To fill the valence shell, an electrically neutral, unbonded atom with atomic number 8 must add.

Answer:

V = 100 ml

Explanation:

P1V1 = P2V2

P1 = 2.0 atm

V1 = 200ml

P2 = 4.0 atm

V2 = ?

(2.0)(200) = (4.0)V2

400 = (4.0)V2

V2 = 100

The new pressure will be

1000 L

, rounded to one significant figure.

Explanation:

Boyle's law states that when a gas is held at a constant temperature and mass in a closed container, the volume and pressure vary inversely. The equation to use is

P

1

V

1

=

P

2

V

2

.

Given

V

1

=

200

mL

×

1

L

1000

mL

=

0.2 L

P

1

=

700 mmHg

V

2

=

100

mL

×

1

L

1000

mL

=

0.1 L

Unknown

P

2

Equation

P

1

V

1

=

P

2

V

2

Solution

Rearrange the equation to isolate

P

2

and solve.

P

2

=

P

1

V

1

V

2

P

2

=

(

700

mmHg

×

0.2

L

)

0.1

L

=

1400 L

, which must be rounded to

1000 L

because all of the measurements have only one significant figure

By performing the necessary calculations and comparing the Q/K ratios, we can determine whether calcite or dolomite would form first in the given water sample with [Mg2+]∼0.10 mmol/L.

To determine which mineral, calcite or dolomite, would form first in the given water sample with [Mg2+]∼0.10 mmol/L, we need to calculate the saturation index (SI) for each mineral by comparing the Q/K ratios. The mineral with the higher SI will be more likely to precipitate first.

The saturation index (SI) is calculated by comparing the ion activity product (Q) with the equilibrium constant (K) for a particular mineral. In this case, we have the equilibrium reaction: CaMg(CO3​)2​⇌Ca2++Mg2++2CO3​2−.

For calcite, the Q/K ratio can be calculated using the concentration of Ca2+ and CO3​2− ions in the water sample. Since dolomite contains both Ca2+ and Mg2+ ions, we need to consider the concentration of Mg2+ as well.

By comparing the Q/K ratios for calcite and dolomite, we can determine which mineral has a higher saturation index (SI). The mineral with the higher SI will be more likely to precipitate first.

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

What is vapor pressure?

Vapor pressure , or equilibrium vapor pressure, is the pressure produced by a vapor in thermodynamic equilibrium with a condensed phase (solid or liquid) at a given temperature. Defined as applied pressure. temperature in a closed system. Equilibrium vapor pressure is a measure of the evaporation rate of a liquid. This refers to the tendency of particles to escape from liquids (or solids). Substances that have a high vapor pressure at room temperature are often called volatile. The pressure that vapor exerts on the liquid surface is known as vapor pressure. As the temperature of a liquid increases, so does the kinetic energy of its molecules. As the kinetic energy of the molecules increases, the number of molecules that become vapor also increases, increasing the vapor pressure.

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

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False. Potassium-argon dating is a radiometric dating technique used to determine the age of rocks and minerals.

It is based on the decay of the isotope potassium-40 (K-40) into argon-40 (Ar-40) over time. This dating method is particularly useful for dating volcanic rocks and minerals because the K-40 is commonly found in them.

Potassium-argon dating is not limited to organic materials. In fact, it is primarily used for dating inorganic substances like rocks and minerals. The method relies on the measurement of the ratio of K-40 to Ar-40 in a sample. By comparing this ratio to the known decay rate of K-40, scientists can calculate the age of the rock or mineral.

While other dating methods like radiocarbon dating are specifically designed for organic materials, potassium-argon dating is uniquely suited for dating non-organic substances, making it an important tool in geological and archaeological research.

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Answer:

1. at least two charged interacting parts

2. from the electric fields of charged subatomic particles

3 an arrow released from the bow

4Electrical fields of charged particles interact, bonding those with opposite charges.

5 the interaction of the electric fields of protons and electrons

6 The energy stored in the system increases.

7 Kinetic energy increases because the magnets move in the direction of the field.

8 Iron pieces accelerate toward the magnet, and the energy stored in the system decreases.

9  

The energy stored in the field decreases because the magnet moves in the direction of the field.

10 The energy stored increases and then decreases.

11 The wire was not connected to the source.

12  The electromagnet will become more powerful.

From the electric fields of charged subatomic particles, at least two charged interacting pieces, an arrow launched from the bow, Interaction between electrical fields of charged particles bonds those with opposing charges, the interaction between the protons' and electrons' electric fields.

An electric field is a physical field that surrounds electrically charged particles and acts as an attractor or repellent to all other charged particles in the vicinity. It can also refer to a system of charged particles' physical field.

