he standard enthalpy of combustion of cyclopropane, c3h6, is −2091 kj mol−1 at 298 k. calculate the standard enthalpy of formation of cyclopropane at 298 k (20 marks) (ii) the enthalpy of formation of propene, ch3ch

• The balanced equation for the reaction is given by:

• From the above reaction we can see that:

1 mole of ethanol (CH3Ch2OH) produces 1 mol of acetic acid(CH3COOH)

so . x mole of ethanol will produce 0.9mol of acetic acid ....(cross multiply)

xmol ethanol * 1mol acetic = 1mol ethamol* 0.9molacetic

∴ xmol ethanol = 1*0.9 /1

= 0.90 mol

• This means that, 0.90 mol of ethanol, is needed to produce 0.9mol acetic acid,.

Water has a higher surface tension than most liquids because of hydrogen  bonds its molecules form.

Water has a higher surface tension than other liquids due to the relatively high molecular or strong cohesive interactions that occur between its molecules. Hydrogen bonds also make it possible for water molecules to strongly adhere to one another and resist stretching.

The formed links are known as hydrogen bonds, and they cause the water molecules to stick together tightly and have a high surface tension.

A robust and flexible lattice of water molecules is created when several water molecules form hydrogen bonds with one another. High surface tension results from this. Water striders may move across the water's surface thanks to surface tension.

To know more about surface tension, visit,

https://brainly.com/question/138724

#SPJ4

Answer:

the electron has a negative charge and is found outside the nucleus

Answer:

See attached image.

Explanation:

See attached image.

Remember to use the units in deciding steps to take.  Find the moles needed or delivered by using:

Molarity x Volume = moles  [(moles/L)*(L) = moles]

Molarity, M, is dedined as 1 mole/liter.  When working with a unit such as 6M, rewite it as 6 moles/liter, and then use unit conversions to guide how to find the solution, so to speak.

The main chemical compound in marijuana that has a harmful effect on cells lining the airways is tetrahydrocannabinol, or THC. This compound is similar to nicotine, which is the primary harmful chemical compound in cigarette smoke.

In addition to THC, marijuana smoke also contains more tar than cigarette smoke. Tar is made up of small particles that are easily inhaled and are known to be carcinogenic. The combination of the THC, nicotine, and tar in marijuana smoke is what makes it so damaging to cells lining the airways.

The daily smoking of one marijuana joint is equivalent to the amount of damage to cells lining the airways as around five cigarettes.

To know more about cigarettes, visit;

https://brainly.com/question/30902635

#SPJ1

Radiation occurs when an electron in an atom jumps from a lower energy orbital to a higher energy orbital.

Define electrons.

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically regarded to be elementary particles.

Energy released by matter as rays or swift particles is known as radiation. Atoms make up all physical matter. The nucleus of an atom includes tiny particles called protons and neutrons, and the outer shell of the atom is made up of other particles called electrons.

An electron loses a significant portion of its energy through a radiative nuclear interaction at extremely high speeds.

To learn more about radiation use:

https://brainly.com/question/31285748

#SPJ4

Answer: Im not, sure if this is right, but I personally think that the Answer, to your question is TRUE!

Explanation: But Dont just take my word for it as I am not sure, Myself. I only made a guess.

Answer:

flourine

Explanation:

im not sure the answer

Answer:

b

Explanation:

gitcy is good for your spleen

The other relationship that will have a similar graph is volume versus temperature, because they are also directly proportional according to Charles's Law.

Charles's Law is a gas law that states that the volume of a fixed mass of gas at a constant pressure is directly proportional to its absolute temperature.

This means that as the temperature of a gas increases, the volume of the gas will also increase proportionally, and as the temperature of a gas decreases, the volume of the gas will decrease proportionally.

Therefore, if a graph of gas pressure versus the number of particles in a container is a straight line, a graph of volume versus temperature will have a similar shape and be directly proportional, because they are both affected by changes in temperature.

Learn more about Charles's Law at:

https://brainly.com/question/16927784

#SPJ7

The percent composition of the herbicide is 44.5% C, 6.27% H, 22.9% Cl, and 26.4% N.

To solve this problem, we will use the information provided to calculate the percent composition of the herbicide.

First, let's calculate the number of moles of CO2 and H2O produced by the combustion of the herbicide. We can use the ideal gas law to do this:

n_CO2 = (156.9 mL) / (22.4 L/mol) * (1 mol CO2 / 1 L) = 7.00 mol CO2

n_H2O = (91.52 mL) / (22.4 L/mol) * (1 mol H2O / 1 L) = 4.08 mol H2O

Next, let's calculate the number of moles of carbon, hydrogen, and nitrogen in the herbicide using the combustion reaction:

C_xH_yCl_zN_w + (x + y/4 - z/2) O2 → x CO2 + (y/2) H2O + z HCl + w NO2

From the balanced equation, we can see that the number of moles of CO2 produced is equal to the number of moles of carbon in the herbicide, and the number of moles of H2O produced is equal to the number of moles of hydrogen in the herbicide.

We can use this information to solve for the number of moles of carbon, hydrogen, and nitrogen in the herbicide:

n_C = 7.00 mol CO2

n_H = 8.16 mol H2O

n_Cl = 41.36 mg / 35.45 g/mol / 0.1500 g = 0.767 mol Cl

Since the herbicide contains no other elements besides C, H, Cl, and N, we can assume that the mass of the herbicide is equal to the sum of the masses of these elements. We can use this information to solve for the mass of the herbicide:

m_Herbicide = m_C + m_H + m_Cl + m_N

m_Herbicide = n_C * 12.01 g/mol + n_H * 1.008 g/mol + n_Cl * 35.45 g/mol + n_N * 14.01 g/mol

We can rearrange this equation to solve for the percent composition of the herbicide:

% C = (n_C * 12.01 g/mol / m_Herbicide) * 100% = 44.5%

% H = (n_H * 1.008 g/mol / m_Herbicide) * 100% = 6.27%

% Cl = (n_Cl * 35.45 g/mol / m_Herbicide) * 100% = 22.9%

% N = ((m_Herbicide - n_C * 12.01 g/mol - n_H * 1.008 g/mol - n_Cl * 35.45 g/mol) / m_Herbicide) * 100% = 26.4%

to know more about herbicides refer here:

https://brainly.com/question/31375814#

#SPJ11

Answer:

6.273×10²³

Explanation:

hope this is useful friend

Answer:

6.023 × 10²³

Explanation:

Avogadro's number is used for calculating masses and moles and can applied to Stoichiometry. Avogadro's number is useful for atoms and molecules

The mass of zinc, Zn required to generate 0.15 mole of H₂, given the reaction is 9.807 grams

Let us consider the balanced equation to obtain useful information.

Zn + 2HCl -> ZnCl₂ + H₂

From the balanced equation above,

1 mole of H₂ was obtained from 1 mole of Zn

Therefore,

0.15 mole of H₂ will also be obtained from 0.15 mole of Zn.

Finally, we can obtain the mass of zinc, Zn required as follow:

Mole = mass / molar mass

1.15 = Mass of zinc, Zn / 65.38

Cross multiply

Mass of zinc, Zn = 0.15 × 65.38

Mass of zinc, Zn = 9.807 grams

Thus, the mass of zinc, Zn required is 9.807 grams

Learn more about mass:

https://brainly.com/question/21940152

#SPJ1

In a shallow cylindrical lake with a radius of 4 km and an average water height of 5 m, a type A exhaust basin recorded a total water loss of 4.5 cm during a summer month.

The task is to calculate the evaporation of the lake and the volume of lake water in cubic meters for that specific time period, assuming an evaporation coefficient of 0.7. To calculate the evaporation of the lake, we first convert the recorded water loss from centimeters to meters. The total water loss is 4.5 cm, which is equal to 0.045 meters.

The evaporation from the lake can be determined by multiplying the water loss by the evaporation coefficient. In this case, the evaporation coefficient is given as 0.7. So, the evaporation from the lake is calculated as:

Evaporation = Water loss * Evaporation coefficient

Evaporation = 0.045 m * 0.7 = 0.0315 m

Therefore, the evaporation of the lake during the specified time period is 0.0315 cubic meters.To calculate the volume of lake water, we need to consider the shape of the lake, which is a shallow cylinder. The formula for the volume of a cylinder is:

Volume = π * radius^2 * height

Given that the radius of the lake is 4 km (4000 m) and the average water height is 5 m, we can calculate the volume of the lake as:

Volume = π * (4000 m)^2 * 5 m = 251,327,412 m^3

Therefore, the volume of lake water for the specific time period is approximately 251,327,412 cubic meters.

