The combustion of butane in oxygen is represented in a equation below
2C4H10(g) +13O2 >16H20 + 8CO2(g)
(I) calculate the volume of oxygen at STP needed to burn 50cm³ of the butane.
(ii) what would be the volume of the oxygen if it is measured at 15°c and 289mmhg pressure ​

If the diameter of an atom is 1 × 10⁻⁸ cm, the diameter of the nucleus is approximately 1 × 10⁻¹² cm, since the atom is mostly empty space.

The nucleus is the part of an atom that contains more than 99.9% of its mass, represented by protons and neutrons.

The diameter of an atom is 1 × 10⁻⁸ cm. The nucleus is about 10,000 times smaller than the atom. Thus, the diameter of the nucleus is:

d(nucleus) = d(atom) / 10,000

d(nucleus) = 1 × 10⁻⁸ cm / 10,000 = 1 × 10⁻¹² cm

If the diameter of an atom is 1 × 10⁻⁸ cm, the diameter of the nucleus is approximately 1 × 10⁻¹² cm, since the atom is mostly empty space.

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Answer: A conclusion is the end of a statement or story that is highly descriptive to sum up the statement or story.

The following works best as the reaction steps to carry out the conversion below CH2-CHO CH-CH2 is  (1) B2H/diglyme (2) H2O2, NaOH (3) PCC/CH2Cl2.

Alcohol is produced via the hydroboration reaction of alkene according to the anti-rule. Markovnikov's Secondary alcohols are converted to ketones and primary alcohols to aldehydes by PCC (Pyridinium Chlorochromate).When Markovnikov is added to alcohol, other reagents cause it to be further oxidized into a ketone.Diglyme, also known as bis (2-methoxyethyl) ether, is a linear aliphatic diether that is frequently employed as a solvent and exists as a transparent liquid with a slight ether odor at room temperature. There is no evidence that the chemical exists in nature. In the presence of either basic or acidic catalysts, it is created from ethylene oxide and methanol.

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You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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A liquid substance that could be used in the laboratory for dissolving dry mortar on floor tiles is vinegar; (i) removing KMnO₄, stains is sodium metabisulfite solution; drying acid anhydrides is concentrated sulfuric acid.

Solvents are substances usually liquids, but may also be gases or solids that dissolve other substances known as solutes.

Solvents are usually used as cleansing agents.

One possible liquid substance that could be used for dissolving dry mortar on floor tiles is a mild acid solution, such as diluted hydrochloric acid or vinegar.

KMnO₄ stains are often difficult to remove, but one substance that can be used is sodium metabisulfite (Na₂S₂O₅) solution. Sodium metabisulfite acts as a reducing agent and can effectively neutralize and remove KMnO₄ stains.

Concentrated sulfuric acid is commonly used in the laboratory as a drying agent. It has a strong affinity for water and can efficiently absorb moisture, including water present in acid anhydrides.

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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 reaction rate to the nearest whole number is 36.1 mg/l/sec.

To calculate the reaction rate we would use the formula already provided which is: mass of tablet/volume of water ÷ Reaction time.

For the tablet with a 3°C Reaction time, we would calculate the rate as follows:

1000 mg * 0.2L/138.5 sec = 36.1 mg/L/sec.

The final result has all three variables and the resulting answer is the reaction rate.

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Complete Question:

Assume that each tablet's mass was 1,000 mg, and remember that you used 0,200 L of water each time,

Compute the reaction rate to the nearest whole number using the formula below,

mass of tablet/volume of water

Reaction Rate = mass reaction time

3°C Reaction time = 138.5 sec

Reaction rate = mg/l/sec

Answer:

Around 450 B.C.

Explanation:

The idea was forgotten until the 1800 when John Dalton re-introduced the atom.

Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

Answer:

Cl (Chlorine) has higher electron affinity or electron gain enthalpy as compared to F(Fluorine) as though F is most electronegative in the whole periodic table and so has the highest tendency to attract electrons

Explanation:

Answer:

it depends on the drink

Explanation:

it can depends on the nutritional facts, ingredients used, the time the drink was made and so on and really change the effects still depending on the drink

Sports drinks are flavored beverages often containing carbohydrates, minerals and electrolytes (salts), and sometimes vitamins or other nutrients. On the other hand, energy drinks typically contain stimulants such as caffeine and guarana with varying amounts of sugar protein, vitamins, sodium and other minerals.

Answer: 1and 4

Explanation: iron is an element not an alloy. An ionic lattice is not bonded covalently.

Answer: EXTINCTION

Explanation:

Answer:

extinction

Explanation:

The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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The equipment necessary while extending the connection is IDF.

MDF is Main distribution frame. It is the central point where all the incoming network cables from the service provider are terminated. From here the network connections are distributed to different parts of the building. MDF is usually located in the main equipment room or data center.

IDF is Intermediate distribution Frame . These are the distribution points located closer to the end users , which connect the MDF to various network switches and routers located in different parts of the building.

Dermac point: This is the point where the service provider's networks terminate, and the customer's network begins. It is used to demarcate responsibility for network maintenance.

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Answer:

when they have eight valence electrons.

Explanation:

When atoms do not have a full valence shell, the atoms are more likely to react with other and vice versa.

Answer:

When they have a full shell of electrons

Explanation:

and or eight valence electrons

The pH of a 0.053 M solution of ammonium bromide at 25° C is equal to 33.9.

Acids are a substance that has a pH lower than 7 and bases are a substance that has a pH of more than 7.

the pH of any solution will be calculated as:

pH = -log[H⁺]

Given the chemical reaction in equilibrium with ICE table will be:

                         NH₄⁺  +  H₂O  ⇌  NH₃  +  H₃O⁺

Initial:                 0.289                       0          0

Change:                 -x                         +x        +x            

Equilibrium:      0.289-x                      x           x

Equation for Kb for this reaction is:

Kb = [NH₃][H₃O⁺] / [NH₄⁺]

Given value of Kb = 1.8 × 10⁻⁵

On putting values equation becomes

1.8 × 10⁻⁵ = x² / 0.053 - x

The value of x is negligible as compared to 0.053 so the equation becomes

1.8 × 10⁻⁵ = x² / 0.053

x = 2.28 × 10⁻³

i.e. [NH₃] = [H₃O⁺] =  33.9 × 10⁻³

Calculating the pH by putting this concentration value on the equation

pH = -log(33.9 × 10⁻³)

pH = 33.9

Thus, the pH will be 33.9.

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Answer:

hey what up

Explanation:

Answer:

september i think

Explanation:

Answer:

March for the last four years is the month with the highest number of new monthly listings. After March the number of new monthly listings generally goes down then goes up in again October. After October the number of new listings go straight down forming the bottom of the V. Which Months May Have the Highest and the Lowest Median Sale Price?

Explanation:

Answer:

e

Explanation:

Provided the reaction that leads to the formation of the products can proceed in both forward and backward directions, the correct answer would be yes because the reaction will proceed backward until equilibrium is reached.

For a reaction that can proceed both forward and backward, the addition of a catalyst increases the rate of reaction in both directions based on the fact that a catalyst cannot alter the equilibrium of a reaction.

Hence, if an enzyme is added to the product of a reaction that has the potential to proceed in both forward and reverse reactions, a substrate would be expected to form because the reaction will proceed backward until an equilibrium is reached.

The correct option is e.

Answer:

Circulatory

Explanation:

If you take several measurements, then your data will be precise if the measurements are consistently close to each other.

Precision is a measure of the reproducibility of a set of measurements. If a set of measurements is precise, it means that the measurements are similar to each other and give a reliable indication of the true value of the quantity being measured. On the other hand, if the measurements are widely spread out and inconsistent, they are considered imprecise.

Thus, to ensure precision in measurements, it's important to use accurate instruments, take multiple measurements, and use statistical methods to analyze the data and identify any outliers or errors. It's also important to follow standard procedures and protocols for making measurements to minimize any sources of variability.

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The molecular weight of unknown gas : 23.46 g/mol

Given

A vessel contains 10% of oxygen and 90% of an unknown gas.

diffuses rate of mixed gas = 86 s

diffuses rate of O₂ = 75 s

Required

the molecular weight of unknown gas (M)

Solution

The molecular weight of mixed gas :(M O₂=32 g/mol)

\(\tt 0.1\times 32+0.9\times M=3.2+0.9M\)

Graham's Law :

\(\tt \dfrac{r_{O_2}}{r_{mixed~gas}}=\sqrt{\dfrac{M_{mixed}}{M_{O_2}} }\\\\\dfrac{75}{86}=\sqrt{\dfrac{3.2+0.9M}{32} }\\\\0.76=\dfrac{3.2+0.9M}{32}\\\\24.32=3.2+0.9M\\\\21.12=0.9M\rightarrow M=23.46~g/mol\)

The standard deviation of ksp is 2.646 x 10⁻⁶ and the relative standard deviation kf ksp (%RSD) is 27.56%.

To calculate standard deviation of Ksp, first, find the deviations of each trial's Ksp value from the average Ksp value:

Trial 1 = (10 x 10⁻⁵) - (9.6 x 10⁻⁶) = 9.04 x 10⁻⁶

Trial 2 = (8.0 x 10⁻⁵) - (9.6 x 10⁻⁶) = 7.04 x 10⁻⁵

Trial 3 = (11 x 10⁻⁵) - (9.6 x 10⁻⁶) = 1.04 x 10⁻⁴

Square each deviation and find the average:

(9.04 x 10⁻⁶)² + (7.04 x 10⁻⁵)² + (1.04 x 10⁻⁴)² = 2.098 x 10⁻¹⁰

Average = 2.098 x 10⁻¹⁰ / 3 = 6.993 x 10⁻¹¹

Finally, take the square root of the average to get the standard deviation of Ksp:

Standard deviation of Ksp = √(6.993 x 10⁻¹¹) = 2.646 x 10⁻⁶

To calculate the relative standard deviation of Ksp (%RSD):

%RSD = (standard deviation / average) x 100%

%RSD = (2.646 x 10⁻⁶ / 9.6 x 10⁻⁶) x 100% = 27.56% (rounded to two decimal places)

Therefore, the standard deviation of Ksp is 2.646 x 10⁻⁶ and the relative standard deviation of Ksp (%RSD) is 27.56%.

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Answer:

24.5872 meters per second

Rouned 24.6 or 25

Answer:

Explanation:

We can use the formula:

q = mcΔT

where q is the heat absorbed, m is the mass, c is the specific heat, and ΔT is the change in temperature.

Given:
specific heat of iron (c) = 0.449 J/g°C
initial temperature (T1) = 24.0°C
final temperature (T2) = 82.1°C
heat absorbed (q) = 948.0 J

Substituting the given values into the formula, we get:

q = mcΔT
948.0 J = m(0.449 J/g°C)(82.1°C - 24.0°C)
948.0 J = m(0.449 J/g°C)(58.1°C)
m = 948.0 J ÷ (0.449 J/g°C × 58.1°C)
m = 33.1 g

Therefore, the mass of the iron piece is 33.1 g (to three significant figures)

Answer:Cellular respiration is not the same as breathing, but they are closely related

Explanation: When you breathe in, you take in the oxygen your cells need for cellular respiration. When you breathe out, you get rid of carbon dioxide that your cells produce during cellular respiration.

Answer:

for the definition type cooking

Explanation:

7

Answer:

The concentration is 2.277

Explanation:

The formula for finding the concentration of a solution is C= mole of solute divided by the volume of the solution

Therefore, C= 2.05/0.900

C=2.277