The area of space surrounding an electrically charged particle or object in which the charge body perceives force is known as the electric field. Examples: -Charges and their arrangements, such as capacitors and battery cells, produce electric fields.

We can produce current flow by applying the pushing force required by electric fields. A circuit's electric field resembles an electron pump in that it is a sizable source of negative charges that can drive electrons.

Thus, From the electric fields of charged subatomic particles, at least two charged interacting pieces.

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In addition to providing the same information just like its molecular formula, a compound's structural formula also reveals the atoms' connections inside the molecule.

The number of atoms from each element in a single chemical molecule is specified by the molecular formula. It displays the precise number of atoms in a molecule. For instance, the chemical structure of propane is C4H10. The provided compound contains 10 hydrogen atoms and 4 carbon atoms according to this formula.

Empirical formulae reveal the simplest or the most reduced ratio of components in a compound while molecular formulas reveal how many atoms from each element are present in a complex. The empirical formula and the molecular formula of a substance are identical if the molecular formula could be decreased further.

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Answer:

3,000,000,000

Explanation:

3 x (10⁹)=

3 x (1,000,000,000)

= 3,000,000,000

The estimated boiling point of water atop Denali mountain is approximately -267.46°C.

First, we convert the given atmospheric pressure from torr to atm:

657 torr / 760 torr/atm ≈ 0.865 atm

Next, we use the Clausius-Clapeyron equation to relate the boiling point of a substance to its vapor pressure:

                 ln(P₂/P₁) = (ΔH_vap/R) * (1/T₁ - 1/T₂)

where P₁ and T₁ are the reference pressure and boiling point, P₂ is the reduced pressure atop Denali (0.865 atm), ΔH_vap is the enthalpy of vaporization of water (40.7 kJ/mol), R is the ideal gas constant (0.0821 L·atm/(mol·K)), and T₂ is the boiling point we want to determine.

We can assume the reference boiling point of water at normal atmospheric pressure (1 atm) to be 100°C or 373 K.

Solving the equation for T₂:

ln(0.865/1) = (40.7 kJ/mol / (0.0821 L·atm/(mol·K))) * (1/373 - 1/T₂)

0.865 = 4.95 * (1/373 - 1/T₂)

1/T₂ = (0.865 / (4.95 * 0.865)) + 1/373

1/T₂ ≈ 0.173 + 0.00268

1/T₂ ≈ 0.17568

T₂ ≈ 1/0.17568

T₂ ≈ 5.69 K

Converting back to Celsius:

T₂ ≈ 5.69 - 273.15 ≈ -267.46°C

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The relative atomic mass of an element R with two isotopes 63R and 65R is 63.64.

Relative atomic mass is the ratio of the average mass per atom of the naturally occurring form of an element to 1/12 of the mass of a carbon-12 atom.

The relative atomic mass (RAM) of an element with two isotopes can be calculated by multiplying the mass of each isotope by its respective percentage abundance as follows:

RAM = (63 × 0.68) + (65 × 0.32)

RAM = 42.84 + 20.8

RAM = 63.64

Therefore, 63.64 is the relative atomic mass of the element R.

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50.0 mL of 0.500 M HCN and 25.0 mL of 0.500 M sodium hydroxide combination can be used to make a buffer with a pH of 4.2. The KK

an of benzoic acid, C6H5COOH, is 6.5×10-5 and the an of hydrocyanic acid, HCN, is 4.9×10-10.

Benzoic acid

A white (or colourless) solid with the chemical formula C6H5CO2H, benzoic acid is pronounced: "bnzo.k." The simplest aromatic carboxylic acid is this one. The term comes from gum benzoin, which was the substance's exclusive source for a very long period. Many plants naturally contain benzoic acid, which is used as an intermediary in the formation of numerous secondary metabolites[9]. Benzoic acid salts are employed as food preservatives. An essential starting point for the industrial synthesis of many other chemical compounds is benzoic acid. The term "benzoates" refers to the salts and esters of benzoic acid.

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Explanation:

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

E(343C)

Final temperature at 9L is 343C or 616K

We can solve this question using Charles law:

At constant pressure, Volume(in L) is directly proportional to temperature(in Kelvin).

                               V/T= constant

Given,

At 35c=273+35= 308K, volume= 4.5L

Current volume=9L

As per above law,

308k/4.5L=T/9L

⇒T= (9*308)/4.5 (in K)

⇒T= 2*308

∴T = 616K or 343C(616-273=343)

Hence final temperature =616K/343C

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After an experiment, leftover reagents and products should be handled and disposed of properly to ensure safety and environmental responsibility.

Here are guidelines on what to do with leftover reagents and products:

It is important to prioritize safety and environmental considerations when handling and disposing of leftover reagents and products. Follow the guidelines provided by your institution, regulatory agencies, and local waste management authorities to ensure proper handling and disposal practices.

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After an experiment, leftover reagents and products should be handled and disposed of properly to ensure safety and environmental responsibility.

Here are guidelines on what to do with leftover reagents and products:

Leftover Reagents

If the reagent is still usable and stable, you may consider storing it appropriately for future use. Make sure to label the container clearly with the reagent's identity, concentration, and date.

If the reagent is no longer needed or has expired, check if it can be safely disposed of down the sink or in regular waste according to local regulations and guidelines. Some reagents may require special disposal procedures due to their hazardous nature.

If the reagent is hazardous or poses a risk to human health or the environment, it should be handled as hazardous waste. Contact your institution or a local waste management facility for guidance on proper disposal methods for hazardous waste.

Products of an Experiment:

If the products are desired and have value, they can be collected, purified, and stored for further use or analysis.

If the products are not needed or have no further use, check if they can be safely disposed of down the sink or in regular waste following local regulations.

If the products are hazardous, toxic, or potentially harmful, they should be treated as hazardous waste. Contact your institution or a local waste management facility for guidance on proper disposal methods for hazardous waste.

It is important to prioritize safety and environmental considerations when handling and disposing of leftover reagents and products. Follow the guidelines provided by your institution, regulatory agencies, and local waste management authorities to ensure proper handling and disposal practices.

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The missing component in the acid wave process is the activator or the catalyst. The activator is a solution that helps to initiate the chemical reaction between the permanent waving lotion and the hair's proteins.

In detail, the acid wave process is a chemical process that involves the use of an acid-based solution to break down the hair's disulfide bonds, which determine the hair's natural texture and shape. The permanent waving lotion contains an acid (usually glyceryl mono thioglycolate) that softens the hair and makes it pliable. Once the permanent waving lotion has been applied, the activator is added to the hair, which helps to open up the disulfide bonds further.

The activator is usually a solution of hydrogen peroxide or sodium bromate. After a certain amount of time, the hair is rinsed thoroughly to remove any residual permanent waving lotion or activator. Finally, the neutralizer is applied to the hair. The neutralizer (usually ammonium thioglycolate) stops the chemical reaction between the hair and the waving lotion. It helps to restore the hair's pH balance and re-form the disulfide bonds in a new shape.

The neutralizer is left on the hair for a specified amount of time, and then the hair is rinsed and styled. In conclusion, the three components of the acid wave process are the permanent waving lotion, activator, and neutralizer. Each component plays a vital role in breaking down and reforming the disulfide bonds in the hair to create a new texture and shape.

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Answer:

i dont know

Explanation:

Answer:

Silicon conducts electricity as well as copper does.

Explanation:

you didn't gave any statements to choose the answer from.

but otherwise, what all I my knowledge says that Silicon conducts electricity as well as copper does.

Answer:

mineral

vitamins

carbohydrates

protien

fat

Answer: An applied force of 50 N is used to accelerate an object to the right across. A 5-kg object is sliding to the right and encountering a friction force that slows it down. Explanation: m=1000 kg and a=3m/s2 . hence, the force needed to accelerate the 1000kg car by 3m/s2 is 3000N

Explanation: PLEASE MARK  ME AS BRAINLIEST

Answer:

electron are on the outside of the nucleus and form rings

Explanation:

The statement that corresponds to the drawing of a girl in a record store with headphones on is " Ella oye música." The correct statement is B.

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The major metabolic step occurring when a molecule of carbon dioxide from the atmosphere combines with a 5-carbon sugar in the stroma is called carbon fixation which is the first step of the Calvin cycle in the process of photosynthesis, which takes place in the chloroplasts of plants cells.

In Carbon Fixation, the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) catalyzes the reaction between carbon dioxide and ribulose-1,5-bisphosphate (RuBP), a 5-carbon sugar, to produce 3-phosphoglycerate.

During photosynthesis, plants capture carbon dioxide (\(CO_{2}\)) from the atmosphere and use it to synthesize organic molecules, such as sugars, in a series of chemical reactions that take place in the chloroplasts of plant cells. One of the first steps in this process is carbon fixation, where carbon dioxide molecules are converted into an organic molecules through a series of enzyme-catalyzed reactions.

