PLEASE HELP 50 POINTS ASAP!!! REAL ANSWERS ONLY OR DELETED!

Answer

1 mole Al= 27gm

6.022X10^23 atoms of Al=27 gm

1 atom Al=( 27/6.022X10^23)gm

100 atom Al= (27/6.022X10^23) X 100 gm

= 4.4835 X 100 X 10^-23

= 4.4835X( 10^-21) gram====>>answer

Answer:

C.) the idea that items like electrons can be described as both a particle and a wave

Answer:

A state of balance in which the rates of the forward and reverse reactions are equal.

Explanation:

The dynamic equilibrium is a state of balance in which the rates of the forward and reverse reactions are equal, like we can see in the following drawing:

And the concentration of the reactants and products become stable in time.

Answer: A state of balance in which the rates of the forward and reverse reactions are equal.

Explanation:

chemical equilibrium is the state in which both the reactants and products are present in concentrations which have no further tendency to change with time.

Taking into account the reaction stoichiometry, 2.95 grams of MgO from 1.78 g of Mg and 2.36 g of O₂.

In first place, the balanced reaction is:

2 Mg + O₂  → 2 MgO

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 32 grams of O₂ reacts with 48.62 grams of Mg, 2.36 grams of O₂ reacts with how much mass of Mg?

mass of Mg= (2.36 grams of O₂× 48.62 grams of Mg)÷ 32 grams of O₂

mass of Mg= 3.586 grams

But 3.586 grams of Mg are not available, 1.78 grams are available. Since you have less mass than you need to react with 2.36 grams of O₂, Mg will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 48.62 grams of Mg form 80.62 grams of MgO, 1.78 grams of Mg form how much mass of MgO?

mass of MgO= (1.78 grams of Mg× 80.62 grams of MgO)÷ 48.62 grams of Mg

mass of MgO= 2.95 grams

Finally, 2.95 grams of MgO can be produced.

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Whenever we have a solution with a solvent like water, and a solute that is dissolved in water, we can identify this dissolved solution as an aqueous solution, therefore the symbol will be (aq), letter D

To solve this problem, we're going to use the formula of molarity:

We have to find the number of moles in 106 g of Na. The molar mass of Na can be found in the periodic table, which is 23 g/mol. The conversion would be:

Finally, we replace the moles (4.61 moles) and the liters of solution (6.00 L) in the formula:

The molarity of the solution would be 0.768 M.

Based on the mole ratio from the reaction, the number of moles of Zn(NO₃)₂ that can be formed in the reaction is 3 moles.

The number of moles of Zn(NO₃)₂ that can be formed in the reaction is determined from the mole ratio of the reaction in the given data.

Equation of the reaction:

2 AgNO₃ (aq) + Zn (s) ----> Zn(NO₃)₂ (aq) + 2 Ag (s)

From the data provided, 7.0 mol AgNO₃ can form 3.5 mol Zn(NO₃)₂.

The mole ratio of  AgNO₃ can form 3.5 mol Zn(NO₃)₂; mole ratio is 2: 1

Also, 3.0 mol Zn can form 3.0 mol 3.5 mol Zn(NO₃)₂; mole ratio is 1 : 1

Mole ratio of AgNO₃ (aq) to Zn (s) is 2 : 1

The limiting reagent is Z

Moles of Zn(NO₃)₂ formed = moles of Zn reacted

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Answer: 3.0

..............................

The average atomic mass of an element is calculated by multiplying the masses of all of its isotopes by the element's natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope)

Explanation: The Periodic Table's referenced atomic mass is the WEIGHTED average of each isotopic mass. The more that isotope contributes to the isotopic mass, the larger its isotopic percentage. Because of this, non-integral masses make up the majority of the masses stated on the Table.

Divide each percentage of abundance into decimal form Multiply this number by the isotope's atomic mass, which is 100. To get the average atomic mass for each isotope, add everything up.

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Considering the definition of percentage by mass, the mass of water in a 23.5 % solution containing 15.9 g of potassium chlorate is 50.63 grams.

The percentage by mass expresses the concentration and is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:

percentage by mass= (mass of solute÷ mass of solution)× 100%

In this case, you know:

Replacing in the definition of percentage by mass:

23.5%= (15.9 grams÷ mass of solution)× 100%

Solving:

23.5%÷ 100%=15.9 grams÷ mass of solution

0.235= 15.9 grams÷ mass of solution

0.235× mass of solution= 15.9 grams

mass of solution= 15.9 grams÷ 0.235

mass of solution= 66.53 grams

Considering that the mass of solution is the sum of mass of solute and mass of water, the mass of water can be calculated as:

mass of solution= mass of solute + mass of water

66.53 grams= 15.9 grams + mass of water

66.53 grams- 15.9 grams= mass of water

50.63 grams= mass of water

Finally, the mass of water is 50.63 grams.

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The following substances are classified as

1. Chicken Noodle Soup is heterogeneous mixture. 2. Salt (NaCl) is Pure Substance. 3. Concrete is a heterogeneous mixture. 4. Vegetable Oil is homogeneous mixture. 5. Air is Homogeneous mixture. 6. Paint is Heterogeneous mixture. 7. Sea water is Homogeneous mixture. 8. Alcohol is Pure Substance. 9. Steel is Homogeneous mixture. 10. Sugar is Homogeneous mixture.

Pure substance are defined as the substance which has a constant or fixed chemical composition throughout.

Homogeneous mixture is defined as the mixture in which the components are mixed up with the same appearance and uniformly throughout the mixture.

Heterogeneous mixture is defined as the mixture in which the composition is not uniform throughout the mixture.

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Molarity or molar concentration is a measure of the concentration of a chemical species, of a solute in a solution, using as units, number of moles, and volume in liters. The formula for Molarity is:

M = n/V

Where:

n = number of moles, 3 moles

V = volume in Liters, 6 Liters

Now adding these values into the formula:

M = 3/6

M = 0.500 M is the molarity or molar concentration, 2nd option

Answer:

Explanation:

Here, we want to get the pressure occupied by the gas under the given conditions

We can use the ideal gas equation here

Mathematically, we have this as:

P is the pressure which we want to calculate

V is the volume occupied by the gas given as 42.5 L

n is the number of moles, given as 1.52 moles

R is the molar gas constant which is :

T is the temperature which we have to convert to absolute temperature scale (Kelvin) by adding 273.15 K to the Celsius temperature

Let us rewrite the equation in terms of the Pressure, which we want to calculate

We have this as:

Finally, we proceed to substitute the values given above:

Uranium-238

The process by which an atomic nucleus looses energy by radiation is known as radioactivity.

An alpha particle, have an atomic number of 2 and a mass number of 4 as shown;

When this is combined with Th-234, it forms Uranium-238. This shows that the uranium nucleus emits alpha particle to form Th-234 according to the chemical equation below;

Natural gas power plants focus on using non-renewable energy resources.

Found in subterranean layers of rocks and sediments. Pressure and heat worked together to transform plant and animal debris into crude oil also known as petroleum coal, and natural gas. Our energy supply comes primarily from fossil fuels, with nuclear power and renewables rounding out the whole. These sources mainly come from our nearby star the Sun. Electricity falls into its own category because it is an energy medium and not a primary source.

Non-renewable energy resources are limited because they usually take time to replenish. The advantage of these non-renewable resources is that the power plants that use them can produce more electricity on demand. A non-renewable energy resource is a coal. Non-renewable energy is an energy source that will eventually run out. Most non-renewable energy sources are fossil fuels such as coal gas, and oil.

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Answer:natural gas powerplant

Explanation: because

The minimum mass of hydrochloric acid that could be left over by the

chemical reaction, is nearly 12.0 grams.

According to given reaction is :

HCl +NAOH --> NaCl + H2O

mass of HCl = 35 g

molar mass of HCl=36.46 g/mol

moles of HCl present = 35 g/36.46 g/mol =0.466 moles

mass of NaOH = 6.44 g

molar mass of NaOH= 40 g/mol

moles of NaOH present = 28.7 g/40g/mol = 0.161 moles

Moles of HCl is more than that of NaOH. Hence limiting reactant is NaOH

It will consume completely

mole ratio HCl : NaOH= 1:1

thus moles of HCL consumed  = moles of NaOH present =0.141 moles

moles of HCl remaining = 0.466 moles- 0.141 moles = 0.325 moles

molar mass of HCl= 36.46 g/mol

mass of HCl remaining = moles of HCl remaining* molar mass

= 0.325 mol *36.46  g/mol = 11.84 g

after rounding

mass  = 12.0 g

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The capable of dipole-dipole interactions is H₂CO

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The theoretical yield is 0.0395 moles of carbon dioxide while the percent yield is  608%

We know that we can be able to obtain the theoretical yield of the reaction from the equation of the reaction and by the use of stoichiometry. We need to know the limiting reactant.

Number of moles of pentane =  5.679 g/72 g/mol = 0.0079 moles

Number of moles of CO2 =  10.42 g/44.01 g/mol = 0.24 moles

If 1 mole of pentane yields 5 moles of CO2

0.0079 moles of pentane yields 0.0079 moles  * 5 moles/1 mole

=0.0395 moles or 1.738 g

Hence the percent yield of the CO2 is;

0.24 moles/0.0395 moles * 100/1

= 608%

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Answer:

Mitosis has four basic phases.

1. prophase

2.metaphase

3.anaphase

4.telephase

Occurs in a strict sequential order called the cell cycle

Produces two identical daughter cells (2) same genetic makeup as the parent cell.

Explanation:

:)

The density is 5g/cm³ and the cube is not gold and i will not buy it

Density is the mass of the object divided by its volume gives the density of the object

Here given data is

Mass = 40g

Volume of cube = 2cm

Volume = 2³

Volume = 2×2×2cm³

Volume = 8cm³

Density of cube = ?

Then formula of density is

Density = mass/volume

Density of cube =  40g/ 8cm³ = 5g/cm³

Therefore, the given gold has density = 19.3 g/cm³ and cube density is less than of gold so cube is not a gold and i will not buy it

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1) Balance the chemical equation.

2) List the elements in the reactant and in the products.

Reactants:

C: 1

H: 4

O: 3

Products:

C: 1

H: 2

O: 3

BalanceH.

Reactants:

C: 1

H: 4

O: 3

Products:

C: 1

H: 4

O: 4

Balance oxygen

Multiply every coefficient by the denominator

Reactants:

C: 2

H: 8

O: 8

Products:

C: 2

H: 8

O: 8

3) Moles of CH3OH needed to produce 3 mol CO2.

The molar ratio between CH3OH and CO2 is 2 mol CH3OH: 2 mol CO2.

The moles of CH3OH needed are 3 mol.

.

The forces affecting the plane are unbalanced. There is a net force in the forwarding direction.

A force is an influence that can exchange the movement of an object. Pressure can cause an item with mass to exchange its velocity, i.e., to accelerate. the force also can be described intuitively as a push or a pull. A pressure has each importance and direction, making it a vector quantity.

The internet force is the vector sum of forces appearing on a particle or object. The internet force is a single force that replaces the impact of the unique forces on the particle's movement.

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The partial pressure of N₂ in the mixture containing He, Ar with a total pressure of 21 atm is 11,746 torr.

It is given that the mixture contains He with a partial pressure of 2427 torrs, Ar with 1787torres (1mmHg = 1 torr) and the total partial pressure is given by 21 atm (1atm = 760torr) which is 15960 torr.

To find the partial pressure of N₂, by using Dalton's atomic theory,

P total = Partial pressure of Ar + Partial pressure of He + Partial pressure of N₂

15960 = 1787 + 2427 + Partial pressure of N₂

Partial pressure of N₂ = 15960 - 4214

Partial pressure of N₂ = 11,746 torr

Therefore, the partial pressure of N₂ is 11,746 torr.

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Temperature of the sample helium with an root-mean-square velocity of 450.0 m/s is 32.47K

The value of the square root of the sum of the squares of the stacking velocity values divided by the number of values is the root-mean square (rms) velocity.