Learn more about evaporation here:- brainly.com/question/28319650

#SPJ11

Answer:

I believe it may be-

1. Series

2. Parallel

3. Parallel

4. Series

Explanation:

In a series circuit, electricity only has one path to follow while a parallel circuit has more than one path to follow.

The heaviest element that was created in the Big Bang is lithium (option c).

During the early stages of the universe, known as Big Bang nucleosynthesis, the conditions were hot and dense enough for the fusion of protons and neutrons to form light elements. While hydrogen and helium were the most abundant elements produced, a small amount of lithium-7 was also synthesized. However, the production of heavier elements through fusion processes required the later formation of stars and subsequent stellar nucleosynthesis.

Hence, the correct option is option c.

Learn more about the big bang here:

https://brainly.com/question/17209127

#SPJ 4

Answer: 0.00048

m

o

l

Explanation:

Moles = Mass/Molar mass

n

=

m

M

r

=

0.0688

107.87

+

35.5

=

0.00048

m

o

l

Answer:

( B, C, E, F)

Explanation:

Person above is right!

But I hope this helps!!

Intravenous IV pressure infusers, Airway suction units, full spine immobilization devices, and cardboard splints are required for Emergency Medical Technicians.

A medical worker known as a medical technician supports doctors and hospitals and hence plays a crucial role in the healthcare sector. They have various important roles during medical emergencies.

They are in charge of duties like checking blood in labs or physiological fluids like perspiration or tissue samples so doctors can decide on treatment options in a well-informed manner.

Intravenous IV pressure infusers, Airway suction units, full spine immobilization devices, and cardboard splints units are required for Emergency Medical Technicians. Hence, options B, C, E, and F are correct.

Learn more about medical technicians, here:

https://brainly.com/question/30300094

#SPJ5

Answer. Speed is the rate of change of position expressed as distance travelled per unit of time

give brainliest if right

Answer:

distance

Explanation:

When solution aqueous solutions of Barium chloride and Sodium sulphate are mixed, here Sodium and Chloride ions are spectator ions as their state does not change in this reaction.

Spectator ions in any reactions are the ions who does not participate in the particular reaction. The state of these ions is same throughout the reaction. The charges on these ions remains same they do not get oxidized or reduced. Spectator ions do not get precipitate in any reaction. They can be cancelled from both side of the reaction. When aqueous solutions of Barium chloride and Sodium sulphate reacts, the resultant product will be Barium chloride and Sodium sulphate. It is an example of double displacement reaction.

Learn more about spectator ions here:

https://brainly.com/question/28913274

#SPJ4

Answer:

b)sugar and water : Sedementation

d) salt and water : evaporation

Answer:

Fe(C₂H₃O₂)₃,  Fe(CN)₃,  Pb(C₂H₃O₂)₄,  Pb(CN)₄

Explanation:

Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.

1.) Fe(C₂H₃O₂)₃

-----> Fe³⁺ and C₂H₃O₂⁻

-----> +3 + (-1) + (-1) + (-1) = 0

2.) Fe(CN)₃

-----> Fe³⁺ and CN⁻

-----> +3 + (-1) + (-1) + (-1) = 0

3.) Pb(C₂H₃O₂)₄

-----> Pb⁴⁺ and C₂H₃O₂⁻

-----> +4 + (-1) + (-1) + (-1) + (-1) = 0

4.) Pb(CN)₄

-----> Pb⁴⁺ and CN⁻

-----> +4 + (-1) + (-1) + (-1) + (-1) = 0

Answer:

340 grams Ca₃P₂ (2 sig. figs.)

Explanation:

   3Ca     +     2P     =>    Ca₃P₂

5.6 mole + excess =>   ? grams

Convert the 'known' to a coefficient of 1 by dividing all coefficients by 3.

=>  Ca   +   2/3P   =>    1/3Ca₃P₂

From the above, 1 mole of Ca => 1/3 mole Ca₃P₂  

∴ 5.6 mole Ca in an excess of P => 1/3(5.6 mole) Ca₃P₂

=> 1.8666 mol Ca₃P₂ (calculator answer) ≅ 1.9 mol Ca₃P₂

=> 1.9 mole x 182 g Ca₃P₂/mol Ca₃P₂ = 339.73333 grams Ca₃P₂

≅ 340 grams Ca₃P₂ (2 sig. figs.)

