Calculate the number ofntotal of atoms in 25.3g sample of propane C3H8

Answer:

B) A drawn bow is released, causing an arrow to fly across the field

Explanation:

Potential energy can be thought of as "potential" to do something. For eg, putting a ball on top of hill causes the ball to have the potential to roll down the hill if released. Here the ball converts the potential energy into kinetic energy (energy of motion) to roll down.

Similarly, the bow has been stretched (potential to fly if released), and when its released, it converts the potential energy into kinetic energy.

Answer and Explanation:

Magnesium  = Mg (metal) ⇒ oxidation number = +2 (it loses 2 electrons)

Oxygen = O (non-metal) ⇒ oxidation number in oxides = -2 (it gains 2 electrons)

a) We first write the chemical elements with their oxidation numbers in superscripts:

Mg⁺² O⁻²

Then, the oxidation numbers are written crossed as subscripts:

Mg₂O₂

Finally, we divide by a common denominator (2):

MgO

b) Between a metal (Mg) and a non-metal (O), the formed bond is an ionic bond. The metallic element (Mg) loses 2 electrons that are accepted by the non-metallic element (O).

c) Mg : loses 2 electrons ⇒ +2

   O: gains 2 electrons ⇒ -2

The total electrical charge is: +2 + (-2) = 0

Answer:

a. Neutral

b. Basic

Explanation:

To determine which of the salts are acidic, neutral or basci we should dissociate them and determine if the ions, can make hydrolysis to water.

KCl → K⁺  +  Cl⁻

We need to know, where do the ions come from. In this case, K⁺ comes from the KOH which is a strong base and Cl⁻ comes from the HCl, a strong acid. In conclussion, both are the conjugate weak acid and base, respectively. They do not make hydrolysis, so this salt is neutral. No protons or hydroxides are given.

NaClO → Na⁺  + ClO⁻

The Na⁺ comes from the NaOH, it is the conjugate weak acid from a strong base, while the ClO⁻ comes from the HClO, a weak acid. This means that the ClO⁻ can react to water, to make hydrolysis. The equilibrium will be:

ClO⁻  +  H₂O  ⇄  HClO  +  OH⁻

We are giving hydroxides to medium, so the salt is basic.

Answer:

1. C maybe

2. C

3. B

4. A

5. A

6. B

7. C

8. A

9. C

10. A

Answer:

\(X=75\%\)

Explanation:

From the question we are told that:

Concentration \(C_1=17.50ppb\)

Volume \(v=9mL\)

Spike Volume \(V_s=1.00mL\)

spike Conc \(C_2=2.29 ppb\)

Analysis Conc \(C_s=15.93 ppb\)

Generally the equation for  percent recovery is mathematically given by

 \(X=\frac{C_s'-C_1'}{C_2'}\)

Where

Concentration of spiked sample C_s'

 \(C_s'=C_s*(v+v_s)\)

 \(C_s'=15.92*(9+1)\)

 \(C_2=159.2\)

Concentration of unspiked sample C_1'

 \(C_1'=17.50*9mL\)

 \(C_1'=157.5\)

Concentration of spike sample C_2'

 \(C_2=2.29*1\)

 \(C_2=2.29\)

Therefore

 \(X=\frac{159.2-157.5}{2.29}\)

 \(X=75\%\)

Answer:

To determine the enthalpy and entropy of dissolving a compound, you need to measure the Ksp at multiple temperatures. Then, plot ln(Ksp) vs. 1/T. The slope of the plotted line relates to the enthalpy (ΔH) of dissolving and the intercept of the plotted line relates to the entropy (ΔS) of dissolving.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us use the thermodynamic definition of the Gibbs free energy and its relationship with Ksp as follows:

\(\Delta G=-RTln(Ksp)\\\\\Delta G=\Delta H-T\Delta S\)

Thus, by combining them, we obtain:

\(-RTln(Ksp)=\Delta H-T\Delta S\\\\ln(Ksp)=-\frac{\Delta H}{RT} +\frac{T\Delta S}{RT} \\\\ln(Ksp)=-\frac{\Delta H}{RT} +\frac{\Delta S}{R}\)

Which is related to the general line equation:

\(y=mx+b\)

Whereas:

\(y=ln(Ksp)\\\\m=-\frac{\Delta H}{R} \\\\x=\frac{1}{T} \\\\b=\frac{\Delta S}{R}\)

It means that we answer to the blanks as follows:

To determine the enthalpy and entropy of dissolving a compound, you need to measure the Ksp at multiple temperatures. Then, plot ln(Ksp) vs. 1/T. The slope of the plotted line relates to the enthalpy (ΔH) of dissolving and the intercept of the plotted line relates to the entropy (ΔS) of dissolving.

Regards!

Answer:Mass of CO2 = 0.60g

Explanation:

Given the chemical rection

Li2CO3(s) + 2HCl(aq) --> 2LiCl(aq) + H2O(l) + CO2(g

No of moles = mass / molar mass

molar mass Li2CO3 = Molecular mass  calculation: 6.941 x 2 + 12.0107 + 15.9994 x 3 =  

= 73.8909 g/mol

therefore Number of moles Li2CO3 = 1.0g / 73.89 g/mol

= 0.0135 moles Li2CO3

From our given Balanced equation,  shows that  

Li2CO3(s) + 2HCl(aq) --> 2LiCl(aq) + H2O(l) + CO2(g

1 mole Li2CO3 produces 1 mole CO2

therefore 0.0135 mol Li2CO3 will produce  0.0135 moles of CO2

Also

No of moles = mass / molar mass

Mass = No of moles x molar mass

molar mass of CO2=12.0107 + 15.9994 x 2=44.0095 g/mol

Mass of CO2= 0.0135 X 44.0095 g/mol =0.594≈0.60g

Cu + O2 --->  CuO2 -The first reaction is a combustion reaction

2 HCl + Mg → H2 + MgCl2- The second reaction is a Single replacement reaction

A combustion reaction is a type of chemical reaction that occurs between a fuel and an oxidizer in the presence of heat or light, resulting in the release of energy in the form of heat and light.

In other words, it is a reaction in which a substance reacts with oxygen to produce heat and light.

Combustion reactions are important in many aspects of daily life, including the burning of fossil fuels for energy production, the combustion of wood or other materials for heating or cooking, and the combustion of fuels in internal combustion engines.

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Answer:

It appears that the diagram you provided represents the chemical compound chlorine monofluoride (CI-F). The arrow below the compound may be intended to indicate the movement or flow of electrons in the compound.

Chlorine monofluoride is a highly reactive and toxic compound that is used as a powerful oxidizing agent. It is a compound of chlorine and fluorine, with the chemical formula ClF. It is a yellowish gas at room temperature and has a strong, pungent smell. Chlorine monofluoride is highly reactive and can ignite or explode upon contact with many materials, including water. It is used in a variety of industrial processes, such as the production of semiconductors and the purification of aluminum. However, it can also be harmful to human health if inhaled or ingested, and it should be handled with caution.

Explanation:

After the reaction is complete, no nitrogen and no hydrogen molecules remain, and 8.00 x 1014 molecules of NH3 are produced.

In the equation, nitrogen and hydrogen react at a high temperature, in the presence of a catalyst, to produce ammonia, according to the balanced chemical equation:N2(g)+3H2(g)⟶2NH3(g)The coefficients of each molecule suggest that one molecule of nitrogen reacts with three molecules of hydrogen to create two molecules of ammonia.

So, to determine how many molecules of ammonia are produced when four nitrogen and nine hydrogen molecules are present, we must first determine which of the two reactants is the limiting reactant.

To find the limiting reactant, the number of moles of each reactant present in the equation must be determined.

Calculations:
Nitrogen (N2) molecules = 4Hence, the number of moles of N2 = 4/6.02 x 1023 mol-1 = 6.64 x 10-24 mol
Hydrogen (H2) molecules = 9Hence, the number of moles of H2 = 9/6.02 x 1023 mol-1 = 1.50 x 10-23 mol

Now we have to calculate the number of moles of NH3 produced when the number of moles of nitrogen and hydrogen are known, i.e., mole ratio of N2 and H2 is 1:3.

The mole ratio of N2 to NH3 is 1:2; thus, for every 1 mole of N2 consumed, 2 moles of NH3 are produced.
The mole ratio of H2 to NH3 is 3:2; thus, for every 3 moles of H2 consumed, 2 moles of NH3 are produced.
From these mole ratios, it can be observed that the limiting reactant is nitrogen.

Calculation for NH3 production:
Nitrogen (N2) moles = 6.64 x 10-24 moles
The mole ratio of N2 to NH3 is 1:2; therefore, moles of NH3 produced is 2 × 6.64 × 10−24 = 1.33 × 10−23 moles.

Now, to determine how many molecules of NH3 are produced, we need to convert moles to molecules.
1 mole = 6.02 x 1023 molecules
Thus, 1.33 x 10-23 moles of NH3 = 8.00 x 1014 molecules of NH3 produced.

To find the amount of each reactant remaining after the reaction is complete, we must first determine how many moles of nitrogen are consumed, then how many moles of hydrogen are consumed, and then subtract these from the initial number of moles of each reactant.

The moles of nitrogen consumed = 4 moles × 1 mole/1 mole N2 × 2 mole NH3/1 mole N2 = 8 moles NH3
The moles of hydrogen consumed = 9 moles × 2 mole NH3/3 mole H2 × 2 mole NH3/1 mole N2 = 4 moles NH3
Thus, the moles of nitrogen remaining = 6.64 × 10−24 mol – 8 × 2/3 × 6.02 × 10^23 mol-1 = 5.06 × 10−24 mol
The moles of hydrogen remaining = 1.50 × 10−23 mol – 4 × 2/3 × 6.02 × 10^23 mol-1 = 8.77 × 10−24 mol

Finally, the number of molecules of each reactant remaining can be calculated as follows:
Number of N2 molecules remaining = 5.06 × 10−24 mol × 6.02 × 10^23 molecules/mol = 3.05 × 10−1 molecules ≈ 0 molecules
Number of H2 molecules remaining = 8.77 × 10−24 mol × 6.02 × 10^23 molecules/mol = 5.28 × 10−1 molecules ≈ 0 molecules.

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Answer:

A) Using the ideal gas law, we can calculate the number of moles of gas present:

```

PV = nRT

```

where:

* P = pressure (atm) = 1 atm

* V = volume (L) = 5.6 L

* n = number of moles of gas

* R = ideal gas constant = 0.08206 L atm / mol K

* T = temperature (K) = 273.15 K

Solving for n, we get:

```

n = (P * V) / RT

```

```

n = (1 atm * 5.6 L) / (0.08206 L atm / mol K * 273.15 K)

```

```

n = 0.25 mol

```

Therefore, there are 0.25 moles of gas present.

B) The molar mass of the gas can be calculated by dividing the mass of the gas (8.0 g) by the number of moles of gas (0.25 mol):

```

Molar mass = Mass / n

```

```

Molar mass = 8.0 g / 0.25 mol

```

```

Molar mass = 32 g/mol

```

The molar mass of the gas is 32 g/mol.

C) The common atmospheric gas with a molar mass of 32 g/mol is oxygen (O2). Therefore, the gas that was collected is oxygen.

Explanation:

Answer:

1) 0.261 M, 2) 0.662 M

Explanation:

1. We must calculate the molarity of 0.300 mol of Na₂S in 1.15 L of solution.

We know, Molarity = moles of solute/ volume of solution

= 0.300 mol/ 1.15 L
= 0.261 M

2. We must calculate the molarity of 34.7 g of MgS (56 u) in 935 mL of solution.

We know, Molarity = moles of solute/ volume of solution
Moles of MgS = 34.7/56 = 0.619
Volume of solution = 935 mL = 0.935 L

= 0.619 mol/ 0.935  L
= 0.662 M

Answer:

Weathering ➡️ Erosion ➡️ Deposition ➡️ Compaction ➡️ Cementation

Explanation:

The processes of sedimentary rock formation involves:

1. Weathering: The preexisting rocks are weathered through abrasion caused by sand-blasting and other weathering processes. This breaks down the rocks into smaller pieces.

2. Erosion: Erosion acts as an agent of transportation of the weathered products. The sediments that are weathered are transported through erosion. The flowing or flooding water carries them to where they are deposited.

3. Deposition: The weathered materials are eroded and deposited layer upon layer. This happens when there is nothing that can move them away again.

4. Compaction: The sedimentation continues as the deposited sediments become increasingly overburden. They begin to compact together and closing down pore spaces.

5. Cementation: The dissolved minerals begin to form mineral crusts through precipitation or crystallization. This gradually cements the sediments to form a rock.

Answer:

weathering, erosion, deposition, cementation, conpaction

Answer

The total energy is 4345.25 J

Explanation

From the question, we have the following given data

Since the specific heat of silver is 0.237 J/g°C. Therefore the formula to calculate the total energy transferred will be

Answer:

5l NO

2

at STP

No. of molecules=

22.4

5

mol=

22.4

5

×N

A

molecules

A) 5ℊ of H

2

(g)

No. of moles=

2

5

mol=

2

5

×N

A

molecules

B) 5l of CH

4

(g)

No. of moles of CH

4

=

22.4

5

mol=

22.4

5

N

A

molecules

C) 5 mol of O

2

=5N

A

O

2

molecules

D) 5×10

23

molecules of CO

2

(g)

Molecules of 5l NO

2

(g) at STP=5l of CH

4

(g) molecules at STP

Therefore, option B is correct.

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The given question is incomplete, hence, can not be answered. Still, adding some relevant information for your reference.

What are formal charges?

Formal charge (FC) is the charge associated with the atoms in a molecule, assuming that the electrons of all chemical bonds are shared equally between atoms, regardless of their relative electronegativities. In determining the optimal Lewis structure (or dominant resonance structure) of a molecule, structures are chosen such that the formal charge of each atom is as close to zero as possible.

