A tank contains 33.6 L of helium gas at STP. how many moles of HE gas are in the tank?

0.128 moles of O2 were collected.

The purpose of collecting the oxygen over water is to prevent any other gas from entering the collection vessel. The water acts as a barrier to keep out other gases.

To determine the moles of O2 collected, we need to correct for the presence of water vapor in the sample. At 25.00°C, the vapor pressure of water is 23.76 mmHg or 0.0313 atm.

First, we can calculate the partial pressure of oxygen:

P(O2) = total pressure - vapor pressure of water

P(O2) = 0.886 atm - 0.0313 atm

P(O2) = 0.8547 atm

Next, we can use the ideal gas law to calculate the moles of O2:

n = PV/RT

where P is the partial pressure of O2, V is the volume of the sample, R is the gas constant (0.08206 L·atm/(mol·K)), and T is the temperature in Kelvin (25.00°C + 273.15 = 298.15 K).

n = (0.8547 atm)(2.92 L)/(0.08206 L·atm/(mol·K))(298.15 K)

n = 0.107 mol

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Answer:

The balanced chemical equation for the reaction between butanoic acid and ethanol to produce ethyl butyrate is:

CH3CH2CH2COOH + C2H5OH → CH3CH2CH2COOC2H5 + H2O

From the equation, we can see that 1 mole of butanoic acid reacts with 1 mole of ethanol to produce 1 mole of ethyl butyrate and 1 mole of water. The molar mass of butanoic acid is 88.11 g/mol and the molar mass of ethyl butyrate is 116.16 g/mol.

To find out how many grams of ethyl butyrate can be produced from 8.55 g of butanoic acid, we first need to determine how many moles of butanoic acid are present:

moles of butanoic acid = mass / molar mass = 8.55 g / 88.11 g/mol = 0.097 mol

Since the reaction has a yield of 78.0%, we can calculate the theoretical yield of ethyl butyrate as follows:

theoretical yield = moles of butanoic acid × (1 mol ethyl butyrate / 1 mol butanoic acid) × 78.0%

= 0.097 mol × 1 × 0.78

= 0.0757 mol

Finally, we can calculate the actual mass of ethyl butyrate produced using its molar mass:

mass of ethyl butyrate = moles of ethyl butyrate × molar mass

= 0.0757 mol × 116.16 g/mol

= 8.80 g

Therefore, from 8.55 g of butanoic acid and excess ethanol, the chemist can produce 8.80 g of ethyl butyrate with the more efficient catalyst.

Answer:

First, let's find the moles of NaOH:

moles NaOH = Molarity x Volume (L)

moles NaOH = 0.700 mol/L x 0.01100 L

moles NaOH = 0.00770 mol

Next, let's find the moles of HCl:

moles HCl = Molarity x Volume (L)

moles HCl = 0.200 mol/L x 0.00100 L

moles HCl = 0.00020 mol

Since NaOH and HCl react in a 1:1 ratio, we can see that all of the HCl will react with the NaOH and none will be left over. This means that the concentration of NaOH in the final solution is:

0.00770 mol / (0.01100 L + 0.05000 L) = 0.1027 M

Now we can find the pOH of the solution:

pOH = -log[OH-]

pOH = -log(0.1027)

pOH = 0.990

And finally, we can find the pH of the solution:

pH + pOH = 14

pH = 14 - 0.990

pH = 13.01

Therefore, the pH of the resulting solution is 13.01.

Answer:

To calculate the number of grams in 1.75 moles of CO2, we need to use the molar mass of CO2, which is 44.01 g/mol.

The calculation is:

1.75 mol CO2 x 44.01 g/mol = 77.0175 g CO2

Therefore, there are 77.0175 grams of CO2 in 1.75 moles of CO2.

Explanation:

Answer:

The bond order between carbon and oxygen in carbon dioxide (CO2) is two.

The Lewis structure of CO2 shows that each of the two double bonds (C=O) consists of one sigma bond and one pi bond. The bond order is the number of electron pairs being shared by a pair of atoms in a molecule, divided by the number of chemical bonds between the same pair of atoms. In CO2, there are two double bonds between carbon and oxygen, and each double bond has a bond order of 2. Therefore, the overall bond order between carbon and oxygen in CO2 is 2.

A base is a proton acceptor according to the Brnsted-Lowry classification of acids and bases, whereas an acid is a proton (H+) donor. A Brnsted-Lowry acid drops a proton, creating a conjugate base.

Any hydrogen-containing substance that has the ability to donate a proton (hydrogen particle) to another substance is considered an acid. A base is a molecule or particle that can take on an acid's hydrogen ion.

A Bronsted-Lowry base is a compound that can receive a hydrogen ion, whereas a Bronsted-Lowry acid can donate one. A substance that can give two electrons is known as a Lewis base.

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According to the trends method of forecasting, the snowstorm will arrive in about 4 hours with speed of 35 miles/hr. The correct answer is option A.

We can use the formula:

Time = Distance / Speed

to calculate the time it will take for the snowstorm to reach your town.

The distance between the snowstorm and your town is 140 miles, and it is moving at a speed of 35 miles per hour.

Time = 140 miles / 35 miles per hour

Time = 4 hours

The solution provided above uses the formula:

Time = Distance / Speed

This formula relates the time it takes for an object to travel a certain distance to the speed at which it is traveling. In this case, the object is the snowstorm, the distance is the distance between the snowstorm and your town (140 miles), and the speed is the speed at which the snowstorm is moving (35 miles per hour).

When we divide the distance (140 miles) by the speed (35 miles per hour), we get a result of 4 hours. This means that it will take the snowstorm 4 hours to travel the distance of 140 miles and reach your town. The trends method of forecasting assumes that the speed and direction of the snowstorm will remain constant, and therefore we can use this formula to estimate the time it will take for the snowstorm to arrive. It is important to note that this method is based on the assumption that the speed and direction of the snowstorm will not change, and therefore may not be accurate in all situations. Additionally, weather forecasting is a complex process that involves many factors, and the trends method is just one of many methods used to forecast weather.

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Answer:

In sphingolipids, the hydrophobic region consists of a longchain sphingoid base with generally 18 carbons, such as sphingosine, which is linked to the acyl group of a fatty acid via an amide bond (R2). The hydrophilic region (R1) consists in the simplest case of a hydroxyl group in the case of ceramide.

Explanation:

Cobalt weighs 58.93 g/mol, or 1 mole. Hence, the sample of cobalt weighs 4. 89 10 2 grammes.

Basic Details. The price of US cobalt is currently 48874.36, down from 51497.77 last month and 70527.05 last year. The difference from the previous month and one year ago is -5.09% and -30.70%, respectively.

In addition, cobalt is used to create ground coats for porcelain enamels, cemented carbides (also known as hardmetals), diamond tools, corrosion- and wear-resistant alloys, airbags for automobiles, catalysts for the petroleum and chemical industries, drying agents for paints, varnishes, and inks, dyes, and pigments.

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Answer:

Lockout/Tagout direct wired equipment at energy source

Explanation:

The purpose of Lockout Tagout (often referred to as LOTO) is to keep the affected employees in the area from any active energy sources on a machine. The best way to isolate hazardous energy is to isolate it at the energy source to dissipate all hazardous energy that could harm an affected employee.

Answer:

To determine the moles of potassium chloride required to completely precipitate all of the silver, we first need to write a balanced chemical equation for the reaction between silver and potassium chloride. The balanced chemical equation is:

AgNO3 + KCl → AgCl + KNO3

This equation shows that 1 mole of AgNO3 reacts with 1 mole of KCl to produce 1 mole of AgCl.

Next, we can calculate the moles of silver in the solution using its molar mass:

moles of Ag = mass / molar mass

moles of Ag = 3.08 g / 107.87 g/mol

moles of Ag = 0.0286 mol

Since the reaction between silver and potassium chloride is 1:1, we need the same number of moles of KCl as the number of moles of Ag:

moles of KCl = 0.0286 mol

Finally, to determine the mass of KCl required, we can use its molar mass:

mass of KCl = moles of KCl x molar mass

mass of KCl = 0.0286 mol x 74.55 g/mol

mass of KCl = 2.13 g

Therefore, we need to add 0.0286 moles of KCl (equivalent to 2.13 g) to completely precipitate all of the silver.

The sample of iodized salt contains 0.9105 g of KCI, which is a mixture of NaCl and KCI with a KCI content of 60.7%.

KCI makes up 60.7% of the sample's total mass, and NaCl makes up the remaining portion (100% - 60.7%) of the sample's mass.

Firstly, let's determine the mass of NaCl in the sample:

NaCl mass is equal to (0.5935 g) (100% - 60.7%)*1.50 g.