Answer

A. Decomposition.

Explanation

A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

The equilibrium concentrations are approximately:

[H2] = 0 M

[Br2] = 0 M

[HBr] = 0.668 M.

At equilibrium, the equilibrium constant, K, indicates the connection between the reactants and products of a reaction. When the rates of forwarding and backward reactions are equal, a reaction has reached equilibrium.

The equilibrium constant expression for the reaction is:

Kc = [HBr]^2 / ([H2] * [Br2])

We are given that Kc = 2.180 × 10^6 at 730°C. We can use this information to set up an ICE (initial, change, equilibrium) table and solve for the equilibrium concentrations of the three species.

Initial concentrations:

[HBr] = 5.20 mol / 18.7 L = 0.278 M (since 2HBr are formed from 1 mol Br2 and 1 mol H2, initial [Br2] and [H2] are both 0)

Change in concentrations:

Let x be the change in concentration of HBr. Then, the change in concentration of H2 and Br2 will be -2x and -x, respectively.

Equilibrium concentrations:

[H2] = 0 - 2x

[Br2] = 0 - x

[HBr] = 0.278 + x

Substituting these concentrations into the equilibrium constant expression and solving for x gives:

Kc = [HBr]^2 / ([H2] * [Br2])

2.180 × 10^6 = (0.278 + x)^2 / (2x * x)

Solving for x using this equation gives:

x = 0.390 M

Therefore, the equilibrium concentrations are:

[H2] = 0 - 2x = -0.780 M (Note: negative concentration is unphysical, but indicates that all H2 reacted)

[Br2] = 0 - x = -0.390 M (Note: negative concentration is unphysical, but indicates that all Br2 reacted)

[HBr] = 0.278 + x = 0.668 M

To know more about equilibrium, visit:

https://brainly.com/question/30694482

#SPJ1

Answer:

Explanation:

fats, proteins, and carbohydrates

The ion responsible for the solution being basic or acidic in NaC2H3O2 is the Acetate ion.

The Acetate ion, CH3COO- is responsible for the solution being acidic or basic in NaC2H3O2.

NaC2H3O2 is also known as Sodium Acetate. It is a common compound in the laboratory that is colorless, deliquescent, and odorless. It dissolves easily in water, and its pH varies depending on the solution's acetate and acetic acid concentration.

Because acetate ion is a weak base, its solution has a higher pH than a solution containing just the acid. The buffer capacity of a solution of the salt NaC2H3O2 (Acetate ion) is dependent on the concentration of the salt and the pH of the solution. A solution with a pH of 7.0 and a 0.1 M NaC2H3O2 concentration would have a buffer capacity of 1.4. A solution with a pH of 5.0 and the same salt concentration would have a buffer capacity of 13.0.The equation for the dissociation of sodium acetate is given below:

NaC2H3O2 ⇌ Na+ + C2H3O2-

We can say that the solution is basic if the pH is greater than 7, acidic if the pH is less than 7, and neutral if the pH is equal to 7.

Hence, the Acetate ion is responsible for the solution being basic or acidic in NaC2H3O2.

learn more about dissociation here

https://brainly.com/question/16818822

#SPJ11

Answer:

All of them have a nucleus..

Explanation:

Pretty simple stuff.  There's no cell without one.

Carlita’s body is made up of many cells. The one thing that all her cells have in common is they have the same kind of genes.

Genes are tiny pieces of spherical hereditary material that are bead-shaped and found on chromosomes. They hold the organism's genetic makeup. The number of genes on each chromosome is incalculable.

The hereditary material that makes up chromosomes is arranged in x shapes inside the nucleus. DNA, genes, and proteins make it up. An organism's genotype is distinct from other organisms because of its distinct genetic makeup, and this distinction can be passed down from one generation to the next.

Traits may be influenced by genes, the environment, or a mixture of the two. Quantitative features can also be qualitative, such as eye colour (such as height or blood pressure).

Therefore, numerous cells make up Carlita's body. Her cells all share the same type of genes, which is the only thing that unites them.

To learn more about genes, refer to the link:

https://brainly.com/question/8046559

#SPJ6

Answer: Sterilization

Explanation:

The pipette needs to be sterile so that nothing interferes with the DNA sample.