In chemistry, the formal charge in the covalent view of a chemical bond is assigned to the atoms in a molecule assuming that all chemical bond electrons are equally shared between atoms, regardless of their relative electronegativities. is the virtual charge that Simply put, the formal charge is the difference between the number of valence electrons of an atom in the neutral free state and the number assigned to that atom in the Lewis structure. In determining the optimal Lewis structure (or dominant resonance structure) of a molecule, structures are chosen such that the formal charge of each atom is as close to zero as possible.

The given question is incomplete, hence, can not be answered. Still, adding some relevant information for your reference.

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Answer:

c.CH4 < NH3 because the NH bond is more polar than the CH bond.

Explanation:

Mg 2+(aq) + 2NO2 -(aq)  ⇒ Mg(NO2)2 (aq)

What is enthalpy?

In a thermodynamic system, energy is measured by enthalpy. Enthalpy is a measure of a system's overall heat content and is equal to the system's internal energy plus the sum of its volume and pressure.

The amount of heat released or absorbed during a reaction that takes place under constant pressure is referred to as the enthalpy change. The sign for it is H, which can be read as "delta H." If the system's enthalpy drops relative to the reaction, the reaction is preferred. A balanced chemical equation is followed by and on the same line as the enthalpy change for the reaction.

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The observed appearance of the cells after adding the 10% NaCl is likely due to the hypertonicity of the solution.

hypertonicity refers to a solution that has a higher solute concentration than the cell, causing water to flow out of the cell and the cell to shrink and become dehydrated. This can also be observed as the cells appear to be wrinkled and contracted.This can cause water to move out of the cell due to osmosis, resulting in the cell becoming dehydrated and shrinking. This is the opposite of hypotonicity, which is a solution with a lower solute concentration, causing water to move into the cell, causing the cell to swell. In biological systems, hypertonicity can cause cells to lose function or even die if the condition is severe or prolonged.

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The mass(in grams) of iron, Fe produced from the 92.5g of iron (ii) oxide, FeO is 71.9 grams

The mass of Fe produced from the 92.5g of iron (ii) oxide, FeO can be obtained as follow:

2FeO → 2Fe + O₂

From the balanced equation above,

143.7 g of FeO reacted to produce 111.7 g of Fe

Therefore,

92.5 g of Fe will react to produce = (92.5 × 111.7) / 143.7 = 71.9 g of Fe

Thus, the mass of Fe produced from the reaction is 71.9 grams

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Complete question:

How many grams of Fe are produced from 92.5 g of FeO given the following reaction 2FeO → 2Fe + O₂

Answer

The balanced complete ionic equation is:

Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s) + 2Na⁺(aq) + SO₄²⁻(aq)

The net ionic equation is:

Mg²⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s)

Explanation

When aqueous NaOH and MgSO4 are combined, solid Mg(OH)2 and aqueous Na2SO4.

The balanced complete molecular equation for the precipitation reaction is:

MgSO₄(aq) + 2NaOH(aq) → Mg(OH)₂(s) + Na₂SO₄(aq)

The balanced complete ionic equation for the precipitation reaction is:

Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s) + 2Na⁺(aq) + SO₄²⁻(aq)

The spectator ions are SO₄²⁻(aq) and Na⁺(aq). Therefore, condensing the complete ionic equation will result in a net ionic equation given below:

Mg²⁺(aq) + 2OH⁻(aq) → Mg(OH)₂(s)

To calculate the moles of H+ and OH-, you need to know the concentration of the solution in terms of its pH or pOH value.

When you get the pH of the solution, you can use this formula to calculate the concentration of H+ ions: [H+] = 10^(-pH)

Also, if you know the pOH of the solution, you can use this formula to calculate the concentration of OH- ions: [OH-] = 10^(-pOH)

Having determined the concentration of H+ and OH- ions, the molarity formula can be used to calculate the number of moles of each ion as follows: moles = concentration (in mol/L) x volume (in L)

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Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Answer:

2

Explanation:

so let say 5.0/100×40

that is 2

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The percent by mass is the estimation of the solute present in the solution or the substance. The percent by mass of 5 gm solute is calculated to be 11.11%.

The percent by mass is defined as the division of the mass of the solute of the element by the mass of the compound or the solution as the whole. The formula for percent by mass is given as:

mass percent = (mass of solute ÷ total mass of compound or solution) x 100%

The mass of the solute has been the numerator and the mass of the solution has been the denominator that must be multiplied by 100 to get the percent by mass or mass percentage. It is represented using %.

Given,

Mass of solute = 5.00 grams

Mass of compound (solution) = solute + water

= 40.0 grams + 5.00 grams

= 45.00 grams

Substituting the values above as:

mass percent = (mass of solute ÷ total mass of compound or solution) x 100%

The percent by mass = (5.00 ÷ 45.00) x 100%

= 11.11 %

Therefore, 11.11 % is the percent by a mass of 5.00-gram solute dissolved in 40.0 grams of water.

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This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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