Can anyone help with 5 through 8? Please :(

Answer:

16.933g approximately 17.0 grams

Explanation:

From the simple promotions and given the same compound ascorbic acid (vitamin C)

In the laboratory synthesised ascorbic acid

Mass of carbon = 30.0g

Mas of Oxygen = 40.0g

That is the mass of Oxygen per unit mass of Carbon

Per gram of Carbon we have

(30.0g Carbon)÷30 combines with (40.0g of Oxygen)÷30

That is 4/3g of Oxygen per gram of Carbon

Hence the mass of Oxygen compound that combines with 12.7g of Carbonin natural occurring ascorbic acid (vitamin C) is = 4/3×12.7 = 16.933g approximately 17.0g

The amount of oxygen in the second sample, calculated using the concept of stoichiometry and the ratio of carbon to oxygen in the first sample, is approximately 16.9 grams.

This question involves the concept of stoichiometry in Chemistry. Given the masses of carbon and oxygen in the laboratory synthetized sample, we can determine the ratio of carbon to oxygen. This is 30.0g Carbon / 40.0g Oxygen = 0.75. We assume this ratio is the same in any sample of ascorbic acid regardless of its source, because the makeup of a pure substance is always the same. Therefore, to find the amount of oxygen in the lemon-sourced sample, we can use this ratio: 12.7g Carbon / x g Oxygen = 0.75. Solving for x gives us the mass of oxygen, which is approximately 16.9g.

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Answer:

the required concentration is 1.52 M

2 HCl + Na2CO3 -----> CO2 + H2O + NaCl

2 moles HCl reacts to form 1 mole of CO2 .

no. of moles of CO2 = 20.1/ 44.1 = 0.455

no. of moles of HCl = 0.455* 2 = 0.911 mole (molar ratio =2 from equation)

con. of HCl =no. of moles/volume in liter

=0.911/ 0.597 = 1.52 M

Final answer:

To find the concentration of an HCl solution from the mass of CO₂ produced in a reaction, we first calculate the moles of CO₂ and then use the molar ratio between HCl and CO₂ to find the moles of HCl. Finally, we find the concentration by dividing the moles of HCl by the volume of the solution in liters, resulting in a concentration of 0.7102 M for the HCl solution.

Explanation:

To determine the concentration of the HCl solution, we must first calculate the number of moles of CO₂ produced from the given mass. CO₂ has a molar mass of 44.01 g/mol, so the number of moles of CO₂ can be calculated as follows:

Number of moles of CO₂ = 17.1 g CO2 ÷ 44.01 g/mol = 0.3885 mol CO₂

According to the balanced chemical equation for the reaction between HCl and Na₂CO₃:

HCl(aq) + Na₂CO₃(aq) → H₂O(l) + CO₂(g) + 2NaCl(aq)

We can see there is a 1:1 molar ratio between HCl and CO₂. This means the number of moles of HCl is also 0.3885 mol. Now we can calculate the concentration of HCl in the 547 mL solution by using the number of moles and the volume in liters (0.547 L):

Concentration of HCl = Moles of HCl ÷ Volume of solution in liters

Concentration of HCl = 0.3885 mol ÷ 0.547 L = 0.7102 M

Therefore, the concentration of the HCl solution is 0.7102 M.

The ΔG°rxn at 25.0 °C for the given reaction is -4.184 KJ/mol, which means the reaction is spontaneous under standard conditions. When actual concentrations are provided, the ΔGrxn at 25.0 °C is -2.81 kJ/mol, indicating that the reaction remains spontaneous.

To calculate the ΔG°rxn at 25.0 °C, we'll be utilizing the formula ΔG° = -RT ln K, where R is the gas constant (8.314 J/mol K), T is the temperature in Kelvin (25.0 °C = 298.15 K), and K is the equilibrium constant Kf (2.5 × 10³ M^-2). The R needs to be converted to kJ from J by dividing it by 1000. Following these conversions, we can substitute these values:

ΔG° = - (8.314 x 10^-3 kJ/mol K) x (298.15 K) x ln (2.5 × 10³ M^-2) = -4.184 KJ/mol

The spontaneity of the reaction is determined by the sign of ΔG. In this case, since ΔG is negative, it indicates that the reaction is indeed spontaneous under standard conditions.

For evaluating ΔGrxn at 25.0 °C when [Ag^+]=0.00850 M, [NH₃]=0.156 M, and [[Ag(NH₃)2]^+]=0.00632 M, we must resort to the equation ΔG = ΔG° + RT ln Q, where Q is the reaction quotient. We substitute the actual concentrations into the equilibrium expression to get Q = {[Ag(NH₃)2]^+} / ([Ag^+] x [NH₃]^2) = 0.00632 / (0.00850 x (0.156)^2) = 2.666. Thus, the ΔGrxn can be calculated as ΔG = -4.184 kJ/mol + 8.314 x 10^-3 kJ/mol K x 298.15K x ln(2.666) = -2.81 kJ/mol.

As ΔGrxn remains negative even with these conditions, the reaction still remains spontaneous.

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Explanation:

The electronegativity difference in C-C and C-H atoms is quite low. This means smaller the electron cloud. This further means larger bond length that is electron's are further from the nucleus.  hence,  higher potential energy of C-C and C-H bonds.

On the contrary, C-O and H-O have large difference in electronegativity( O is high electronegative element) . This means smaller bond length. Electron's near the nucleus. Thus, lower potential energy of bonds.

Answer:

B. frost wedging Hope i helped!

Explanation:

Answer:

B

Explanation:

Answer:

The final concentration of NaI is 0.4M

Explanation:

Step 1: Data given

Initial volume of a 0.2 M NaI solution

To form a 1.0 L solution

The molar mass of NaI is 150 g/mol

Step 2: Calculate the moles of NaI

Moles NaI = 0.2M * 2.0 L = 0.4 moles

Step 3: Calculate the final concentration

Concentration = moles / volume

Concentration = 0.4 moles / 1.0L

Concentration = 0.4M

The final concentration of NaI is 0.4M

Answer: A. It has 20 protons, 20 neutrons and 20 electrons

Explanation: The atomic number of an atom is equal to the number of protons inside the nucleus. In a neutral atom the number of electrons and protons are equal.

The number of neutrons can be determined by this formula

Atomic Mass - Atomic Number = n

40 - 20 = 20 neutrons

Protons = 20

Electrons = 20

Neutrons = 20

Answer:

Empirical formula will be (NH₄)₃PO₄, which matches the molecular formula

Explanation:

This is the reaction:

NH₃ + H₃PO₄ → 28.2% N, 20.8% P, 8.1% H, 42.9% O

In 100 g of compound we have:

28.2 g N

20.8 g of P

8.1 g of H

42.9 g of O

Now we divide each  between the molar mass:

28.2 g / 14 g/mol = 2.01 mol

20.8 g / 30.97 g/mol = 0.671 mol

8.1 g / 1 g/mol = 8.1 mol

42.9 g / 16 g/mol =  2.68 mol

And we divide again between the lowest value of moles

2.01 mol / 0.671 mol → 3

0.671 mol / 0.671 mol → 1

8.1 mol / 0.671 mol → 12

2.68 mol / 0.671 mol → 4

Molecular formula will be: N₃PH₁₂O₄ → (NH₄)₃PO₄

Empirical formula will be (NH₄)₃PO₄, which matches the molecular formula

Answer:

correct answer is a) primary air pollutants

Explanation:

solution

primary air pollutants material are that material which release pose health risk in the unmodified form and they emitted directly from identifiable source not react so they are primary air pollutant

and some major material released directly into the atmosphere as unmodified are given below

they all are primary air pollutants

so correct answer is is a) primary air pollutants

Answer:

2.1 M is the molarity of the HCl solution.

Explanation:

[tex]HCl+NaOH\rightarrow H_2O+NaCl[/tex]

Molarity of HCl solution = [tex] M_1=?[/tex]

Volume of HCl solution = [tex]V_1=50.0mL[/tex]

Ionizable hydrogen ions in HCl = [tex]n_1=1[/tex]

Molarity of NaOH solution = [tex] M_2=1.05 M[/tex]

Volume of NaOH solution = [tex]V_2=100.0 mL[/tex]

Ionizable hydroxide ions in NaOH = [tex]n_2=1[/tex]

[tex]n_1M_1V_1=n_2M_2V_2[/tex] (neutralization )

[tex]M_1=\frac{M_2V_2}{V_1}=\frac{1.05M\times 100.0 mL}{50.0 mL}[/tex]

[tex]M_1=2.1 M[/tex]

2.1 M is the molarity of the HCl solution.

Final answer:

The molarity of the HCl solution is determined by calculating the heat absorbed during the reaction, converting this heat to moles of reacted NaOH, and assuming equimolar reaction with HCl. The final molarity of HCl is found to be 2.10 M.

Explanation:

To determine the molarity of the HCl solution, we first need to calculate the heat absorbed by the solution during the neutralization reaction using the specific heat capacity, mass, and change in temperature of the solution.

Calculate the Heat Absorbed by the Solution

Firstly, the total volume of the solution is the sum of the volumes of HCl and NaOH, which is 50.0 mL + 100.0 mL = 150.0 mL. The density of the solution is given as 1.02 g/mL, so the mass of the solution is 150.0 mL × 1.02 g/mL = 153.0 g.

The change in temperature (ΔT) is the final temperature minus the initial temperature, so ΔT = 30.2°C - 22.4°C = 7.8°C.

The heat absorbed (q) by the solution is calculated using the formula q = mass × specific heat × ΔT. Substituting the values, we get q = 153.0 g × 0.96 cal/g°C × 7.8°C = 1143.36 cal.

Convert Heat to Kcal and Calculate Moles of NaOH

Since q needs to be in kilocalories to use the heat of neutralization, we convert 1143.36 cal to kcal: 1143.36 cal × (1 kcal / 1000 cal) = 1.14336 kcal.

We know the heat of neutralization for HCl and NaOH is 13.6 kcal/mol. Therefore, the number of moles of NaOH reacted (which equals moles of HCl because they react 1:1) is:
moles of NaOH = 1.14336 kcal / 13.6 kcal/mol = 0.0841 mol.

Calculate Molarity of HCl

Since 100.0 mL of 1.05M NaOH contains 0.105 mol/L × 0.100 L = 0.105 mol NaOH, and we know all HCl has reacted, we can say that the moles of HCl must also be 0.105 mol.

The molarity (M) of HCl is the number of moles of HCl divided by the volume of HCl in liters. M = moles / liters = 0.105 mol / 0.050 L = 2.10 M HCl.

Answer:

NAD+, FAD.

Explanation:

The citric acid cycle is popularly known as the Kreb's cycle. The cycle involve the oxidation of acetyl-CoA to produce energy. The Kreb's cycle is a chemical process that produces produces two carbon dioxide molecules,NADH,FADH2 and one ATP.

When oxygen is depleted, the citric acid cycle stops, apart from oxygen NAD+ and FAD could be added to the system to restore citric acid cycle activity. NAD+ acts as an electron acceptor.

Citric acid cycle/Kreb's cycle is an aerobic process that occurs in the mitochondria and produces thirty-six(36) ATPs.

To restore citric acid cycle activity when oxygen is depleted is to add an electron acceptor.

In the absence of oxygen, the electron transport chain cannot function properly because oxygen acts as the final electron acceptor in the process of oxidative phosphorylation.

When oxygen is not available, electrons accumulate, and the energy-generating process of the mitochondria is inhibited. This results in the cessation of the citric acid cycle due to the lack of NAD+ and FAD, which are required as electron carriers in the cycle.

To restore the activity of the citric acid cycle under anaerobic conditions, one could add an alternative electron acceptor that can be reduced instead of oxygen.

Answer:

The assumptions  we make when we infer the mass of a galaxy cluster from observations of the spectra of its constituent galaxies is thermal hydrostatic equilibrium

Explanation:

In galaxy cluster observation, thermal X-ray emission from the hot intracluster gas measures directly the gas density and temperature distributions within the cluster. This hot gas is confined by and expected to trace the underlying three-dimensional gravitational potential. Under the assumption of thermal hydrostatic equilibrium, these gas properties may be used to infer the cluster total mass distribution.

Hence, the assumptions  we make when we infer the mass of a galaxy cluster from observations of the spectra of its constituent galaxies is thermal hydrostatic.

Answer:

2 or more

Explanation:

There are 2 or more valid electron dot formulas—having the same number of electron pairs for a molecule or ion—can be written when a resonance structure occur as we know that Sharing of electrons takes place so that atoms achieve noble gas configurations. So, How is it that an electron dot arrangement reflects a covalent bond? An electron dot arrangement represents a pair of dots with the mutual electrons of a covalent bond.  A great energy of dissociation from bonds leads to a solid covalent bond.

Answer: 2 or more

Explanation:

Answer: Option (A) is the correct answer.

Explanation:

It is known that the relation between force and electric field is as follows.

                           F = qE .......... (1)

where,      F = force

                q = charge

                E = electric field

Also, we know that,   F = ma ...... (2)

Hence, equating equation (1) and (2) as follows.

                   qE = ma

or,                q = [tex]\frac{ma}{E}[/tex]  

Therefore, putting the given values into the above formula as follows.

                     q = [tex]\frac{ma}{E}[/tex]  

                        = [tex]\frac{441 g \times 13.0 m/s^{2}}{5.0 N/C}[/tex]

                        = 1.1466 C        

                        = 1.15 C (approx)

Therefore, we can conclude that the charge carried by given charge is 1.15 C.

Answer:

4.00 moles

Explanation:

Avogadro´s number is 6.022 x 10²³ molecules, atoms, particles, etc.

Here we are talking of atoms of copper, so 1 mol of copper is equal to 6.022 x 10²³ atoms, and we only need to setup the proportion to find the number of mol in 2.41 x 10²⁴ atoms. ( Think of it like a dozen, avogadro´s is 6.022 x 10²³ )

( 1 mol copper/ 6.022 x 10²³ atoms of copper ) x  2.41 x 10²⁴ atoms

= 4.00 moles

Answer:

I and II

Ionization and. Dissociation

Explanation:

Dissociation,

Is to unbundle a compound into smaller, less complex constituents that are generally able to recombine under different conditions.

Ionization or ionisation,

Is the process in which an atom or a molecule accepts or loses electrons to become negatively or positively charged, it often is accompanied by with chemical changes.

Dispersion

The act of distributing things over a wide area.

The dissolving processes that change the identity of a substance in chemistry are ionization and dissociation.

The dissolving processes that change the identity of a substance are ionization and dissociation.

Ionization occurs when a substance forms ions in a solution. For example, when hydrochloric acid (HCl) dissolves in water, it ionizes into hydrogen ions (H+) and chloride ions (Cl-).

Dissociation happens when a compound breaks apart into its constituent ions in a solution. One example is table salt (NaCl) dissociating into sodium ions (Na+) and chloride ions (Cl-) when dissolved in water.

Dispersion is the process of solute particles spreading evenly throughout a solvent, without forming ions or breaking apart into ions. Dispersion does not change the identity of the substance.

Answer:

The color of solution at the end point will be blue.

Explanation:

EBT is used as an indicator for complexometric titrations and acts as a chelating agent. It has a blue color, in its free form, when the pH is adjusted to 10.

On the addition of CaCl₂, EBT binds with Ca(II) and gives a red color, due to its EBT-Ca (II) complex. So, the color at the start of the titration is red.

When EDTA is added, it starts to form EDTA-Ca(II) complex. Near the endpoint, it starts to replace EBT bound to Ca, because it has a higher formation constant (Kf) for its EDTA-Ca(II) complex than EBT-Ca(II) complex. The EDTA-Ca(II) has no color so the solution shows the colour of free EBT, which is blue. Hence the color at the endpoint will be blue.

Answer:

The anion value of 21mEq/L suggest the client will have metabolic acidosis

Explanation:

Anion gap is the interval or difference between measured cations (Sodium and Potassium) with the sum of measured anions (chloride and bicarbonate)

Using the above mentioned data

(166 + 5) - (115 + 35)  =  21mEq/L

Therefore the Anion gap = 21mEq/L

Answer:

c. strontium is chemically similar to calcium and is incorporated into bone.

Explanation:

Strontium is a chemical element in group two which bears a great similarity with calcium in terms of chemical reactivity, ion size, etc. Hence it can easily replace calcium in the bone, causing a great damage to the individual because of its radioactivity.

Answer: The acetaminophen

Explanation: Liquid-Liquid is a very important and commercial separation method used for the chemical separation and analyst of chemical mixtures. It is also known as PARTITIONING. In this technique the solute is transferred from one solvent to another of which both solvents are IMMISCIBLE OR PARTLY MISCIBLE. example in the mixture involving sodium bicarbonate,acetylsalicylic acid and acetaminophen and a binder after the binder is removed and you mix the two other components with the sodium bicarbonate the solution the acetylsalicylic acid dissolved but the acetaminophen did not meaning you could separate it from the other.

Answer:

5.04 kJ

Explanation:

We are given the enthalpy of fusion of methanol as 3.16 kJ per mol of methanol. Thus, what we need is to determine is the number of mol in 25.4 g of methanol and multiply by this enthalpy.

mol methanol = mass / MW CH₃OH = 25.6 mol / 16.04 g/mol = 1.60 mol

ΔH = 1.60 mol x 3.16 kJ/mol = 5.04 kJ

Answer:

Option (A)

Explanation:

Thus, all these three processes are mainly implemented in order to reduce soil erosion, which usually takes place due to agents like wind and water.

Hence, the correct answer is option (A).

Answer:

a

Explanation:

The question is incomplete, the complete question is

The following equation is the balanced combustion reaction for C6H6

[tex]2C_6H_6(l)+15O_2(g) \rightarrow 12CO_2(g)+6H_2O(l)+6542 kJ[/tex]

If 7.400 g of [tex]C_6H_6[/tex] is burned and the heat produced from the burning is added to 5691 g of water at 21°C. What is the final temperature of the water?

Answer:

34.45°C is the final temperature of the water.

Explanation:

Moles of benzene = [tex]\frac{7.400 g}{78 g/mol}=0.09487 mol[/tex]

According to reaction, 2 moles of benzene on combustion gives 6542 kJ of heat. Then 0.09487 moles of benzene will give:

[tex]\frac{1}{2}\times 6542 kJ\times 0.09487 mol=310.325 kJ[/tex]

Heat added to water = Q = 310.325 kJ = 310,325 J

(1 kJ = 1000 J)

Specific heat of water = C = [tex]4.18 J/g^oC[/tex]

Mass of the water = m = 5691 g

Initial temperature of the water =[tex]T_1[/tex] = 21°C

Final temperature of the water =[tex]T_2[/tex] =?

Change in temperature of the substance =ΔT =[tex]T_2-T_1[/tex]

[tex]Q=mc\times \Delta (T_2-T_1)[/tex]

[tex]310,325 J=5691 g\times 4.18 J/g^oC\times (T_2-21^oC)[/tex]

[tex]T_2=34.45^oC[/tex]

34.45°C is the final temperature of the water.

Answer:

The final temperature of the water is 34.0 °C

Explanation:

Step 1: Data given

Mass of C6H6 burned = 7.400 grams

Mass of water = 5691 grams

Temperature of water = 21 °C

Specific heat of water = 4.184 K/g°C

2C6H6+15O2→12CO2+6H20+6542KJ

Heat released with combustion of C6H6 = 6542KJ

Step 2: Calculate moles of C6H6

Moles C6H6 = mass C6H6 / molar mass C6H6

Moles C6H6 = 7.400 grams / 78.11 g/mol

Moles C6H6 = 0.09474

Step 3: Calculate heat transfered

Q = 0.09474 moles * 6542 kJ/2 mol = 309.89 kJ

Step 3: Calculate finam temperature

Q = m * c * ΔT

⇒ with Q = the heat transfered =309.9 kJ = 309890 J

⇒ with m = the mass of water =  5691 grams

⇒ with c = the specific heat of water = 4.184 J/g°C

⇒ with ΔT = The change in temperature

ΔT = Q /(m*c)

ΔT = 309890 / ( 5691 * 4.184)

ΔT =13.0 °C

Step 4: Calculate the final temperature

T2 = T1 + ΔT

T2 = 13.0 + 21.0°C

T2 = 34.0 °C

The final temperature of the water is 34.0 °C

Answer:

Force of Tension = 1832.8  N

Explanation:

Any mass of object supported or pulled by a rope or cable  is subject to a force of tension. Since the mass is raised by a cable, tension is involved.

Mathematically,

Tension = mass × gravity(9.8 m/s²)

Tension can be represented as

T = (m × g) + (m × a)

Where g is the acceleration due to gravity of the object the cable is supporting and a is the acceleration on the object the cable is supporting. And m is the mass of the object.

mass = 158 kg

a = 1.8 m/s²

g = 9.8 m/s²

T = mg + ma

T = m(g + a)

T = 158(9.8 + 1.8)

T = 158 × 11.6

T = 1832.8  N

Obligate anaerobes survive without oxygen by using anaerobic respiration or fermentation as their energy-producing processes. They lack normal cellular defenses against oxidative stress, which makes oxygen lethal to them. For example, Clostridium perfringens bacteria are obligate anaerobes that cannot survive in the presence of oxygen and use molecules other than oxygen as terminal electron acceptors.

Obligate anaerobes are organisms that cannot live in an environment where there is oxygen. They survive without oxygen by using anaerobic respiration or fermentation as their energy-producing processes. These organisms lack normal cellular defenses against oxidative stress, which makes oxygen lethal to them. For example, Clostridium perfringens bacteria are obligate anaerobes that cannot survive in the presence of oxygen and use molecules other than oxygen as terminal electron acceptors.

Answer: Photons

Explanation: These are packet of light. These subatomic particles have no electrical charge and rest mass. Photons are also considered as field particles in which they are to be carriers of electromagnetic fields.

Answer:

Empathetic listening

Answer:

The answer to your question is " 3 "

Explanation:

Equation = ?

Phosphoric acid = H₃PO₄

Calcium hydroxide = Ca(OH)₂

This is an acid base reaction because there is an exchange of hydrogens.

Reaction

                   H₃PO₄   +   Ca(OH)₂   ⇒   Ca₃(PO₄)₂  +   H₂O

Balance

                             Reactants      Elements      Products

                                  1                       P                    2

                                  1                      Ca                   3

                                  5                     H                     2

                                  6                     O                    9

The reaction is unbalanced

                   2H₃PO₄   +   3Ca(OH)₂   ⇒   Ca₃(PO₄)₂  +   6H₂O

Balance

                             Reactants      Elements      Products

                                  2                      P                    2

                                  3                      Ca                  3

                                 12                     H                    6

                                 14                     O                    14

Now, the reaction is balanced, the coefficient of Calcium hydroxide is 3

Answer: The mass of nitrogen gas that must be reacted is 1.4 grams

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]      .....(1)

Given mass of ammonia = 1.7 g

Molar mass of ammonia = 17 g/mol

Putting values in equation 1, we get:

[tex]\text{Moles of ammonia}=\frac{1.7g}{17g/mol}=0.1mol[/tex]

The chemical equation for the production of ammonia follows:

[tex]N_2+3H_2\rightarrow 2NH_3[/tex]

By Stoichiometry of the reaction:

2 moles of ammonia is produced by 1 mole of nitrogen gas

So, 0.1 moles of ammonia will be produced from [tex]\frac{1}{2}\times 0.1=0.05mol[/tex] of nitrogen gas

Now, calculating the mass of nitrogen gas from equation 1, we get:

Molar mass of nitrogen gas = 28 g/mol

Moles of nitrogen gas = 0.05 moles

Putting values in equation 1, we get:

[tex]0.05mol=\frac{\text{Mass of nitrogen gas}}{28g/mol}\\\\\text{Mass of nitrogen gas}=(0.05mol\times 28g/mol)=1.4g[/tex]

Hence, the mass of nitrogen gas that must be reacted is 1.4 grams

Answer:

B. An ionized atom has a number of protons that is unequal to the number of electrons.

Explanation:

For a neutral atom , the number of proton and electron is equal. An ionized atom has either loss or gain electron, thereby making the number of proton and electron unequal. The answer B is true because an ionized atom has either loss or gain electron to make the number of electron and proton unequal.

Option A is incorrect because a cations holds a positive charge when it loss one or more electron not when it gains one or more electron(s). Anions possess negative charge for gaining electron(s).

Option C is not true because ions can also carry negative charges and they are called anions.

Option D is false because losing one or more electron will turn an atom to a cations.