need answer ASAP PLEASE!!
A container of oxygen gas has a volume of 145.6 L. If the pressure of the gas is
101.3 kPa and the temperature is 0 °C, determine the amount of oxygen gas in the
container. [ans: 6.50 mol]

The molar mass of aluminum sulfate is 342.15 g/mol.

To find the number of moles in the solution, we first need to calculate the mass of aluminum sulfate present in 1 liter of the solution:

0.284 g/L x 1 L = 0.284 g

Then we can find the number of moles:

0.284 g / 342.15 g/mol = 0.000829 moles

Since we only have 396 mL of the solution, we need to adjust the number of moles accordingly:

0.000829 moles/L x 0.396 L = 0.000328 moles

Aluminum sulfate dissociates in water to form 3 ions: one aluminum ion (Al3+) and two sulfate ions (SO42-).

So for every 1 mole of aluminum sulfate dissolved, we get 1 mole of Al3+ ions and 2 moles of SO42- ions.

Therefore, in 0.000328 moles of aluminum sulfate, we have:

0.000328 moles of Al3+ ions

0.000656 moles of SO42- ions

To find the number of ions of each type, we can use Avogadro's number, which tells us the number of particles (ions, atoms, molecules) in 1 mole of a substance:

Number of Al3+ ions: 0.000328 moles x 6.022 x 10^23 ions/mol = 1.97 x 10^20 ions

Number of SO42- ions: 0.000656 moles x 6.022 x 10^23 ions/mol = 3.95 x 10^20 ions

Therefore, there are approximately 1.97 x 10^20 aluminum ions and 3.95 x 10^20 sulfate ions in 396 mL of 0.284 g/L aluminum sulfate solution.

Answer:

The strong forces oppose the electromagnetic force of repulsion between protons. Like ”glue” the strong force keeps the protons together to form the nucleus. The strong forces and electromagnetic forces both hold the atom together.

Explanation:

Hope This helps

Answer:

The strong forces oppose the electromagnetic force of repulsion between protons.

Answer:

c

Explanation:

Connect with the world to the world of the world and the world of the world and

Answer:

At T = 77k, V = 2.69m/a

At T = 1500K, V = 11.86m/s

Explanation:

Hello,

We're required to find the root mean speed (RMS) of a gas and to do that, we'll have to relate the energy of a gas and its kinetic energy

Ek = 3/2 RT

Ek = ½mv²

½mv² = 3/2 RT

Solve for V

MV² = 3RT

V² = 3RT / M

V = √(3RT/M)

V = velocity or speed of the gas

R = ideal gas constant

T = temperature of the gas

M = molarmass mass of the gas

Molar mass of CH4 = 12 + 4 = 16g/mol

At T = 77k

V = √[((3/2) × 77) / 16]

V = √7.216

V = 2.69m/s

At T = 1500K

V = √[((3/2) × 1500) / 16]

V = √140.625

V = 11.86m/s

Units of the SI System

There are seven base units in the SI system:

the kilogram (kg), for mass

the second (s), for time

the kelvin (K), for temperature

the ampere (A), for electric current

the mole (mol), for the amount of a substance

the candela (cd), for luminous intensity

the meter (m), for distance

Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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They appear as the trait over a recessive allele. Statement C) is true about the dominant alleles.

Dominant alleles are genetic variants that, when present in an individual's genotype, are expressed phenotypically, meaning they determine the visible or observable traits. Dominant alleles are represented by capital letters, while recessive alleles are represented by lowercase letters in genetics.

In terms of inheritance, if an individual has at least one copy of the dominant allele, it will be expressed in the phenotype, regardless of the presence of a recessive allele. This is because dominant alleles exert their influence over recessive alleles, thus "dominating" their expression.

To illustrate this, let's consider a specific example using a trait controlled by a single gene with two possible alleles: dominant (A) and recessive (a). If an individual is homozygous dominant (AA), meaning they possess two copies of the dominant allele, the dominant trait will be expressed.

However, if an individual is homozygous recessive (aa), with two copies of the recessive allele, the recessive trait will be expressed since there are no dominant alleles to override it.

