If 7.12 mol of ethane (C2H6) undergoes combustion according to the unbalanced equation
C2H6 + O2 −→ CO2 + H2O,
how many moles of O2 are required?

The freezing point of a solution made by mixing 56.5 grams of NaCl and 615.0 grams of water -5.84 °C.

The freezing point depression that occurs in water when mixing 56.5 grams of NaCl and 615.0 grams of water is determined using the freezing point depression formula as given below:

ΔTf = Kf * m * i

where;

ΔTf is the freezing point depression

Kf is a constant

m is the molality of the solution

i = constant

For the given solution;

Kf = 1.86

i = 2 (NaCl produces two ions)

Molality = moles of solute/mass of solvent in kg

Mass of solvent = 615.0 g or 0.615 kg

Moles of NaCl = mass / molar mass

Molar mass of NaCl = 58.5

Mass of NaCl = 56.5

Moles of NaCl = 56.5/58.5

Moles of NaCl = 0.966 moles

Molality = 0.966/0.615

Molality = 1.57 molal

ΔTf = 1.86 * 1.57 * 2

ΔTf = 5.84

The freezing point of solution = 0 - 5.84

The freezing point of solution = -5.84 °C

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Answer: B: a solvent

Explanation: I hope this helps!

Answer:

169.364 amu

Explanation:

Hey there!

To find the molecular weight, you have to first convert this into a chemical formula:

C5H8NO4Na

Now we have to find the mass for each of the elements and add them up to get our final answer

(12.06x5) + (1.008 x 8) + (14.01) + (16 x 4) + (22.99)

Adding all of it up we get:

169.364 amu

The activation energy (Ea) for this reaction is 34.7kJ when the rate constant for the decomposition of NO₂ is 0.750M⁻¹s⁻¹ at 598K and the rate constant at 751K is 19.7 M⁻¹s⁻¹.

Given the initial temperature (t1) = 598K

The first rate constant (k1) = 0. 750 M⁻¹s⁻¹

The final temperature (t2) = 751k

The second rate constant (k2) = 19.7 M⁻¹s⁻¹

Rate constants are related to temperature and activation energy by the Arrhenius equation as: ki = Ae^-(Ea/RTi) where A is the pre-exponential factor, R is the universal gas constant = 8.314472 J/mol.K, T is the temperature, Ea is the activation energy and K is rate constant. The activation energy for a given reaction is not affected by temperature.

So, k2/k1 = Ae^-(Ea/RT2)/Ae^-(Ea/RT1)

log(k2/k1) = -Ea/R[1/T2 - 1/T1]

log(19.7 / 0.750) = -Ea/8.314[1/751 - 1/598]

log(26.26) = -Ea/8.314[-0.00034]

1.419 x 8.314 = 0.00034Ea

Ea = 11.8/0.00034 = 34705.93 = 34.7kJ

Hence the required activation energy (Ea) is 34.7kJ

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The radiations that can emit electromagnetic energy with shorter wavelengths are these ones. Because metal surfaces reflect microwaves, Occurrences including refraction, diffraction, reflection, and interference have an impact on the transmission of microwaves.

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This conclusion that coastal California would be an excellent location to drill for oil is most likely based on:

D. Historical data revealing little or no chance of an oil spill.

The conclusion that coastal California will be ideal for oil drilling is based on the historical data that was examined by the analysts. This is a very good way of making environmental and business decisions.

If past data shows that a given trend or pattern is evident, then, intentional businesses should be able to base their findings on these.

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Noble gases are very less reactive. The correct is noble gases e) do not bond.

The noble gases are the very less reactive. The valence shell or the outer most shell are fully filled and this is the reason it can not share the electrons or gain the electrons to form the bond. The noble gas are belongs to the group 18 in the periodic table. The noble gases are : helium, neon, argon, krypton, xenon and the radon. They are non reactive gases and called as inert.

Thus, The noble gases don not form the chemical bond and they are very stable.

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Flask a contains molecules of oxygen and hydrogen which are gases while flask b contains molecules made up of both oxygen and hydrogen I.e water.

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The more stable secondary alkyl radical is easier to create, hence 2 chlorobutane is created quicker than 1 chlorobutane.

Chemical stability in chemistry refers to a chemical system's thermodynamic stability.

When a system is in its lowest energy state or in chemical equilibrium with its surroundings, thermodynamic stability occurs.

In this case, the primary alkyl halide is 1-chlorobutane, while the secondary halide is 2-chlorobutane.

As a result, the SN1 reaction will occur in the 2-chlorobutane more quickly than the 1-chlorobutane.

Since it is simpler to produce the more stable secondary alkyl radical, 2 chlorobutane is produced more quickly than 1 chlorobutane.

Thus, 2-chloro 2-methylbutane is more stable.

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The mole fraction, the partial pressure of SF6, the mole fraction of N2F2, the partial pressure of SF6, the partial pressure of N2F2, and the total pressure in the tank are all 0.62, 1.18, and 0.72 atm, respectively.

We must first determine how many moles of each gas are present in the tank in order to calculate their mole fraction and partial pressure. You can use the equation 8.5 / (8.5 + 5.2) = 0.62 if the tank is filled with 8.5 moles of sulfur hexafluoride gas and 5.2 moles of dinitrogen difluoride gas.

Nitrous oxide mole fraction is calculated as follows: (moles of N2F2) / (moles of total both gases) = 5.2 / (8.5 + 5.2) = 0.38.

The ideal gas law, PV = nRT, can be used to determine the tank's overall pressure. The total pressure in the tank can be calculated using the volume of the tank and the number of moles of each gas, assuming a constant temperature.

The formula below to determine the temperature and tank volume if the temperature is 25 degrees Celsius and the tank has a volume of 12 liters.

(Total Pressure) = (8.314 J/mol × K)(298 K) / (12L) (Total Moles).

Approximately is the total tank pressure.

Nine atmospheres.

Then: when considering SF6 partial pressure.

1.18 atm is equal to (0.62) × 1.9 atm.

N2F2 has the following partial pressure:

0.38 and 1.9 atm equals 72 atm.

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Subscript of [tex]H_2[/tex] is number indicating that [tex]H_2[/tex] contains two hydrogen atoms.

A subscript is a character that is printed slightly below and to the side of another character, commonly a letter or a number.

Chemists frequently employ subscripts in their formulations. When writing the chemical formula for water, H2O, a scientist would place the number 2 lower and smaller than the letters to either side of it.

To display the number of electrons in a specific sublevel, use superscripts.

Thus, the subscript of hydrogen represents the number of atoms.

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The pH of the solution prepared by dissolving 8.00 g of NaOH in 5.00 L of water is 12.598.

It is evident that from the given information, 8.00 g of NaOH (which is a strong base) has been dissolved in 5.00 L of water. So to calculate the pH of a solution we can use the formula:

m = n / M.                     Given :

n = 8.00 g / 40.00 g/mol = 0.200 mol

M = 40.00 g/mol

m = 0.200 mol / 5.00 L = 0.04 mol/L

By knowing  the concentration of hydroxide ions, we can use the relationship:

[OH-] = 10^(-14) / [H+]

pH = -log[H+]

The product of [H+] and [OH-] is always equal to 10^(-14) at 25 degree Celsius. Hence,

[H+] * [OH-] = 10^(-14)

[OH-] = 10^(-14) / [H+]

Substituting the value of [OH-] in the above equation.

pH = - log(10^(-14) / 0.04 ) =

pH = - log(2.5*10^(-13)) =

Therefore, the pH of the solution is 12.598.

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Mass may be calculated by multiplying density by volume if you already know the density and the volume.

How much substance is present in a material for each unit of volume is known as the density of an item. As a result, the following formula may be used to determine how an object's mass, m,  density, ρ, and volume, V are connected.

ρ = m/V

where  ρ=8.96 and V=30.5 and m=copper's mass

By entering these values into the equation above, we obtain

8.96 = m/30.5

Cross multiplying results in

m = 8.96x30.5

m = 273.28 g

Consequently, mass of copper is 273.28 g

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The half-life of carbon-12, the most common isotope of carbon, is approximately 5,730 years.

This means that after 5,730 years, half of the original amount of carbon-12 in a sample will have decayed into a stable isotope (nitrogen-14). Therefore, it would take approximately 11,460 years for three quarters of the original amount of carbon-12 in a sample to become stable. Importantly, carbon-12 is not radioactive and hence does not decay into a stable isotope, but it is used in carbon dating because it is a stable isotope of carbon. Dating depends on the decay of other isotopes, such as carbon-14 or radiocarbon.

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Answer: a. The electron configuration for sodium (atomic number 11) is:

1s² 2s² 2p⁶ 3s¹

b. The electron configuration for iodine (atomic number 53) is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹0 4p⁶ 5s² 4d¹0 5p⁵

c. The electron configuration for iron (atomic number 26) is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶

The number of moles of the oxygen that have been produced is 51.9 moles.

We know that we can be able to use the stoichiometry of the reaction to be able to obtain the reactants and the products of the reaction. In this case we have the decomposition of the aluminum oxide.

We know that;

Number of moles of the aluminum oxide = 34.6 moles

If 2 moles of the aluminum oxide produces 3 moles of oxygen

34.6 moles of the aluminum oxide would produce

34.6 * 3/2

= 51.9 moles

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A chemist wants to make the 5.0 moles of (NH₄)₃PO₄ in the formation of the reaction starting with the constituent elements. The moles of hydrogen gas are needed is 60 moles.

The chemical name of the compound is (NH₄)₃PO₄ is ammonium phosphate.

1 mole of (NH₄)₃PO₄ requires the 12 moles of the hydrogen

1 mole = 6.022 × 10²³ atoms / molecules , this is Avogadro's constant

1 mole of (NH₄)₃PO₄ =  12 moles of the hydrogen

5 moles of (NH₄)₃PO₄ = 5 × 12 moles of the hydrogen

5 moles of (NH₄)₃PO₄ = 60 moles of the hydrogen .

Thus, the moles of hydrogen is 60 moles.

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The number of moles of  C6H18O3 that can be formed is 2 and 264grams of CO2 can be formed from C6H18O3.

Given the substance C6H18O3

Mass of C6H18O3 available (m) = 22.73decagrams = 227.3g

Molar mass of C6H18O3 (M) = 131.28g/mol

We know that number of moles is taken as = mass of substance/Molar mass of that substance

So, number if moles of C6H18O3 = 227.3/138.21 = 1.72

From the reaction: C6H18O3 + 9O2 → 6CO2 + 9H2O

We can see that for every 1 mole of C6H18O3 6 moles of CO2 is formed.

So the mass of CO2(carbon dioxide) used is calculated as:

mass = moles of CO2 x Molar mass of CO2

Molar mass of CO2 = 44g/mol

mass of CO2 = 6 x 44 = 264g

Hence the required mass of CO2 is 264g

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The amount of AlCl3 that may be created from 22.0g of Al is shown by this equation.

22.0g Al multiplied by (1 mol Al/26.98g) by (2 mol AlCl3/2mol Al) by (133.34 g/1mol AlCl3) results in 108.66g AlCl3.

This equation illustrates the amount of AlCl3 that may be created from 27.0g of Cl2.

33.87g AlCl3 is obtained by multiplying 27.0g Cl2 by (1 mol Cl2/70.91g) x (2mol AlCl3/3 mol Cl2) x 133.34g.

This demonstrates that the limiting reactant is chlorine. The maximum amount of AlCl3 that can be created before the chlorine runs out is 33.87 grams.

The solution, using significant digits, is 33.8g of AlCl3.

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Answer:

Decanting can separate solid-liquid mixtures or mixtures of two immiscible liquids. 

Laboratory equipment is not needed to decant a mixture because one liquid is denser than the other liquid so they separate naturally

Explanation:

Decanting can separate solid-liquid mixtures or mixtures of two immiscible liquids. 

This is because decanting involves carefully pouring of a liquid from one container to another and as such, it can be used to separate immiscible liquids such as oil and water.

Answer:

The equilibrium constant for the reversible reaction N2(g) + 3H2(g) <---> 2NH3 at 400 degrees Celsius is given by K = [NH3]2/[N2][H2]3 = (0.0357)2/(0.0420)(0.516)3 = 0.000457.

The balanced equation states that for every 6 moles of HNO3 consumed, 2 moles of H2O are produced.

In this case, we are given that 96.00 moles of HNO3 are consumed in the reaction. To find the number of moles of H2O produced, we can use the stoichiometry of the balanced equation. We know that for every 6 moles of HNO3 consumed, 2 moles of H2O are produced. Therefore, we can use the proportion: 2 moles H2O/ 6 moles HNO3 = x moles H2O / 96.00 moles HNO3. Solving for x gives: x = (2 * 96.00) / 6 = 16 moles of H2O are produced when 96.00 moles of HNO3 are consumed. It's important to note that the balanced equation provides the stoichiometry of the reaction which helps us to calculate the number of moles of product produced from the given number of moles of reactant. The balanced equation also tells us that the reaction is stoichiometrically balanced and the number of moles of reactant and product are in a defined ratio.

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To prevent the buildup of difficult-to-remove residue, immediately wash glassware in hot water or a glassware washer after using it. If washing glassware right after after use isn't possible, Corning advises soaking it in water.

Scrub the interior of curved glassware with warm tap water and a brush dipped in soapy water. You can flush the sink with this waste water. To avoid severe water stains, remove soap suds with deionized water. Pouring the DI water rinse through clean glassware should result in a smooth sheet. deliver precise outcomes. Both a dirty lab and erroneous results are hazardous. Lab equipment, particularly glassware, needs to be cleaned after each usage. The outcomes of laboratory studies can be changed by leftovers from earlier experiments, dampness, or even dust particles.

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Based on the given information, B: Ethanol is the compound that has the strongest intermolecular forces.

Intermolecular forces (IMF) are the forces that hold molecules of a substance together. The strength of IMF is directly related to the boiling point of a substance. So, the stronger the IMF, the higher the boiling point will be.

The information provides the heat of vaporization (DHvap) for each substance, which is the energy required to convert a liquid into a gas. The higher the DHvap value, the stronger the IMF because more energy is required to overcome the forces that hold the molecules together.

When comparing the DHvap values, we can see that Ethanol (C2H5OH) has the highest DHvap value of 39.3 kJ/mol, followed by water (H2O) with 40.8 kJ/mol. This means that ethanol has stronger intermolecular forces than water, that's why ethanol has a higher boiling point than water.

Therefore, based on the DHvap values, Ethanol has the strongest intermolecular forces.

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Metals react with water and produce a metal oxide and hydrogen gas. Metal oxides that are soluble in water dissolve in it to further form metal hydroxide. When a metal and water react.

metal oxide and hydrogen gas are formed. The fundamental equation for the metal reaction with water is metal + water = metal oxide + hydrogen. Cold water swiftly reacts with the metals sodium, potassium, and calcium to generate hydroxides. In most cases, they react with water to generate bases or with acids to form salts. MO + H2O M(OH)2 (M = a group 2 metal) As a result, these compounds are frequently referred to as basic oxides. Magnesium oxide, for example, interacts with water to generate magnesium hydroxide, which turns red litmus blue, showing that it is a base. Magnesium oxide + Water Magnesium hydroxide is the chemical formula for this reaction.

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The time that the object was moving is 139.6 seconds.

To determine the time (t) that the object was moving, you can use the formula:

t = d

    v

where,

d = the distance the object travels

v = its velocity

d = 45.6 m

v = 0.327 m/s

Substituting the given values:

t = 45.6 m

    0.327 m/s

t = 139.6 seconds

Hence, the time that the object was moving is 139.6 seconds.

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Answer:

B. increase

Explanation:

the pressure will increase because there is more molecules inside the container

The result of the four trials by the student is precise to the actual weight of the lead block.

Since we have been alive for millions of years, we have acquired a sense of measurement, which is necessary for us to comprehend the outside world. Tools that provide scientists a number are necessary for measurements. The issue here is that every measurement, using any measuring device, has some level of uncertainty in the outcome. Error is the name given to this uncertainty. When taking measurements, accuracy and precision are two crucial considerations. These two phrases describe how closely a measurement resembles a value that is understood or accepted.

Accuracy refers to an instrument's capacity to measure exact values. It is, in other words, the degree to which the measured value resembles a standard or real value. Accuracy is possible by obtaining quick readings.

The precision of a substance is defined as the similarity between two or more measurements.

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2H5OH, also known as ethanol, is capable of forming hydrogen bonds. The ethanol molecule has a hydroxyl group (-OH) and a hydrogen atom on the carbon atom. The hydroxyl group can act as an electron donor and form hydrogen bonds with other electron-accepting groups such as nitrogen and oxygen atoms. The hydrogen atom can also act as an electron acceptor and form hydrogen bonds with electron-donating groups such as nitrogen and oxygen atoms.

In ethanol, the hydroxyl group is capable of forming one hydrogen bond with another molecule. In addition to that, the hydrogen atom on the carbon atom can form a hydrogen bond as well, So in total, C2H5OH can form 2 hydrogen bonds.

Neutralizing each mole of [tex]$\mathrm{H}_3 \mathrm{PO}_4$[/tex] will therefore, take three moles of NaOH.

Put the titration formula to use. The formula is molarity (M) of the acid x volume (V) of the acid = molarity (M) of the base x volume (V) of the base if the mole ratio between the titrant and analyte is 1:1. The number of moles of solute per litre of solution is how a solution's concentration, or molarity, is stated.

1M = 1 mol L

[tex]$34.55 \mathrm{~mL}=\frac{34.55}{1000}=0.03455 \mathrm{~L}$[/tex]

n = cV = 0.03455 × 1.500 = 0.05183 mol.

[tex]$\mathrm{H}_3 \mathrm{PO}_4$[/tex] exists inorganic. All three of its H atoms required to neutralized. It takes one [tex]$\mathrm{OH}^{-}$[/tex]to neutralize each H from [tex]$\mathrm{H}_3 \mathrm{PO}_4$[/tex]. Each formula unit of NaOH will provide one [tex]$\mathrm{OH}^{-}$[/tex]ion. Neutralizing each mole of [tex]$\mathrm{H}_3 \mathrm{PO}_4$[/tex] will therefore, take three moles of NaOH

[tex]$n(\mathrm{NaOH})=3 n\left(\mathrm{H}_3 \mathrm{PO}_4\right)=3 \times 0.05183=0.1555 \mathrm{~mol} \text {. }$$[/tex]

[tex]$V=\frac{n}{c}=\frac{0.1555}{1.420}=0.1095 \mathrm{~L}=0.1095 \times 10^3 \mathrm{~mL}=109.5 \mathrm{~mL} \text {. }$$[/tex]

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