We can now determine the mass of KCI:

KCI mass equals 60.7% * 1.50 g = 0.9105 g

KCI thus has a mass of 0.9105 g in the iodized salt sample.

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Replacement is the reaction that occurs when one atoms swaps places with another in a compound or when two components in two separate compounds switch places.

Breaking chemical bonds between reactant molecules (particles) and creating new bonds between atoms in product particles are two aspects of chemical reactions (molecules). While there are the same number of atoms both before and after the chemical transition, there will be a change in the number of molecules.

When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

When two atoms collide to create a heavier atom, such as when two hydrogen atoms combine to create one helium atom, this process is known as fusion. The sun is powered by a similar mechanism that generates enormous amounts of energy that are many times bigger than those produced by fission.

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Answer:

The molar mass of aspirin (C9H8O4) can be calculated as follows:

1 mol C = 12.01 g

9 mol C = 9 x 12.01 g = 108.09 g

8 mol H = 8 x 1.01 g = 8.08 g

4 mol O = 4 x 16.00 g = 64.00 g

Total molar mass of aspirin = 180.17 g/mol

To determine the number of aspirin molecules in 200 mg of aspirin, we first need to convert the mass of aspirin to moles:

200 mg aspirin x (1 g / 1000 mg) x (1 mol / 180.17 g) = 0.001110 moles aspirin

Next, we use Avogadro's number to convert moles of aspirin to molecules:

0.001110 moles aspirin x 6.022 x 10^23 molecules/mol = 6.68 x 10^20 aspirin molecules

Therefore, there are approximately 6.68 x 10^20 aspirin molecules in 200 mg of aspirin.

Answer:(−NH−CHR−CO−)n is a homopolymer. The reason is that it has a single monomer (NH2−CHR−COOH), α−amino acid.

If a polymer consists of only one kind of monomer then it is called a homopolymer, while a polymer that consists of more than one kind of monomer is called a copolymer

The solvent in a marking pen is water, and the solutes are the pigments and dyes that provide the color.

In a solution, the solvent is the substance that dissolves the solute. It is the component that is present in the greatest amount and provides the medium for the solute to be dissolved in.

In the case of a marking pen, the solvent is water. Water is a common solvent because it has a high polarity, which means it can dissolve many substances that have polar or ionic bonds.

The solutes in a marking pen are the pigments and dyes that provide the color. These are substances that are insoluble in water but are suspended in the water-based solution in the pen.

The pigments and dyes are dissolved in the water to create a homogeneous solution that can be used for writing and marking on surfaces.

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The concentration of phosphoric acid is 1.11 M.

Phosphoric acid is a colorless, odorless phosphorus-containing solid, and inorganic compound with the chemical formula H₃PO₄.

To determine the concentration of the phosphoric acid (H3PO4) in this reaction, we can start by using the balanced chemical equation:

H3PO4 + 3 NaOH → Na3PO4 + 3 H2O

From the equation, we can see that 1 mole of H3PO4 reacts with 3 moles of NaOH. Therefore, we can first calculate the number of moles of NaOH in the reaction:

Since the reaction is a 1:1 ratio between H3PO4 and NaOH, the number of moles of H3PO4 is also 0.040 mol.

Next, we can calculate the concentration of H3PO4:

concentration of H3PO4 = moles of H3PO4 / volume of H3PO4

volume of H3PO4 = 36.0 mL = 0.036 L

concentration of H3PO4 = 0.040 mol / 0.036 L

concentration of H3PO4 = 1.11 M

Therefore, the concentration of phosphoric acid is 1.11 M.

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Answer:

A:16

Explanation:

it's one of those things where there is no way to explain it but I hope this helps

c

first balance the chemical equation / the equation is already balanced/

secondly write the given mole above the compound

then place the coefficient as a number of mole under the compound

after that set up the proportion

finally calculate the unknown mole

x/16 = 10/5

x=32

The temperature of sample gas that fills a 0.725L container is 576K which initially is collected in a 0.4L container at a temperature of 318K.

Given the volume of a sample gas (V1) = 0.4L

The temperature of gas (T1) = 45°C = 273 + 45 = 318K

The volume of container that fills gas (V2) = 0.725L

The temperature of gas at volume V2 = T2

We know that from ideal gas laws, the volume of gas and temperature are directly related to each other where its equation is: PV = nRT

If we assume the pressure is constant, then,

From the above equation we can say that:

V1/T1 = V2/T2

0.4/318 = 0.725/T2

T2 = 576.315K

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In order to satisfy the Law of Conservation of Mass, 64.7 grammes of items must be produced.

The following diagram illustrates the balanced chemical equation for propane combustion: C 3 H 8 ( g ) ( g ) Propane plus O2O ( g ) CO2 3 Oxygen ( g ) Carbon dioxide + 4 hydrogen ions ( l ) Heat plus water.

We must create a balanced chemical equation for propane combustion in order to resolve this issue:

C3H8 + 5O2 → 3CO2 + 4H2O

We must figure out how many moles of oxygen and propane are used in the reaction.

moles of propane = 14.0 g / 44.1 g/mol = 0.317 mol

moles of oxygen = 102.0 g / 32.0 g/mol = 3.1875 mol

moles of oxygen used = 0.317 mol x 5 = 1.585 mol

moles of oxygen left over = 3.1875 mol - 1.585 mol = 1.6025 mol

we can use the mole ratios in the balanced equation to determine the moles of products formed:

moles of carbon dioxide = 3 x 0.317 mol = 0.951 mol

moles of water = 4 x 0.317 mol = 1.268 mol

Now we can calculate the total mass of the products:

mass of carbon dioxide = 0.951 mol x 44.01 g/mol = 41.8 g

mass of water = 1.268 mol x 18.02 g/mol = 22.9 g

Total mass of products = mass of carbon dioxide + mass of water

= 41.8 g + 22.9 g

= 64.7 g

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The pressure in the flask if it proceeds to completion would be given as 2.5 atm

Using Dalton's partial pressure law, this states that Dalton's law of partial pressures states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each component gas. In other words, in a mixture of gases, the pressure contributed by each gas is independent of the pressure of the other gases present.

Mathematically, Dalton's law can be expressed as follows:

P_total = P_A + P_B + ... + P_n

hence we would have

1.5 atm + 1.0 atm

= 2.5 atm

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Answer:

1.6 g/L

Explanation:

To calculate the concentration of ibuprofen in a bottle of Motrin, we need to divide the amount of ibuprofen (in grams) by the volume of the bottle (in liters).

First, we need to convert the volume of the bottle from milliliters (mL) to liters (L):

500 mL = 0.5 L

Now we can calculate the concentration:

Concentration = Amount of ibuprofen / Volume of bottle

Concentration = 0.8 g / 0.5 L

Concentration = 1.6 g/L

Therefore, the concentration of ibuprofen in a bottle of Motrin is 1.6 g/L.

The molecular formula of HFO2 tells us that it contains one hydrogen atom (H), one fluorine atom (F), and two oxygen atoms (O). The atomic masses of H, F, and O are 1.0, 19.0, and 16.0 g/mol, respectively.

Formula mass = (1 x atomic mass of H) + (1 x atomic mass of F) + (2 x atomic mass of O)

= (1 x 1.0 g/mol) + (1 x 19.0 g/mol) + (2 x 16.0 g/mol)

= 1.0 g/mol + 19.0 g/mol + 32.0 g/mol

= 52.0 g/mol

By adding the masses of each individual atom in the compound's formula, the formula mass is determined. The ions can be regarded as atoms for the purposes of determining the formula mass since a valid formula is electrically neutral (with no net electrons gained or lost).

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An ether's basic composition is as follows:

B. R-O-R

The oxygen atom is connected to two R groups, and R here stands for an alkyl or aryl group. Using the "oxy" group in place of the "alkyl" or "aryl" group, this structure is also referred to as an "alkoxy" group.

The two R groups could be the same or distinct. Ethers are a group of organic substances that are frequently employed as solvents, anesthetics, and chemical synthesis intermediate.

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To determine the number of moles of gas in the sample, we can use the Ideal Gas Law: PV = nRT

n = PV/RT

n = (1.99 atm)(85.81 L) / (0.0821 Latm/(molK) * 397.15 K)

n = 6.51 moles

Therefore, there are 6.51 moles of gas in the sample.

An ideal gas is a theoretical gas composed of randomly moving point particles not subject to intermolecular interactions.

The ideal gas law describes the behavior of ideal gases, which relates the pressure, volume, temperature, and number of moles of a perfect gas. Natural gases do not strictly obey the ideal gas law, particularly at high pressures and low temperatures where intermolecular interactions become significant.

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Answer:

an object or item that someone considers to be beautiful or attractive.

Answer:

(I) - B

(II) - C
(III) - C
(IV) - D

Explanation:

(I) both of carboxylic acids (B) and alcohols (E) are miscible in H2O, but carboxylic acids increase the acidity of water/solution

(II) Saturated hydrocarbons are from alkane hydrocarbons and they don't have pi bonds, only sigma bonds, and (C) is an alkane (Propane).

(III) Alkanes (C) are unreactive because of sigma bonds which are strong bonds that needs high energy to break

(IV) any unsaturated hydrocarbon (having pi bonds or double bonds, "==" in Lewis Structure) decolourizes Br2 since Br atoms react with the unsaturated hydrocarbon, producing bromo-alkane, for instance, 1-propene (D) + Br2 ---> 1-bromo propane

Answer:

Hypothesis: If I use SuperGro fertilizer on my tomato plants, then the harvest will be greater than if I do not use the fertilizer.

Experiment: I would divide my tomato plants into two groups. The first group would be the control group and receive no fertilizer. The second group would be the experimental group and receive SuperGro fertilizer. I would use the same type and number of tomato plants in both groups and plant them in the same location with the same amount of sunlight and water.

Control group: Tomato plants that receive no fertilizer

Experimental group: Tomato plants that receive SuperGro fertilizer

Independent variable: SuperGro fertilizer

Dependent variable: Tomato harvest

Control variables: type and number of tomato plants, location, amount of sunlight and water

Hypothetical results: The tomato plants in the experimental group that received SuperGro fertilizer produced double the amount of tomatoes compared to the tomato plants in the control group that did not receive fertilizer.

Conclusion: Based on the results of the experiment, it can be concluded that SuperGro fertilizer does have a significant effect on increasing tomato harvest. Therefore, using SuperGro fertilizer can be recommended for individuals who want to increase their tomato harvest.

Explanation:

The amount of hydrogen left over is 9.683 g.

The balanced chemical equation for the reaction between molecular hydrogen (H₂) and oxygen (O₂) to form water (H₂O) is:

2H₂ + O₂ -> 2H₂O

The equation shows that two moles of hydrogen react with one mole of oxygen to produce two moles of water.

To determine which reactant is left over, we need to calculate how much of each reactant is required for the reaction and compare it with the actual amount provided.

The reactant that is not completely consumed will be left over.

First, we need to convert the masses of hydrogen and oxygen to moles using their respective molar masses:

Molar mass of hydrogen (H2) = 2.016 g/mol

Molar mass of oxygen (O2) = 31.9988 g/mol

Number of moles of hydrogen = 10.0 g / 2.016 g/mol = 4.96 mol

Number of moles of oxygen = 10.00 g / 31.9988 g/mol = 0.3125 mol

From the balanced equation, we can see that 2 moles of hydrogen react with 1 mole of oxygen.

Therefore, the number of moles of oxygen required to react with 4.96 moles of hydrogen is:

0.5 x 4.96 = 2.48 mol

Since we only have 0.3125 mol of oxygen, it is the limiting reactant, and hydrogen is in excess.

To find out how much hydrogen is left over, we need to calculate how much hydrogen was used in the reaction:

Number of moles of water produced = Number of moles of oxygen used = 0.3125 mol

Number of moles of hydrogen used = 0.5 x 0.3125 = 0.15625 mol

The total number of moles of hydrogen we started with was 4.96 mol, and 0.15625 mol of hydrogen was used in the reaction.

Therefore, the amount of hydrogen left over is:

4.96 mol - 0.15625 mol = 4.80375 mol

Finally, we can convert this back to a mass:

Mass of hydrogen left over = 4.80375 mol x 2.016 g/mol = 9.683 g

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Answer:

The amount of hydrogen left over is 9.683 g.

Explanation:

The molarity of the solution is 1.112 M. To calculate the molarity of a solution, you need to know the amount of solute (in moles) and the volume of the solution (in liters).

The number of moles per litre of solution is how it is defined. It is employed to calculate the gramme equivalent in respect to the entire solution volume. It is employed for calculating the mole ratio in the solution's overall volume. Normality is measured in N or eq L-1 units.

First, you need to convert the given mass of NaCl into moles. The molar mass of NaCl is 58.44 g/mol.

Number of moles of NaCl = 65 g / 58.44 g/mol = 1.112 mol

Now, you can calculate the molarity of the solution using the formula:

Molarity = Number of moles of solute / Volume of solution in liters

Molarity = 1.112 mol / 1 L

Molarity = 1.112 M

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