A shop-vac is capable of pulling in air at a rate of 210ft^3/min. What is the rate of the vacuum's air flow in L/s.
A hollow spherical iron ball has a diameter of 15.3 cm and has a mass of 10.1 kilograms. Assuming the hole inside the ball is spherical with the same center as the center of the ball, what is the thickness in cm of the layer of iron surrounding the hole? The density of iron is 7.86 g/cm3. (The volume of a sphere is (4/3)πr3.)

4x + 13

4 * -3 + 13

-12 + 13

1

Answer: 4.5 moles of \(H_{2}\) can be made from complete reaction of 3.0 moles of Al.

Explanation:

The given reaction equation is as follows.

\(2Al + 6HCl \rightarrow 2AlCl_{3} + 3H_{2}\)

This shows that 2 moles of Al reacts with 6 moles of HCl. So, the amount of HCl required to react with 1 mole Al is three times the amount of HCl.

Therefore, 3 moles of Al will react with 9 moles of HCl to give 3 moles of \(AlCl_{3}\) and \(\frac{9}{2}\) moles of \(H_{2}\).

The reaction equation now will be as follows.

\(3Al + 9HCl \rightarrow 3AlCl_{3} + \frac{9}{2}H_{2}\)

The moles \(\frac{9}{2}\) can also be written as 4.5 moles.

Thus, we can conclude that 4.5 moles of \(H_{2}\) can be made from complete reaction of 3.0 moles of Al.

4.5 moles of H2 can be made from complete reaction of 3.0 moles of Al with hydrogen chloride.

STOICHIOMETRY:

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If a solution is prepared by dissolving 23.7 g of CaCl₂ in 375 g of water and the density of the resulting solution is 1.05 then the concentration of Cl⁻ in this solution is 1.196 M.

To calculate the concentration of Cl⁻ in a solution prepared by dissolving 23.7 g of CaCl₂ in 375 g of water, we need to first calculate the moles of Cl- present in the solution.

1: Calculate the moles of CaCl₂ present in the solution.

Molar mass of CaCl₂ = 40.08 + (2 × 35.45) = 110.98 g/mol. Number of moles of CaCl₂ = mass / molar mass = 23.7 g / 110.98 g/mol = 0.2133 mol

2: Since 1 mole of CaCl₂ contains 2 moles of Cl⁻, the number of moles of Cl- present in the solution is 2 × 0.2133 = 0.4266 mol

3: Calculate the volume of the solution using its density.

Volume = mass / density = 375 g / 1.05 g/mL = 357.14 mL = 0.35714 L

4: Calculate the concentration of Cl-.

The concentration of Cl⁻ = number of moles/volume of solution

= 0.4266 mol / 0.35714 L= 1.196 M.

The concentration of Cl⁻ in this solution is 1.196 M.

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The concentration of Cl- in a solution can be found by determining the number of moles of Cl-, calculating the volume of the solution, and dividing the moles of Cl- by the volume.

In order to find the concentration of Cl-, we first need to determine the number of moles of Cl-. Given that the molar mass of CaCl2 is roughly 110.98 g/mol, we can find this by dividing the mass of CaCl2 (23.7 g) by the molar mass (110.98 g/mol). Since there are two moles of Cl- for each mole of CaCl2, this gives us the number of moles of Cl-.

The density of the solution is given as 1.05 g/mL, from which the volume can be determined by dividing the total mass of the solution (375 g + 23.7 g) by the density. The concentration of Cl-, in moles per liter, is then calculated by dividing the number of moles of Cl- by the volume of the solution in liters.

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A. The phase of bromobenzene at 40°C and 1 atm is a *liquid*.

b. The phase of fluorobenzene at 25°C and 1 atm is a *liquid*.

A- According to the given information, the vapor pressure of bromobenzene at 40°C is 10 mm Hg. Vapor pressure is the pressure exerted by the vapor of a substance in equilibrium with its liquid phase at a given temperature. When the vapor pressure of a substance equals the external pressure (1 atm in this case), the substance boils and transitions from the liquid phase to the gas phase.

Since the vapor pressure of bromobenzene at 40°C (10 mm Hg) is lower than the external pressure of 1 atm, bromobenzene does not reach its boiling point and remains in the liquid phase.

B- The normal boiling point of a substance is the temperature at which its vapor pressure equals the external pressure of 1 atm. In this case, the normal boiling point of fluorobenzene is given as 84.7°C.

Since the temperature of 25°C is below the normal boiling point of fluorobenzene, it does not reach its boiling point and remains in the liquid phase. At 25°C and 1 atm, the vapor pressure of fluorobenzene is lower than the external pressure, indicating that it will not undergo a phase change to the gas phase. Therefore, fluorobenzene exists as a liquid at 25°C and 1 atm.

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There are several steps to draw lewis dot structure of any chemical compound. Here, we taking RbF.  Structure is given below with the image.

1. Start by writing the chemical symbol for the element at the center of the structure. In this case, it is Rb for Rubidium.

2. Draw dots around the symbol to represent the valence electrons. Rb has one valence electron, so you would put one dot around the Rb.

3. Next, write the chemical symbol for the other element in the compound, in this case F for Fluorine.

4. Draw dots around the symbol to represent the valence electrons. Fluorine has 7 valence electrons, so you would put 7 dots around the F.

5. To create the bond between the two elements, use a pair of dots to connect the Rb and F. This represents the sharing of electrons between the two elements.

So the Lewis dot structure for RbF would be represented as:

        . .

Rb+ [:F:]

        . .

This representation shows that Rb and F share one pair of electrons, forming a bond between them, and the dots around Rb and F represent the remaining number of valence electrons that are not involved in the bond.

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Answer:

Water can hold a lot of heat inside it and as the climate starts getting cold, the water releases the heat which heats up the climate

Due to the fact that water has a high heat capacity, its temperature has a very limited range, which causes the coastal areas close to having a similar small daily and seasonal temperature range.

"When the temperature of a material rises 1 K (or 1 °C), the amount of heat (J) absorbed per unit mass (kg)".

When the weather begins to grow chilly, water releases the heat it has stored inside, warming the environment.

High specific heat of the water makes it temperature resistant, and it helps the earth to maintain its temperature and helps organisms to maintain their functions at a constant temperature of the earth.

Thus, the normal temperature is necessary for maintaining the temperature of the earth and the water bodies maintain the temperature of the earth.

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The concentration of the vial is 0.5 %. We will suppose that it is % w/v. The concentrarion % w/v is defined as:

% w/v = mass of solute in g/volume of solution in mL * 100

We have to find the mL that we have to administer to deliver 20 mg. Let's convert those mg into g. We know that there are 1000 mg in 1 g.

1000 mg = 1 g

mass of solute in g = 20 mg * 1 g/(1000 mg)

mass of solute in g = 0.020 g

Now that we know the concentration of the solution and the mass in grams of the medication, we can find the volume in mL.

% w/v = mass of solute in g/volume of solution in mL * 100

0.5 = 0.020 / volume of solution in mL * 100

volume of solution in mL = 0.5/(100 * 0.020)

volume of solution in mL = 0.25 mL

Answer: we need to administer 0.25 ml

Answer:

150

Explanation:

i think that was the answer

The pressure of the oxygen at 60°C and a volume of 0.39 dm³ is 3.5 × 104 nm-².

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:

(P1 x V1) / T1 = (P2 x V2) / T2

where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, and P2, V2, and T2 are the final/absolute pressure, volume, and temperature.

We are given the following:

Initial pressure P1 = 1.01 × 105 nm-² (nanometers squared)

Initial volume V1 = 0.15 dm³

Initial temperature T1 = 60°C = 333 K

Final volume V2 = 0.39 dm³

Final temperature T2 = 60°C = 333 K

We need to find the final pressure P2.

Plugging these values into the combined gas law, we get:

(P1 x V1) / T1 = (P2 x V2) / T2

(1.01 × 105 nm-² x 0.15 dm³) / 333 K = (P2 x 0.39 dm³) / 333 K

Simplifying this equation, we get the following:

P2 = (1.01 × 105 nm-² x 0.15 dm³ x 333 K) / (0.39 dm³ x 333 K)

P2 = 3.5 × 104 nm-²

Therefore, the pressure of the oxygen at 60°C and a volume of 0.39 dm³ is 3.5 × 104 nm-².

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Answer:

Mass = 312 g

Explanation:

Given data:

Number of molecules of H₂ = 9.4 × 10²⁵

Mass in gram = ?

Solution:

First of all we will calculate the number of moles of H₂.

1 mole of H₂ contain 6.022× 10²³ molecules

9.4 × 10²⁵ molecules  × 1 mol / 6.022× 10²³ molecules

1.56× 10² mol

156 moles of H₂:

Mass in gram:

Mass = number of mole × molar mass

Mass = 156 mol × 2 g/mol

Mass = 312 g

The empirical formula for the citric acid is C₆H₈O₇

Divide by their molar mass

C = 37.51 / 12 = 3.126

H = 4.2 / 1 = 4.2

O = 58.29 / 16 = 3.643

Divide by the smallest

C = 3.126 / 3.126 = 1

H = 4.2 / 3.126 = 1.34

O = 3.643 / 3.126 = 1.17

Multiply through by 6 to express in whole number

C = 1 × 6 = 6

H = 1.34 × 6 = 8

O = 1.17 × 6 = 7

Thus, the empirical formula for the citric acid is C₆H₈O₇

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The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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A system's equilibrium will move to the right, or toward the side of the products, in accordance with Le Chatelier's principle, if more reactants are added. ... The equilibrium will move to the left if we add more product to a system, producing more reactants.

Solution: By increasing the number of reactants, the equilibrium moves to the right and in the direction of the products.

Thus, if a reactant is added, equilibrium shifts to the right, away from the reactant. Equilibrium shifts to the left, away from the product, when a product is added. If we take away the product, equilibrium returns and produces the product. Reactant is created if reactant is removed, breaking the equilibrium.

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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When adding ice to a hot soup, it is generally recommended to use ice made from potable or drinkable water.

The water used to make the ice should be clean and free from any contaminants that could affect the taste or safety of the soup.

It is advisable to use filtered or purify water to make the ice to ensure that it is of good quality. This helps prevent any unwanted flavors or impurities from transferring to the soup.

Using tap water can also be acceptable if it meets the drinking water standards in your area and is considered safe for consumption. However, if you have concerns about the quality of your tap water, using filtered water is a safer option.

Ultimately, the goal is to add ice made from water that is safe and of good quality to avoid any negative impact on the taste or safety of the soup.

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Based on the given information, it can be inferred that delta S for the reaction at 600K is positive. The delta S for the reaction CH3OH (g) = CO (g) + 2H2 (g) at 600K can be inferred to be positive.

The fact that the reaction goes essentially to completion suggests that it is highly spontaneous, which indicates a large negative delta G. We can use the equation delta G = delta H - T delta S, where delta H is the enthalpy change and T is the temperature, to determine the sign of delta S.

The enthalpy change (Delta H) is given as +91 kJ/mol, which is a positive value, and the temperature is 600K. To make the Gibbs free energy change (Delta G) negative and ensure that the reaction is spontaneous, the entropy change (Delta S) must be positive. This is because a positive entropy change will result in a larger negative value when multiplied by the temperature, and will overcome the positive enthalpy change to make Delta G negative.

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The percent yield of zinc carbonate is 5.91%. This suggests that the reaction did not go to completion, and there was likely some loss of product during the experiment.

To find the percent yield of zinc carbonate, we need to compare the actual yield (what was obtained in the experiment) to the theoretical yield (what would be obtained if the reaction went to completion).

First, let's calculate the theoretical yield of zinc carbonate:

Now, let's calculate the percent yield:

The actual yield  \(ZnCO_{3}\) is given as 12.6 g.

The percent yield is calculated as:

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Full Question: A reaction between 1.7 moles of zinc iodide and excess sodium carbonate yields 12.6 grams of zinc carbonate. This is the equation for the reaction: Na2CO3 + ZnI2 → 2NaI + ZnCO3. What is the percent yield of zinc carbonate? The percent yield of zinc carbonate is %

Answer:

5 simple characteristics of bacteria-

Single-Celled.

Absent Organelles.

Plasma Membrane.

Cell Walls.

DNA.

Explanation:

Al₂O₃ is used as an adsorbent, desiccating agent, and catalyst, and in the manufacture of dental cements and refractories.

Aluminium oxide is used for its hardness and strength. It is widely used as an abrasive, including as a much less expensive substitute for industrial diamond. Many types of sandpaper use aluminium oxide crystals.

Aluminium is a chemical element having the atomic number 13, and chemical symbol Al. Alumina is a chemical compound having the chemical formula Al₂O₃. Therefore, the key difference between aluminium and alumina is that the aluminum is a chemical element, and alumina is an aluminium containing compound.

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Considering the definition of mass volume percentage, a mass of NaCl of 45 grams is required to prepare 60ml of a 75% solution.

A mass volume percentage is a ratio of the mass of a solute to the volume of the solution, expressed as a percentage. The mass/volume percentage is calculated as the mass of solute divided by the volume of solution:

mass volume percentage= (mass of solute÷ volume of solution)×100%

In this case, you know:

Replacing in the definition of mass volume percentage:

75% grams/mL= (mass of solute÷ 60 mL)×100%

Solving:

75% grams/mL÷100%= mass of solute÷ 60 mL

0.75 grams/mL= mass of solute÷ 60 mL

0.75 grams/mL×60 mL= mass of solute

45 grams= mass of solute

Finally, a mass of NaCl of 45 grams is required.

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And let us address the bottle capacity....and this is given by the product. We know that, 1ml= 10⁻³ L

126,515 × 0.335 L =   42382 .525 L and it is the the bottle capacity.

The number of bottles you need is given by

33500/ 0.355=  9436 Bottles and there are enough caps . The limiting quantity is the beverage and there are  reserve bottles and caps for the breakages and the failed seals that will undoubtedly occur.

Having brewed beer, ginger beer, or other beverages at home (and this is something that it is easy to do, and you get VERY good results). Most of the time, the bottles are the finite resource. You must gather, carefully clean, and disinfect each bottle.

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Answer:

Cl⁻ Or A

Explanation:

Answer:

D: fussion

Explanation:

The process called nuclear fussion.

for example, four hydrogen atoms combine in a nuclear fussion reaction to form one helium atom.

answer and explanation

the first step is to balance the reaction equation

N₂ + 2O₂ > 2NO₂

now that we have balanced the equation we can calculate the number of moles of nitrogen

mols = mass / molar mass

= 62.7 g/ 14.00g/mol

= 4.48 mols

we see from the balanced equation that the mol ratio of nitrogen and nitrogen oxide is 1:2

therefor the number of mols of nitrogen oxide that will form will be

2 x 4.48 = 8.96 mol of nitrogen oxide.

now that we have the mols we can then calculate the volume using the ideal gas equation

PV =nRT

V = (nRT)/P

= (8.96 x 0.0821 x 620) / 0.72

= 633.5L

Answer:

10.5 dm3 O2

0.94 moles de MgO

Explanation:

La pregunta dice explícitamente que el magnesio es puro en un 90%.

Por lo tanto, masa de magnesio puro = 90/100 * 25G = 22,5 g

Número de moles de Mg = 22,5g / 24g/mol = 0,94 moles de Mg

La ecuación de reacción es;

2Mg (s) + O2 (g) ------> 2MgO (s)

Si 2 moles de Mg reaccionan con 1 moles de O2

0.94 moles de Mg reacciona con 0.94 * 1/2 = 0.47 moles de O2

Si 1 mol de O2 ocupa 22,4 dm3

0.47 moles de O2 ocupan 0.47 * 22.4 / 1 = 10.5 dm3

También;

2 moles de Mg producen 2 moles de MgO

Entonces, 0.94 moles de Mg producen 0.94 moles de MgO

Answer:

3750 m

Explanation:

We must first know the speed of sound in water in order to solve this problem.

So, speed of sound in water = 1500 meters per second

Now time taken = 5 seconds

Given that;

v = 2x/t

where x is the distance below;

vt = 2x

x = vt/2

x = 1500 * 5/2

x = 3750 m

Answer: Negative electrons are attracted to the positive nucleus. This force of attraction keeps electrons constantly moving around the nucleus. The region where an electron is most likely to be found is called an orbital.

Answer: They are are simular because when the wax cools down its not hot  or it cools down it is the same with hot water it cools after along while.

Explanation: