted chocolate or wax to rise and the more dense, solid chocolate or wax to sink.

The balanced net ionic equation for the reaction in the given case is: Pb(s) + 2 Ag+(aq) -> Pb2+(aq) + 2 Ag(s)

In the given reaction, a galvanic cell is set up with two half-cells. The left half-cell consists of a solid lead (Pb) electrode in a solution of lead(II) nitrate (Pb(NO3)2), while the right half-cell consists of a silver nitrate (AgNO3) solution with a silver (Ag) electrode.

The vertical lines indicate the phase boundaries, and the double vertical line represents the salt bridge.

In the anode half-cell (left), lead metal (Pb) undergoes oxidation and loses two electrons to form lead(II) ions (Pb2+):

Pb(s) -> Pb2+(aq) + 2e-

In the cathode half-cell (right), silver ions (Ag+) from the silver nitrate solution are reduced and gain two electrons to form solid silver (Ag):

2 Ag+(aq) + 2e- -> 2 Ag(s)

The balanced net ionic equation is obtained by canceling out the electrons on both sides and writing the overall reaction:

Pb(s) + 2 Ag+(aq) -> Pb2+(aq) + 2 Ag(s)

This represents the transfer of electrons from lead to silver, resulting in the reduction of silver ions and the oxidation of lead metal.

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Answer:

The sum of given measurements is 1007 L.

Explanation:

The given measurements are 28 L, 42 L, 6 L, and 931 L.

We need to find the total of these measurements.

Total = 28 L + 42 L + 6 L + 931 L

It can be written as

Total = ( 28 +42+6+931)

One simplification we get Total = 1007 L

Answer:

Explanation:

A biography is a specialized form of history. It is an account of events based upon the example of one person's life. There are four basic types of biographies: historical fiction, academic, fictional academic, and the prophetic biography.

Answer: Mass remains constant

Explanation:

We must apply the following equation:

\(n=\dfrac{m}{M}\)

We're given:

Apply the equation:

\(n=\dfrac{m}{M}\)

\(n=\dfrac{15.89}{16.04}\)

\(n = 0.9906\hspace{4}mol\)

0.9906 mol

1. The expected theoretical rate of diffusion of Cl- can be calculated based on its molecular weight using Graham's Law of Diffusion. Graham's Law states that the rate of diffusion of a gas is inversely proportional to the square root of its molecular weight. While Cl- is not a gas, the same principle can be applied to its diffusion through a liquid or a membrane.

The molecular weight of Cl- is approximately 35.5 g/mol. If we compare it to the molecular weight of a hypothetical gas with a molecular weight of 1 g/mol (used as a reference), we can calculate the expected rate of diffusion of Cl- as follows:

Rate of diffusion of Cl- = (Molecular weight of reference gas / Molecular weight of Cl-)^(1/2)

Rate of diffusion of Cl- = (1 / 35.5)^(1/2) = 0.188

Therefore, the expected theoretical rate of diffusion of Cl- is approximately 0.188 times the rate of diffusion of the reference gas.

2. Similar to Cl-, the expected theoretical rate of diffusion of Br- can also be calculated based on its molecular weight using Graham's Law. The molecular weight of Br- is approximately 80 g/mol. Using the same equation as before, we get:

Rate of diffusion of Br- = (Molecular weight of reference gas / Molecular weight of Br-)^(1/2)

Rate of diffusion of Br- = (1 / 80)^(1/2) = 0.125

Therefore, the expected theoretical rate of diffusion of Br- is approximately 0.125 times the rate of diffusion of the reference gas.

3. The fact that the rate of transport of a substance into a cell is drastically reduced when the formation of ATP is blocked suggests that the transport system must be a form of active transport. Active transport requires the input of energy (in this case, ATP) to move substances against their concentration gradient, from an area of low concentration to an area of high concentration. This process is in contrast to passive transport, which does not require energy and moves substances down their concentration gradient, from an area of high concentration to an area of low concentration.

4. To calculate the rate of diffusion of ferricyanide, we need to use the formula:

Rate of diffusion = Distance traveled / Time taken

We can use the distance between the outer edge of the ferricyanide well and the precipitation band, divided by the distance from the Ag well to the precipitation band with ferricyanide to calculate the rate of diffusion of ferricyanide. However, we are not provided with the time taken for the diffusion.

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Answer:

nose

Explanation:

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, the wavelength of light is 2.41×10⁻⁷m.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.

There is a relation between frequency of wave, and wavelength of wave

Mathematically,

ν=c÷λ

where,

ν=frequency of light=1.24 x10¹⁵s⁻¹

c is speed of light that is 3×10⁸m/s

λ is the wavelength of light=?

Substituting all the values

1.24 x10¹⁵s⁻¹=3×10⁸m/s÷λ

λ= 2.41×10⁻⁷m

Therefore, the wavelength of light is 2.41×10⁻⁷m.

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10.0 tonnes of TiO₂ can be produced at most from 19.0 tonnes of the mineral ilmenite, FeTiO₃. The first option is correct.

Utilizing the "mole concept," we may determine the mass of chemical substances according to the situation. A mole is a precise unit of measurement for the number of atoms or molecules in a large sample of the substance. It is the amount of a substance that includes precisely the Avogadro number of the substance's "elementary entities". It is practical to express the quantity of a substance using the mole concept.

For the given situation, first, write the complete equation,

\(\mathrm{FeTiO_3\longrightarrow FeO+TiO_2}\)

Then, the mole concept is introduced as,

\(\begin{aligned}\mathrm{\frac{mole\;of\;TiO_2}{mole\;of\;FeTiO_3}}&=\frac{1}{1}\\\mathrm{mole\;of\;TiO_2}&=\mathrm{mole\;of\;FeTiO_3}\\\mathrm{\frac{m_{TiO_2}}{79.9}}&=\frac{19.0}{151.7}\\\mathrm{m_{TiO_2}}&=\frac{79.9\times19.0}{151.7}\\&=\mathrm{10.00\;tonnes}\end{aligned}\)

The required answer is 10.0 tonnes.

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Answer:

0.086

Explanation:

got it on acellus

The mass of the dry solute recovered from the given data is 0.086 g.  Option C

To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.

Given the data provided:

Boat Mass: 0.730 g

Boat + Solution: 0.929 g

Boat + Dry: 0.816 g

To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:

Mass of Dry Solute = (Boat + Dry) - (Boat Mass)

Mass of Dry Solute = 0.816 g - 0.730 g

Mass of Dry Solute = 0.086 g

Therefore, the correct answer is c) 0.086 g.

The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.

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D. Al of the following is a reactant in the chemical equation

In a chemical equation, the substance or substances to the left of the arrow are referred to as reactants. A material that is present when a chemical reaction first begins is known as a reactant. Products refer to the material or substances to the right of the arrow. A material that is present following a chemical reaction is known as a product.

Methane (CH4) and oxygen (O2) are the reactants and carbon dioxide (CO2) and water are the products in this chemical process. (H2O). This illustration demonstrates that chemical bonds may form and break during a chemical process. The forces that keep the atoms of a molecule together are known as chemical bonds.

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Answer: D

Explanation:

if two atoms have the same number of protons, but different numbers of neutrons we refer to them as isotopes.

Isotopes have the same nom of protons ( atomic number ) and electrons , but they have different no. of neutrons , they aslo have different mass no ; since mass no equals to protons + neutrons .

PLEASE GIVE BRAINLIEST

Answer: electrons

Explanation:

electrons are attracted to the nucleus by the charge of the protons. To get past this force, one would need to add energy. Ionization energy increases to the right and up (according to the periodic table trends) because there are more protons as you move across a period, making it harder to take an electron.

Answer:

? which gas, explain further

Explanation:

Calcium carbonate (CaCo3) is a white solid and gaseous with the density of 2.71 g/cm^3 that can be easily calculated or observed without a chemical reaction, so it is simply a physical property.

Now the second sentence says that it reacts readily with an acid to produce gaseous carbon dioxide.

Let's take a chemical reaction:

CaCO3( Calcium Carbonate) + 2HCl (Hydrochloric Acid) ----> CaCl2 (Calcium Chloride) + CO2 (Carbon Dioxide) + H2O (Water)

Hence it readily reacts with acids so it is clearly a chemical change and falls into chemical property.

Physical properties denote or comprises density, color, melting and boiling point where as chemical properties comprises of it goes in a particular chemical reaction and changes.

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The different types of the elements does she have available to study are :

Hydrogen, Phosphorus , Oxygen, Carbon, Magnesium, Sulphur, Potassium, Chlorine.

1) The chemical formula of the phosphoric acid is : H₃PO₄

Elements : Hydrogen, phosphorus, oxygen

2) The chemical formula of the glucose is : C₆H₁₂O₆

Elements : Carbon, Hydrogen, oxygen

3) The chemical formula of the Epsom salts  is : MgSO₄

Elements : Magnesium, Sulfur, Oxygen

4) The chemical formula of the chlorate of potash is : KClO₃

Elements : Potassium, Chlorine and Oxygen.

Thus, the Hydrogen, Phosphorus , Oxygen, Carbon, Magnesium, Sulphur, Potassium, Chlorine are the different elements to study.

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Answer:

b

Explanation:

Answer:

append()

Explanation:

just took this test, chose this answer, and got it correct

Answer:

d

Explanation:

I guess it is a small world cuz i doing the test on flvs to

hope this helps

Answer:

hydrogen

Explanation:

hydrogen has 1 proton, 0 neutrons and one electron

Answer:

There is only one stable atom that does not have neutrons.

Explanation:

a. The products formed when an ester is hydrolyzed with water and H₂SO₄ are an alcohol and a carboxylic acid.

b. The greater product is carboxylic acid and the lesser product is the original ester.

The alcohol formed has a lower molecular weight than the original ester, as it is missing the carboxylic acid group. The carboxylic acid formed has a greater molecular weight than the original ester, as it is now carrying an additional hydroxyl group. For example, if ethyl acetate is hydrolyzed with water and H₂SO₄, the products formed are ethanol and acetic acid. Ethanol has a lower molecular weight (46 g/mol) than ethyl acetate (88 g/mol), while acetic acid has a greater molecular weight (60 g/mol) than ethyl acetate.

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Answer:

Proportion : The Equality of two ratios

Equation:  Values of two mathematical expressions are equal.

Formula: Mathematical relationship or rule expressed in symbols.

Explanation:

Taking into account the definition of calorimetry, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.

In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of heat that a body can receive or give up without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gaseous) does not change. Since the molecular structure does not change, a change in temperature is observed.

In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

1800 J= 4.18\(\frac{J}{gC}\)× 5 g× ΔT

Solving:

1800 J ÷ (4.18\(\frac{J}{gC}\)× 5 g)= ΔT

ΔT= 86.12 C

In summary, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.

Learn more:

Explanation:

mole number =mass/molar mass

mass=mole number × molar mass

mass= (volume of gas/volume at stp)molar mass

mass=(2.15/22.4)28

mass=2.69g

pls give brainliest

Answer:

your answer is C I believe