Therefore, dominant alleles appear as the trait over recessive alleles, regardless of the presence or absence of a recessive allele. The presence of even a single copy of the dominant allele is sufficient for its expression in the phenotype. Option C

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Answer:

Left over mass of hydrogen = 0.06 g

Mass of HCl produced = 12.41 g

Explanation:

Given data:

Mass of H₂ = 0.40 g

Mass of Cl₂ = 12.35 g

Mass of left over reactant = ?

Mass of HCl produced = ?

Solution:

Chemical equation:

H₂ + Cl₂    →     2HCl

Number of moles of H₂:

Number of moles = mass / molar mass

Number of moles = 0.40 g/ 2 g/mol

Number of moles = 0.2 mol

Number of moles of Cl₂:

Number of moles = mass / molar mass

Number of moles = 12.35 g/ 71 g/mol

Number of moles = 0.17 mol

Now we will compare the moles of HCl with H₂ and Cl₂.

                     H₂             :            HCl

                      1               :               2

                   0.2              :           2×0.2 = 0.4

                     Cl₂             :             HCl

                      1               :              2

                    0.17           :            2 × 0.17 = 0.34

Chlorine is limiting reactant.

Mass of HCl produced:

Mass = number of moles × molar mass

Mass = 0.34 mol × 36.5 g/mol

Mass = 12.41 g

Leftover mass of hydrogen:

                          Cl₂               :               H₂

                            1                :                 1

                           0.17            :             0.17

Number of moles of H₂ react with Cl₂  are 0.17.

Moles remain unreacted = 0.2 - 0.17 = 0.03 mol

Mass left over:

Mass = number of moles × molar mass

Mass = 0.03 mol × 2 g/mol

Mass = 0.06 g

The sum of the mass of HCl produced plus the mass of left over reactants is:

Mass of hydrogen = 0.06 g

Mass of HCl  = 12.41 g

Given:

Mass of H₂ = 0.40 g

Mass of Cl₂ = 12.35 g

Mass of left over reactant = ?

Mass of HCl produced = ?

Number of moles of H₂:

Number of moles = mass / molar mass

Number of moles = 0.40 g/ 2 g/mol

Number of moles = 0.2 mol

Number of moles of Cl₂:

Number of moles = mass / molar mass

Number of moles = 12.35 g/ 71 g/mol

Number of moles = 0.17 mol

The moles of HCl with H₂ and Cl₂.                

  H₂             :            HCl              

     1              :               2          

     0.2          :           2×0.2 = 0.4                

    Cl₂             :             HCl            

        1             :              2          

       0.17         :          2 × 0.17 = 0.34

The chlorine is limiting reactant.

Mass of HCl produced:

Mass = number of moles × molar mass

Mass = 0.34 mol × 36.5 g/mol

Mass = 12.41 g

Leftover mass of hydrogen:                

         Cl₂               :               H₂            

              1             :                 1          

               0.17       :             0.17

Number of moles of H₂ react with Cl₂  are 0.17.

Moles remain unreacted = 0.2 - 0.17 = 0.03 mol

Mass left over:

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Answer:

0.00000000000000084

Explanation:

Answer:

90.26%

Explanation:

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

Theoretical yield of AlCl₃ = 1551 g

Actual yield of AlCl₃ = 1400 g

Percentage yield =?

The percentage yield of the reaction can be obtained as follow:

Percentage yield = Actual yield / Theoretical yield × 100

Percentage yield = 1400 / 1551 × 100

Percentage yield = 140000 / 1551

Percentage yield = 90.26%

Thus, the percentage yield of the reaction is 90.26%

Answer:

-533.68J

Explanation:

Using the formula as follows:

Q = m × c × ∆T

Where;

Q = amount of heat required (Joules)

m = mass of substance (g)

c = specific heat of substance (J/g°C)

∆T = change in temperature (°C)

According to the information provided in this question;

Q = ?

m = 28.3 g

c of iron = 0.449 J/g°C

∆T = 24°C - 66°C = -42°C

Using the formula, Q = m × c × ∆T

Q = 28.3 × 0.449 × (-42)

Q = -533.68

Q = -533.68J

This means that 533.68J is lost to the environment when iron of 28.3g cools from 66°C to 24°C.

The solubility constant (Ksp) of lead (II) chloride if it has a molar concentration of 1.6 × 10-²M is 1.64 × 10-⁵.

Solubility is the amount of a substance that will dissolve in a given amount of a solvent, to give a saturated solution, under specified conditions.

PbCl₂(s) ⇌ Pb²⁺(aq) + 2Cl¯(aq)

The Ksp expression of lead chloride is as follows:

Ksp = [Pb²+] [Cl¯]²

There is a 1:1 molar ratio between PbCl₂ and Pb²⁺ but a 1:2 molar ratio between PbCl₂ and Cl.

Ksp = {1.6 × 10-²} {3.2 × 10-²}²

Ksp = 1.64 × 10-⁵

Therefore, 1.64 × 10-⁵ is the solubility constant of the lead (II) chloride.

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The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer:

I am pretty sure it is C.

Explanation:

Because the wave frequency's tell us the number of waves there are on that diagram.

Answer:

C. the number of vibrations per second an object is making

Explanation:

Hope this helps. Sorry if it doesn't. T^T

Answer:

Aqueous solutions of acids are electrolytes, meaning that they conduct electrical current. Some acids are strong electrolytes because they ionize completely in water, yielding a great many ions. Other acids are weak electrolytes that exist primarily in a non-ionized form when dissolved in water.

Acids have a sour taste. Lemons, vinegar, and sour candies all contain acids.

Acids change the color of certain acid-base indicates. Two common indicators are litmus and phenolphthalein. Blue litmus turns red in the presence of an acid, while phenolphthalein turns colorless.

Explanation:

Hope this helps

Table salt does not melt on the stove, it dissolves in water and does not conduct electricity.

There are several substances listed in the table Epsom salt is another one of these substances. It does not melt on a stove, it dissolves in water and also conducts electricity.

Finally, potassium chloride does not melt on the stove, it dissolves in water and it does conduct electricity. These are the experiences one can have with these common substances.

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On the basis of the area and petrified fossils, the following statements are true:

Thus, the correct options are A and D.

Petrified fossils may be defined as those which completely replace the organic form of fossils with mineral forms like stone.

The area was once a forest indicating that there must be a lot of death of organisms that are buried deep into the soil for millions of years.

This area also consists of a huge amount of water for the delocalization of dead organic matter to flow throughout the given area where the organic form is converted into mineral form.

Therefore, the correct options for this question are A and D.

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The heat of fusion of water is 79.9 cal/g. If a 7.2 g piece of ice melts in 105 g of water at 34.3 deg C in an insulated bottle, 35071.6 °C is the  final temperature of the water.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points or thermometric substances.

The most popular scales were the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the scale of Fahrenheit (°F), or the Kelvin scale (K), with the latter being mostly used for scientific purposes.

Δ T = T(initial) - T(final)

T(final)= m × c × q - T(initial)

T(final)= 79.9 x 4.184 x 105 - 30.0

T(final)= 35071.6 °C

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Answer:

71.3 g

Explanation:

molar mass of C₇H₆O₃ = 138.13 g

molar mass of \(C_{9}H_{8}O_{4}\) = 180.17 g

find the moles of reactant: C₇H₆O₃

C₇H₆O₃ that reacted = mass/molar mass = 57.6 g C₇H₆O₃ / 138.13 g C₇H₆O₃

= 0.417 mol \(C_{7}H_{6}O_{3}\)

From the reaction equation, 1 mole of C₇H₆O₃ yields one mole of aspirin

find theoretical yield of aspirin:

0.417 mol C7H6O3 x 180.17 g C9H8O4 / 1 mol C9H8O4\(\frac{0.417 mol C_{7}H_{6}O_{3}}{} x \frac{180.17 g C_{9}H_{8}O_{4}}{1 mol C_{9}H_{8}O_{4}}\)

= 75.1 g C9H8O4

Actual yield= % yield × theoretical yield/100

Actual yield = 95.0 × 75.1/100

Actual yield = 71.3 g

Taking into account the reaction stoichiometry and actual yield, the mass of C₉H₈O₄ produced from 57.6 g of C₇H₆O₃ assuming 95.0% yield is 57.0285 grams.

The balanced reaction is:

22 C₇H₆O₃ (s) + 32 C₄H₆O₃ (s) → 24 C₉H₈O₄ (s) + 33 HC₂H₃O₂ (aq)

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 mass molar of each compound is:

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

Then you can apply the following rule of three: if by stoichiometry 3036 grams of C₇H₆O₃ produce 3264 grams of C₉H₈O₄, 57.6 grams of C₇H₆O₃ will produce how many mass of C₉H₈O₄?

\(mass of C_{9} H_{8} O_{4} =\frac{57.6 grams of C_{7} H_{6} O_{3} x3264 gramsof C_{9} H_{8} O_{4} }{3036 grams of C_{7} H_{6} O_{3}}\)

mass of C₉H₈O₄= 60.03 grams

On the other side, actual yield is the amount of product actually obtained from a reaction. Assuming 95.0% yield  and considering the previously calculated mass the maximum amount of product that can be produced in the reaction, you can apply the following rule of three:  If 100% equals 60.03 grams of the compound produced, 95% equals how much mass of the compound?

\(mass of C_{9} H_{8} O_{4} =\frac{95 percentx60.03gramsof C_{9} H_{8} O_{4} }{100 percent}\)

mass of C₉H₈O₄= 57.0285 grams

Finally, the mass of C₉H₈O₄ produced from 57.6 g of C₇H₆O₃ assuming 95.0% yield is 57.0285 grams.

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1) A precipitate called \(Fe(OH)_{2}\)

2) A precipitate is formed called \(Mg(CH_{3} COO)_{2}\)

The term precipitate is used to describe the product that is formed when there is a reaction between two aqueous phase reactants that leads to the formation of a solid product from the reaction as we can see from the image that is attached.

we now have to look at the reactions as we can see them in the mage that is attached. We must note that we can only say that a precipitate has been formed if the product is solid after we have mixed the aqueous phase reactants.

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Answer:

Explanation:

#stay home

#stay safe

#stay healthy

Answer:

D all of these

Explanation:

All of these are true about mixtures and compounds.

Mixtures and compounds are both made of two or more different substances.

The key difference between mixtures and compounds is that a compound is a new substance that

forms when other substances chemically combine. The new substance that is formed has

different properties from the original substances.

A mixture is simply a physical combination of two or more substances. Some of the individual

properties of the original substances are retained by the mixture.

Answer:

A) I think I might be wrong :^

The balanced chemical equation for the reaction between aluminum and chlorine to form aluminum chloride is:2Al + 3Cl₂ → 2AlCl₃.2.1.the amount of AlCl₃ produced is  1.50 moles   if we made 10.8 moles of AlCl₃, we would need 3.00 moles of Aluminum.

To solve the given problems, we will use stoichiometry, which is the study of the quantitative relationships between reactants and products in a chemical reaction.

If we have 1.50 moles of Aluminum and excess chlorine, we can calculate the amount of AlCl₃ produced using stoichiometry as follows:

From the balanced equation, we can see that 2 moles of Al reacts with 3 moles of Cl₂ to produce 2 moles of AlCl₃.

Therefore, 1 mole of Al reacts with 3/2 = 1.5 moles of Cl₂ to produce 1 mole of AlCl₃.

The given amount of Aluminum is 1.50 moles, which means it will react with 1.5 × (1/2) = 0.75 moles of Cl₂.

Since there is excess chlorine, all of it will be consumed in the reaction, and we can assume that the amount of AlCl₃ produced will be proportional to the amount of Aluminum consumed.

the amount of AlCl₃ produced is also 1.50 moles × (2 moles AlCl₃ / 2 moles Al) = 1.50 moles.

The molar mass of AlCl₃ is 133.34 g/mol, so the mass of AlCl₃ produced is:

1.50 moles × 133.34 g/mol = 200.01 g

Therefore, if we have 1.50 moles of Aluminum and excess chlorine, we can produce 200.01 g of AlCl₃.

If we made 10.8 moles of AlCl₃, we can calculate the amount of Aluminum required using stoichiometry as follows:

From the balanced equation, we can see that 2 moles of Al reacts with 2/3 × 10.8 = 7.2 moles of AlCl₃ to produce 2 moles of AlCl₃.

Therefore, 1 mole of Al reacts with 7.2/2 = 3.6 moles of AlCl₃ to produce 1 mole of AlCl₃.

To produce 10.8 moles of AlCl₃, we need 10.8 moles × (1 mole Al / 3.6 moles AlCl₃) = 3.00 moles of Aluminum

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The number of bonding pairs and the number of lone pairs around the right hydrogen atom in this molecule is 1 in no. (bonding pairs) and 0 in no. (lone pairs).

The right hydrogen atom in this molecule is bonded to the carbon atom through a single bond. The carbon atom in turn has a total of four bonds: two with the hydrogen atoms and two with the other carbon atom in the molecule. In the Lewis structure, a single bond is represented by a line connecting two atoms. A pair of electrons shared between two atoms is called a bond pair. Thus, the right hydrogen atom has 1 bonding pair and 0 lone pairs. Lone pairs refer to electrons that are not involved in bonding but are present around an atom. In this molecule, the right hydrogen atom only has one bonding pair, and no electrons are present as lone pairs.

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Answer:

the heat given off is 75 J.

Explanation:

Given;

latent heat of fusion of lead, L= 25 J/g

mass of liquid lead, m = 3.0g

The heat given off is calculated as;

H = Lm

Where;

H is the quantity of heat given off

H = 25 x 3

H = 75 J.

Therefore, the heat given off is 75 J.

The percent by mass of the lithium in the compound is 18.78%. Option C

We know that the percentage has to do with the amount of the element that can be found in the compound. We can be able to obtain this when we  find the molar mass of the compound and then obtain the mass of the element in the compound.

Hence;

Molar mass of the compound = [2(7) + 12 + 3(16)]

= 14 + 12 + 48

= 74 g/mol

The we have the mass of the lithium in the compound as 14

Thus we then have;

Percent of lithium = 14/74 * 100/1

= 18.78%

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A methane molecule (CH4) is considered symmetrical because it possesses a symmetric structure and exhibits symmetry operations.

Symmetry refers to a balanced arrangement of elements that can be divided into equal parts by a plane, axis, or center. In the case of methane, it exhibits several symmetrical characteristics.

Firstly, methane has a tetrahedral molecular geometry, with the carbon atom at the center and four hydrogen atoms positioned around it. This geometry ensures that the molecule is symmetrical in terms of its spatial arrangement.

Each hydrogen atom is located at one of the vertices of the tetrahedron, forming equal angles and distances with respect to the central carbon atom. This symmetry is maintained regardless of the orientation of the molecule.

Additionally, methane possesses rotational symmetry. It can be rotated around any of the carbon-hydrogen bonds, and the molecule will retain its overall appearance.

The symmetry of methane arises from its molecular structure and the equal distribution of electron density around the central carbon atom. The four hydrogen atoms are bonded to the carbon through sigma bonds, which have a cylindrical symmetry. This balanced arrangement of the atoms contributes to the overall symmetry of the molecule.

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When 325 grams of CHCl3 is produced, approximately 297.54 grams of HCl are also produced.

To determine the amount of HCl produced when 325 grams of CHCl3 (chloroform) is produced, we need to use the balanced chemical equation for the reaction:

CH4 + 3Cl2 -> CHCl3 + 3HCl

From the balanced equation, we can see that the stoichiometric ratio between CHCl3 and HCl is 1:3. This means that for every 1 mole of CHCl3, 3 moles of HCl are produced.

To calculate the number of moles of CHCl3, we need to divide the given mass (325 grams) by its molar mass:

Molar mass of CHCl3 = 12.01 g/mol (C) + 1.01 g/mol (H) + 3 x 35.45 g/mol (Cl) = 119.38 g/mol

Moles of CHCl3 = 325 g / 119.38 g/mol = 2.72 mol

Since the stoichiometric ratio between CHCl3 and HCl is 1:3, the number of moles of HCl produced is three times that of CHCl3:

Moles of HCl = 2.72 mol x 3 = 8.16 mol

To calculate the mass of HCl, we multiply the number of moles by its molar mass:

Molar mass of HCl = 1.01 g/mol (H) + 35.45 g/mol (Cl) = 36.46 g/mol

Mass of HCl = 8.16 mol x 36.46 g/mol = 297.54 g

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