As we know, from Maxwell's speed distribution, the rms speed of velocity of gas is given by,

[tex]V_{rms}[/tex] = [tex]\sqrt{3RT/M}[/tex]

450 = [tex]\sqrt{(3*8.3145*T)/4*10^{-3} }[/tex]       [ Mass of helium = 4.00 u]

T = 32.47 K

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Answer

Explanation

A is wrong because vaporization, conversion of a substance from the liquid to gas, not the other way round.

B is correct because sublimation is the transition from the solid phase to the gas phase without passing through an intermediate liquid phase.

C is correct because boiling is the process by which a liquid turns into a vapor/gas when it is heated to its boiling point.

D is correct because condensation is the change from a vapor to a condensed state

Answer:

D:nitrogen

Explanation:

Nitrogen is a waste product that your kidneys remove from your blood.

Explanation:

We have to find the volume of a 1.5 M solution of HCl that we can make with 45 g of HCl.

The molarity of a solution is defined like this:

Molarity = moles of solute/(volume of solution in L)

We already know the molar concentration and the volume is our unknown.

volume = ?

molarity = 1.5 M

The solute of our solution is going to be HCl and we can convert the grams of it into moles using its molar mass.

molar mass of H = 1.01 g/mol

molar mass of Cl = 35.45 g/mol

molar mass of HCl = 1 * 1.01 g/mol + 1 * 35.45 g/mol

molar mass of HCl = 36.46 g/mol

moles of HCl = 45 g * 1 mol/(36.46 g)

moles of HCl = 1.23 mol

Finally we can replace these values in the molarity formula and solve it for the volume to get the answer to our problem.

Molarity = moles of HCl/(volume of solution)

volume of solution = moles of HCl/(molarity)

volume of solution = 1.23 moles/(1.5 M)

volume of solution = 0.82 L

Answer: We will need to use 0.82 L.

Answer:

0.375 J/g°C

Brass

Explanation:

To identify the unknown metal, you first need to calculate the specific heat capacity using the following equation:

Q = mcΔT

In this equation,

-----> Q = heat energy (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = change in temperature (°C)

You can find the specific heat capacity by plugging the given values into the equation and simplifying to find "c".

Q = 150 J                        c = ? J/g°C

m = 20.0 g                     ΔT = 50°C - 30°C = 20°C

Q = mcΔT                                           <----- Given equation

150 J = (20.0 g)c(20°C)                      <----- Insert values

150 J = (400 g°C)c                             <----- Multiply 20.0 g and 20°C

0.375 J/g°C = c                                  <----- Divide both sides by 400 g°C

The specific heat capacity of the unknown metal is 0.375 J/g°C. According to my research, there is no metal with this exact specific heat capacity. However, the closest I could find was brass (0.377 J/g°C).

Answer:

Explanation:

Here, we want to get the mass of silver(I) dichromate needed

Firstly, we need to get the number of moles of Tin(I) Hydrogen Carbonate used up

To get this, we have to divide the mass used up, by the molar mass

The molar mass of Tin(I) Hydrogen Carbonate is 241 g/mol

Mathematically:

We have the number of moles as:

From the equation of reaction, 1 mole of Tin hydrogen carbonate used 1 mole of silver dichromate

That means 0.1473 mole of the carbonate will also use 0.1473 mole of the dichromate

Now, to get the mass of the dichromate, we have to multiply the number of moles by the molar mass of the dichromate

The molar mass of the dichromate is 432 g/mol

Thus, we have the mass used up as:

A given element must have the same number of protons as neutrons and electrons, this is not a requirement. No other element has an atom with two protons besides helium, which has two protons in every atom.

An electrical force keeps electrons in their shells. An atom's protons and electrons are drawn to one another. They are both electrically charged. Electrons have a negative charge (-), while protons have a positive charge (+).

Electrons are present outside the atom's nucleus, in contrast to protons and neutrons, which are contained inside the nucleus at its center. Negative electrons are drawn to the positive nucleus because the electric charges of opposite polarity attract one another.

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The complete question is -

Does a given element always have the same number of each particle? Why or why not? Using periodic table, give some specific examples.