In the scenario mentioned, a molecule of carbon dioxide from the atmosphere combines with a 5-carbon sugar molecule in the stroma (the fluid-filled space within the chloroplasts), leading to the formation of a larger organic molecule. This is an example of carbon fixation, where carbon dioxide is incorporated into an organic molecule, initiating the synthesis of complex organic compounds through subsequent metabolic steps in the photosynthesis pathway.

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Benzaldehyde reacts with sodium hydroxide to form sodium benzoate and hydrogen gas.

Benzaldehyde reacts with sodium hydroxide to form sodium benzoate and hydrogen gas. This reaction is an example of an esterification reaction, wherein a carboxylic acid reacts with an alcohol to form an ester and water. In this case, benzaldehyde, a carboxylic acid, is the reactant, and sodium hydroxide, an alcohol, is the other reactant.

The products of this reaction are sodium benzoate, an ester, and hydrogen gas. The formation of hydrogen gas during this reaction indicates the presence of an acid-base reaction. This reaction is an important one in the synthesis of many chemicals.

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Answer:

the answer is 4.9×10-10M

a) The Lennard-Jones potential predicts the separation r_eq at the minimum energy U_min.

b) The U_min for this interaction at T=298 K is the value obtained from the Lennard-Jones potential equation when r=r_eq.

c) The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the attractive part (-A/r^6) to the total potential energy U_min.

d) The ratio of r_eq to r_0, where u(r_0)=0.4, can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

e) The ratio of r_s to r_0, where r_s is the separation where the magnitude of the attractive adhesion force is maximum, can be determined by finding the value of r where the derivative of the potential energy with respect to r is equal to zero.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the potential energy equation with respect to r and evaluating it at r=r_s.

a) The Lennard-Jones potential provides information about the relationship between energy and separation between two interacting atoms.

At the minimum energy (U_min), the potential predicts the separation r_eq, which corresponds to the equilibrium distance between the atoms. This is the distance at which the energy of the system is at its lowest point.

b) To determine the value of U_min at a given temperature (T=298 K), you can substitute the equilibrium separation r_eq into the Lennard-Jones potential equation and calculate the resulting energy value.

This will give you the U_min for the interaction.

c) The Lennard-Jones potential consists of two components: an attractive component (-A/r^6) and a repulsive component (B/r^12).

The ratio of U_min to the purely attractive van der Waals component of the interaction potential at r_eq can be calculated by comparing the magnitude of the attractive component to the total potential energy at the equilibrium separation.

This ratio provides insights into the relative contribution of the attractive force to the overall potential energy at equilibrium.

d) The ratio of r_eq to r_0 can be determined by finding the value of r_eq where the potential energy is equal to 0.4 times the total potential energy at r=r_0.

In other words, you need to solve the Lennard-Jones potential equation for r_eq when the potential energy is equal to 0.4 times the potential energy at r=r_0.

e) The ratio of r_s to r_0 is obtained by finding the value of r where the magnitude of the attractive adhesion force is maximum.

This can be determined by finding the separation r where the derivative of the potential energy equation with respect to r is equal to zero.

The value of r_s represents the separation at which the attractive force between the atoms is strongest.

f) The value of F_max between the two atoms can be obtained by taking the negative derivative of the Lennard-Jones potential energy equation with respect to r and evaluating it at r=r_s.

This will give you the magnitude of the maximum attractive adhesion force between the atoms.

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Match each subatomic particle with the correct descriptions

Has a positive charge - proton

Has a negative charge - electron

Has a neutral charge = neutron

Found in nucleus of atom - proton and electron

Mass of 1 AMU - proton and neutron

Subatomic particle are the particle which is smaller than atom in size or of or relating to the inside of the atom

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NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆ H:255.95

Given

Reaction and the enthalpy

Required

The change of enthalpy

Solution

Reaction 1

N2 (g) + 3H2 (g) --> 2NH3 ∆ H: -91.8 kJ/mol⇒reverse

2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol

Reaction 2

C (s, graphite) + 2H2 (g)⇒ CH4 (g) ∆H: -74.9 kJ/mol ⇒reverse

CH4 (g) ⇒ C (s, graphite) + 2H2 (g) ∆H: +74.9 kJ/mol ⇒ x2

2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mo

Reaction 3

H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g);∆ H: +270.3 kJ/mol

Add up all the reactions and remove the same compound from different sides :

2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol

2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mol

H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g) ∆ H: +270.3 kJ/mol

-----------------------------------------------------------------------------------------

2NH3(g) + 2CH4(g) ⇒ 2HCN + 6H2 ∆ H: 511.9 ⇒ :2

NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆ H:255.95

In the titration of a 24.2 mL sample of a 0.349 M aqueous acetic acid solution with a 0.308 M aqueous barium hydroxide solution, the pH of the solution at the equivalence point is roughly 10.33.

At the equivalence point of the titration of acetic acid with barium hydroxide, all of the acid has reacted with the base to form the salt, barium acetate (Ba(CH₃COO)₂), and water. This means that the solution contains only the conjugate base, acetate ion (CH3COO⁻), and hydroxide ions (OH⁻), which combine to form water. The balanced equation for the reaction at the equivalence point is:

CH3COO⁻ + OH⁻ → H₂O + CH3COO⁻

To find the concentration of hydroxide ions at the equivalence point, we can use the stoichiometry of the reaction:

1 mole of Ba(OH)₂ reacts with 2 moles of CH₃COOH to form 2 moles of CH3COO⁻

Therefore, the moles of Ba(OH)₂ required to reach the equivalence point are:

moles of Ba(OH)₂ = 2 x moles of CH₃COOH = 2 x 8.43 x 10⁻³ mol = 1.69 x 10⁻² mol

The volume of Ba(OH)₂ solution required to reach the equivalence point can be found using the concentration and the moles of Ba(OH)₂:

volume of Ba(OH)₂ = moles of Ba(OH)₂ / concentration of Ba(OH)₂ = 1.69 x 10⁻² mol / 0.308 mol/L = 54.87 mL

Since we started with 24.2 mL of acetic acid solution, the total volume of the solution at the equivalence point is 24.2 mL + 54.87 mL = 79.07 mL.

The concentration of acetate ion at the equivalence point can be calculated using the stoichiometry of the reaction:

moles of CH3COO⁻ = moles of Ba(OH)₂ = 1.69 x 10⁻² mol

concentration of CH3COO⁻ = moles of CH3COO⁻ / volume of solution = 1.69 x 10⁻² mol / 79.07 mL = 0.214 M

The concentration of hydroxide ion can be calculated from the ion product of water (Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴) and the concentration of acetate ion:

[OH⁻] = Kw / [CH3COO⁻] = 1.0 x 10⁻¹⁴ / 0.214 M = 4.67 x 10⁻¹⁴M

Therefore, the pH at the equivalence point can be calculated as:

pH = 14.00 - pOH = 14.00 - log[OH⁻] = 14.00 - log(4.67 x 10⁻¹⁴) ≈ 10.33

Thus, the pH of the solution at the equivalence point in the titration of a 24.2 mL sample of a 0.349 M aqueous acetic acid solution with a 0.308 M aqueous barium hydroxide solution is approximately 10.33.

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Electronegativity is the ability of an atom to attract electrons towards itself. When moving from left to right within a period, the electronegativity of elements increases. As a result, the atomic radius decreases, and the electronegativity increases. Therefore, the correct answer is b) increases, stays the same.

This is due to the increase in the number of protons in the nucleus, which results in a greater pull on the electrons in the valence shell. As a result, the atomic radius decreases, and the electronegativity increases.
When moving from top to bottom within a group, electronegativity generally decreases. This is because the number of energy levels increases, which means that the valence electrons are farther away from the nucleus. As a result, the pull of the nucleus on the valence electrons decreases, making it easier for other atoms to attract those electrons. There are a few exceptions, however, such as the noble gases, where electronegativity stays the same since they have a complete valence shell. In conclusion, the correct answer is b) increases, stays the same.

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The complete balanced equation for the neutralization reaction between HCl and NaHCO₃ is:

HCl + NaHCO₃ → NaCl + H₂O + CO₂

The reaction between hydrochloric acid (HCl) and sodium bicarbonate (NaHCO₃) is known as a neutralization reaction. In this reaction, HCl and NaHCO₃ combine to produce NaCl, water, and carbon dioxide.

The reaction can be represented by the following equation: HCl + NaHCO₃ → NaCl + H₂O + CO₂

This reaction already the balanced chemical equation for the reaction since the number of each element in the reactant side is equal to the number of each element in the product side.

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Answer:

25.0 kJ

Explanation:

6.01 kj/mole heat of fusion.  Since this has the unit of moles, we need to convert 75.0 grams of water to moles of water:

(75.0 grams)/(18.0 grams/mole) = 4.17 moles H2O.

q = n(6.01 kj/mole)

q = (4.17 moles)(6.01 kj/mole)

q = 25.0 kJ

Answer:

Incomplete combustion of carbon occurs if enough air is not available to convert all of it to carbon dioxide, and in such as case carbon monoxide is formed by the addition of half the amount of oxygen as is present in carbon dioxide, to the carbon atom, namely, CO instead of CO2.

Explanation: