Determine the enthalpy of combustion in kj/kg of fuel. the enthalpy of formation of naphthalene is 78.5 kj/g-mole. assume the water in the products is in liquid phase.

The conversion of 0.057km to m in the given question would be 57 m.

What do you mean by Conversion?

Conversion is the process of changing a substance from one form to another. A chemical reaction, for example, can change a solid into a liquid, a liquid into a gas, or a gas into a solid. Conversion can also refer to the process of transforming a substance from one chemical state or form to another, for example, from an element to a compound or from an acid to a base.

Step 1: Write down the given conversion.

Given: 0.057 km to m

Step 2: Determine the conversion factor.

1 km = 1000 m

Step 3: Set up the conversion so the desired unit is on top.

1000 m/1 km

Step 4: Multiply the conversion factor by the given quantity.

1000 m/1 km x 0.057 km = 0.057 x 1000 m

Step 5: Simplify the expression.

0.057 x 1000 m = 57 m

Hence, option C is correct.

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Correct question:

Convert 0.057km to m

a. 0.000057m

b. 0.57m

c. 57m

d. 570m

Answer:

A. it contains a lot of matter

Answer: they are both at the same concentration

Explanation: You will know that the amount of solvent in and around the cell will be equivalent when they have the same amount of concentration. The answer to the question is they are both at the same concentration.

Answer:

2.27%

Explanation:

The observed value of the boiling point = 71.8°C

The actual value of the boiling point = 70.2°C

We need to find the percentage error of the student's measurement. The percentage error in any value is given by :

\(\%=\dfrac{\text{calculated value-actual value}}{\text{actual value}}\times 100\\\\=\dfrac{71.8-70.2}{70.2}\times 100\\\\=2.27\%\)

So, the required percentage error is 2.27%.

Answer:

I belive it is PCl3

It's

( IUPAC NAME)

Phosphorus trichloride \( \bf \blue {\fbox{PCl_{3} }}\)

(other NAME)

Phosphorus (lll) chloride

Answer: A central nervous system stimulant

Explanation: arguably the most frequently ingested pharmacologically active substance in the world.

Answer:

2 and 3 only

Explanation:

The formular for the compound; Silicon(IV)oxide is SO2

1. Silicon atoms form four single bonds in silicon(IV) oxide.

This statement is wrong because the silicon is doubly bonded to two oxygen atoms.

2. Oxygen atoms form two double bonds in silicon(IV) oxide.

This statement is correct.

3. Silicon(IV) oxide has a high melting point.

This statement is correct Due to it's macromolecular structure, it is able to form thousands of covalent bonds between it's sulphur and oxygen sub units.

4. Silicon(IV) oxide contains one silicon atom and four oxygen atoms.

This statement is wrong as silicon(iv) oxide contains only two oxygen atoms.

Answer: the atomic size will decrease

Explanation:

Answer:

It will remain the same because it is moving up and down to and fro it can not increase nor decrease or else will become an ion

Answer:

solute, im pretty sure

Explanation:

No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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Answer:

decreases

Explanation:

As you go down the same group on the periodic table, the electronegativity of an atom will decrease.

Answer:

inhibits glycolysis

Explanation:

In a specimen collected for plasma glucose analysis, sodium fluoride is commonly used as a preservative and inhibitor of glycolysis.

Sodium fluoride prevents the breakdown of glucose in the sample, thereby stabilizing the glucose concentration and preventing falsely low results. This is particularly important for samples that will be analyzed for glucose over a period of time. By inhibiting glycolysis, sodium fluoride can help ensure accurate and reliable glucose measurements in clinical settings.

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Answer:

400 joules sisisiss

Explanation:

Answer:

A) 12 mol H2O.

Explanation:

Hello,

In this case, for the given reaction:

\(2C_2H_6+7O_2\rightarrow 4CO_2 + 6 H_2O\)

We notice that oxygen is in a 7:6 molar relationship with water, for that reason, the resulting moles of water turn out:

\(n_{H_2O}=14molO_2*\frac{6molH_2O}{7molO_2} \\\\n_{H_2O}=12molH_2O\)

Thus, the answer is A) 12 mol H2O.

Best regards.

Answer:

Polybutene exists in two isomeric forms depending on where the carbon double bond is positioned in the monomer molecule. If it is between the first and second carbon atoms in a linear molecule, then the chemically accurate name of the resulting polymer is polybutene-1.

Answer:

closely related

Explanation:

Answer: Option C

A measurement of speed equaling (27.7 km/hour)

Explanation:

It is measurement of speed equaling (27.7 km/hour) because it is a factor used in dimensional analysis because it is a problem solving method that involve the use of number or expression which can be multiplied without affecting or causing a change in the value of the expression.

27.7km/he is not the exact number that can limit the precision of the calculated value or accurate value.

Answer:

I believe the correct answer is c but I'm not a 100% positive

Answer:

It's: Speed!

Explanation:

Answer:

okay your question in science

The correct answer is b. Only at low pH can short-chain organic acids penetrate the microbial cell membrane. These acids have antimicrobial properties and can inhibit the growth of harmful bacteria in food.

When the pH is higher than 5.5, the acids become ionized and lose their ability to penetrate the cell membrane, making them less effective as preservatives. Microorganisms play a role in pathogenesis, food production, food spoilage, nutrition cycling, decomposition, industrial production, and even the creation of potential fuel sources.

When studying microbiology, keep in mind that most microbes do not cause disease in humans. Microbes can also serve important purposes. While some microorganisms contribute to food spoilage, others are used in the production of food products or to improve flavouring.

Microbial development is aided by moisture, a pH that is neutral or slightly acidic, and a high protein level in meals.

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Answer

To convert μg/l to mol/kg?

Step 1: from the mass in grams, find the number of moles by diving the mass by its molar mass

Step 2: To go from L to kg, take the volume given multiply it by density in kg/L

Covalent radius refers to covalently bonded atoms while atomic radius refers to non-bonded atoms.

There are two terms that are easily confused for each other in chemistry, these are the covalent radius and atomic radius. Covalent radius refers to covalently bonded atoms while atomic radius refers to non-bonded atoms.

Hence, half the distance between the nuclei of two covalently bonded atoms is the covalent radius, whereas half the shortest distance between the nuclei of identical nonbonded atoms is the atomic radius.

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Answer:

Option D. fluorine-18

Explanation:

The attached photo gives the explanation.

In the attached photo, A zX represent the atom that will undergo beta decay to produce oxygen–18.

After the calculation, A zX was found to be fluorine–18.

Adding CH4 to the exothermic reversible reaction at equilibrium will cause the reaction to shift to the left, favoring the formation of C(s) and 2H2(g).

To understand how adding CH4 will affect the equilibrium, we can use Le Chatelier's Principle, which states that if a change is made to a system at equilibrium, the system will adjust itself to counteract that change and restore the equilibrium.

The reaction is represented as:

C(s) + 2H2(g) ⇌ CH4(g)

In this case, the change is an increase in the concentration of CH4. According to Le Chatelier's Principle, the equilibrium will shift in the direction that decreases the concentration of CH4. In this reaction, that means the equilibrium will shift to the left, favoring the formation of the reactants C(s) and 2H2(g). This will continue until a new equilibrium is established.

So, the exothermic reversible reaction that is at equilibrium will move to the left when CH4 is added, favoring the synthesis of C(s) and 2H2(g).

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Given,TiCl4 + 2H2O → TiO2 + 4HClMolar mass of TiCl4 = 189.6 g/mol. Molar mass of TiO2 = 79.9 g/molNow, the balanced chemical equation is;TiCl4 + 2H2O → TiO2 + 4HClNow, for producing 1 mol of TiO2, 1 mol of TiCl4 is required.

Also, the molar mass of TiO2 is 79.9 g/mol.Moles of TiO2 = Given mass/Molar mass = 50/79.9 = 0.625 molMoles of TiCl4 required = Moles of TiO2 = 0.625 molNow, the percentage yield is given as 78.9%.Therefore,Actual yield = 78.9/100 × Theoretical yield.

Theoretical yield = Moles of TiCl4 × Molar mass of TiCl4 = 0.625 × 189.6 = 118.5 g. Actual yield = 78.9/100 × 118.5 g = 93.48 gTherefore, the mass of TiCl4 required to produce 50.0 g of TiO2 with 78.9% yield is 118.5 g (Theoretical yield) and 93.48 g (Actual yield).

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The energy levels in which electrons orbit around the nucleus are also called electron shells.

All atoms contain electrons, protons and neutrons. The protons and neutrons are located in the center of the atom called the nucleus. Electrons orbit around the nucleus in electron orbits or shells.

Electron shells or energy levels are the paths followed by electrons as they orbit round the nucleus. The shells are used to determine an atom's electronic configuration and atomic structure.

The shells in an atom are given a number, starting from the innermost shell to the outermost shell, called the principal quantum number, denoted with the letter n. The farther away a shell is from the nucleus, the higher the energy level and the higher the principal quantum number.

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Answer:

0.206 mol H₂O₂

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

7.00 moles H₂O₂

Step 2: Identify Conversions

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O₂ - 2(1.01) + 2(16.00) = 34.02 g/mol

Step 3: Convert

\(7.00 \ g \ H_2O_2(\frac{1 \ mol \ H_2O_2}{34.02 \ g \ H_2O_2} )\) = 0.205761 mol H₂O₂

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

0.205761 mol H₂O₂ ≈ 0.206 mol H₂O₂

Answer:

238.14

Explanation:

2 H + 2O

2(1.01) + 2(16.00) = 34.02

34.02*7 = 238.14

238.14

Answer: 0.5 M

Explanation: