You need 440 mL of a 30% alcohol solution. On hand, you have a 40% alcohol mixture. How much of the 40% alcohol mixture and pure water will you need to obtain the desired solution

The molarity of the stock solution is 7.5 * 10 ^- 6 M.

Molar attention is a measure of the awareness of a chemical species, especially of a solute in an answer, in terms of the quantity of substance consistent with the unit quantity of the answer. In chemistry, the maximum generally used unit for molarity is the range of moles according to liter, having the unit symbol mol/L or mol/dm³ in the SI unit.

Molarity (M) is the quantity of a substance in a positive volume of answer. Molarity is described because the moles of a solute in step with liters of an answer. Molarity is also called the molar awareness of a solution.

Molarity is defined as the range of moles of solute consistent with the liter of answer. Molality is described because of the number of moles of solute per kilogram of solvent. Normality is described as the variety of equivalents in line with the liter of answers.

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In a sample consisting of 2.50 g of methane (CH4), there are 4.5 × 10²³ atoms present.

To calculate the number of moles it is expressed as

Number of moles = [tex]\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

                             = [tex]\frac{2.50\ g}{16\ g/mol}[/tex]

                             = 0.15 mol

1 mole of methane contains 6.022 × 10²³ molecules

0.15 mole of methane will contain

= [tex]\frac{0.15 \times 6.022 \times 10^{23}}{1}[/tex]

= 0.9 × 10²³ molecules

=  0.9 × 10²³ × 5 atoms

= 4.5 × 10²³ atoms of methane

Thus from the above conclusion we can say that In a sample consisting of 2.50 g of methane (CH4), there are 4.5 × 10²³ atoms present.

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Answer:

B. The products are nuclei of elements that are different from the original elements.

The specific heat of the unknown metal is 0.859 J/g⁰C.

Heat lost by the unknown metal = Heat gained by water

m₁c₁Δθ₁ = m₂c₂Δθ₂

where;

(15)(c₁)(99 - 26) = (75)(4.18)(26 - 23)

1095c₁ = 940.5

c₁ = 940.5/1095

c₁ = 0.859 J/g⁰C

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Answer:

2.61 L

Explanation:

p1v1 = p2v2

p1v1 / p2 = v2

98 * 2 / 75 = v2 = 2.61 L

Answer:

The list of quantities of components, ingredients, and materials required to produce a product is the. master schedule.

Answer:

26.81 moles

Explanation:

From the coefficients of the equation, we know that for every 2 moles of iron(III) oxide produced, 7 moles of oxygen are consumed.

So, the answer is 7.66(7/2), which is 26.81 mol.

Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles C3H8, or 44.09562 grams

Answer: the temperature decreases

Explanation:

- An endothermic reaction absorbs heat which is taken from its immediate surroundings, causing the temperature to decrease

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Answer:

6.627 x10^26    electrons

Explanation:

Each Na atom has 11 electrons

Mole weight = 22.989 gm/mole  

2300gm /22.989 gm/mole * 6.022 x 10^23  atoms/mole  * 11 electrons/atom

     = 6.627 x 10 ^26   electrons  

The volume of 0.8 M solution of citric acid required would be 75mL.

Given:

Concentration of citric acid =0.8M

Mass of baking soda = 15 g

Balanced chemical equation for the reaction of baking soda(NaHCO₃ ) with citric acid (C₆H₈O₇) is:

C₆H₈O₇ + 3NaHCO₃ -----> 3H₂O + 3CO₂ + Na₃C₆H₅O₇

Therefore, 1 mole of citric acid needs 3 moles of baking soda

Molar mass of baking soda = 84g/mol

No. of moles of baking soda = mass of baking soda / molar mass of baking soda = 15g ÷ 84g/mol = 0.178 moles

Thus no. of moles of citric acid required = (1 ÷ 3) × 0.178mole =0.06mole

Molarity = no. of moles of  / volume (in mL) x 1000

Volume of citric acid solution required= (0.06mole ÷ 0.8M) × 1000ml

                                                                =75ml

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Mass of liquid present in the container:

Yes, the liquid will be present, and of 1.2481 g

Calculation:

Given:

Volume = 1.5L

Temperature = 25 + 273 = 298K

P = 23.76 torr = 0.0312 atm

Using the ideal gas equation:

PV = nRT

Where:

making n subject of formula:

n = [tex]\frac{PV}{RT}[/tex]

By putting all the values in the given equation, we get,

n = 0.0312 x 1.5 / 0.0821 x 298

n = 0.0019 moles

So, 0.00189 are moles of water in the vapor

Now, subtract  1.25g of water from moles of water vapor, and we will get the mass of the liquid left,

1.25 - 0.0019 = 1.2481 g

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Answer:

It expands to its secluded area.

Explanation:

Any substance that is heated will have its molecules and atoms move more quickly, expanding the distance between them all. The term "expansion" is used more frequently to describe this growth in space. Heat causes all stuff, including solids, liquids, and gases, to expand.

In some cases, heating solids causes them to transform into liquids. However, they could revert to their solid state after cooling. Similar to this, certain liquids turn into gaseous states when heated. Instead of altering their condition, gases, on the other hand, frequently expand and raise the pressure inside a container.

Scientists typically blow up balloons to test the expansion of gases, exposing some to the light while leaving others at room temperature. It is demonstrated that heat causes gases to expand when balloons exposed to the sun grow in size while those at ambient temperature remain unchanged.

The vital capacity will be 4600ml.

The highest amount of air a person can inhale following their maximal exhalation is known as their vital capacity. It is equivalent to the total of the inspiratory, tidal, and expiratory reserve volumes. It roughly corresponds to Forced Vital Capacity. A wet or conventional spirometer can assess a person's vital capacity.

Normal people have a 3 to 5-liter vital capacity.

It enables simultaneous inhalation of the greatest possible volume of clean air and exhalation of the greatest possible volume of stale air. So, by increasing gaseous exchange between the body's various tissues, it improves the amount of energy available for bodily function.

VC = TV₊IRV₊ERV

where,

VC = Vital capacity

TV = Tidal volume

IRV = inspiratory reserve volume

ERV = expiratory reserve volume

VC = 500 ₊ 3000 ₊ 1100

VC = 4600ml

Therefore, the vital capacity will be 4600ml.

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Answer:

letter to your mother telling her about the celebrations of your birthday at school

The partial pressure of Xe is 2.60atm

The sum of the partial pressures is equal to the total pressure. Ptotal = P1 + P2 + P3... .To calculate the partial pressure of one of the components of a mixture, subtract the sum of known partial pressures of the other components from the total pressure.

Given the values of

PHe=0.20 atm

PAr=0.20 atm

Ptotal=3.00 atm

We need to find  PXe

Solution: Determine the sum of the partial pressures of helium and argon, then subtract the sum from the total pressure.

PHe+PAr =0.20 atm + 0.20=0.400 atm

PXe=3.00atm−0.400=2.60 atm

Each gas that makes up a mixture of gases has a partial pressure, which is the notional pressure of that gas as if it alone filled the original combination's complete volume at the same temperature.

According to Dalton's Law, a perfect gas mixture's total pressure equals the sum of its constituent gases' individual partial pressures.

The thermodynamic activity of a gas's molecules is gauged by its partial pressure.

Gases react, disperse, and dissolve based on their partial pressures rather than the concentrations they have in liquids or other gas combinations.

This general characteristic of gases holds true in biological chemical interactions involving gases.

Hence the partial pressure of Xe is 2.60atm

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Which bomb was created as a part of the manhattan project?

The manhattan project was responsible for the creation of the atomic bomb.

What was the manhattan project?

The first nuclear weapons were created as a result of the Manhattan Project's research and development efforts during World War II. With the help of the United Kingdom and Canada, it was spearheaded by the United States. Major General Leslie Groves of the U.S. Army Corps of Engineers oversaw the project from 1942 to 1946. Robert Oppenheimer, a nuclear physicist, served as the lab's director and was responsible for the actual bomb's design, the atomic bomb.

As the Army's first headquarters were located in Manhattan, the project's Army component was given the moniker Manhattan District, gradually replacing the official codename for the entire project, Development of Substitute Materials. The project eventually absorbed Tube Alloys, its previous British counterpart. The Manhattan Project started out small in 1939, but it eventually employed over 130,000 people and cost close to US$2 billion (about $23 billion in 2020). Less than 10% of the cost went toward the design and production of the weapons, with more than 90% going toward the construction of factories and the production of fissile material. More than thirty locations in the United States, the United Kingdom, and Canada were used for research and production.

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The temperature is 370K.

The volume of a given fuel pattern is immediately proportional to its absolute temperature at regular pressure (Charles's law). The volume of a given amount of fuel is inversely proportional to its pressure whilst temperature is held steady (Boyle's regulation).

Density is immediately proportional to stress and indirectly proportional to temperature. As stress increases, with temperature constant, density will increase. Conversely when temperature increases, with strain regular, density decreases.

The equations describing those legal guidelines are unique cases of the best gasoline regulation, PV = NRT, wherein P is the pressure of the gas, V is its extent, n is the number of moles of the gas, T is its kelvin temperature, and R is the ideal (common) gas constant.

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0.03154 mol H₂O is formed from 0.0636 g of hydrogen if we consider that  O₂ is a limiting reagent.

The balanced equation is

[tex]2H_{2} (g)[/tex] + [tex]O_{2} (g)[/tex] → [tex]2H_{2} O (l)[/tex]

Here, we are calculating the moles  [tex]H_{2}O (l)[/tex] from the moles of H₂ if we consider O₂ is a limiting reagent:

Given:

The mass of  H₂ = 0.0636 g

We know that,

The moles of  H₂ = (0.0636 g of  H₂) × [tex]\frac{1.0 mol H_{2} }{2.016 g H_{2} }[/tex]

                             = 0.03154 mol  H₂

Moles of  H₂O (l) from  H₂ = ( 0.03154 mol  H₂) × [tex]\frac{2.0 mol of H_{2} O (l)}{2.O mol H_{2} }[/tex]

                                          = 0.03154 mol H₂O

Therefore,  0.03154 mol H₂O is formed from 0.0636 g of hydrogen if we consider that  O₂ is limiting reagent.

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The arrow that will represent the phase change that involves the same amount of energy as arrow 1 will be arrow 4.

Arrow 1 represents a phase change from liquid to gas while arrow 4 represents a phase change from gas to liquid.

In other words, arrow 1 and arrow 4 are direct opposites of one another,

This means that if X amount of energy is required for arrow 1, the same amount of energy will be needed for arrow 4 but in the reverse direction.

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Answer:

The correct answer would be option C. 4!

Explanation:

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I just got this question right on Edge :P

Answer:

it helps in respiration

Protons Ha and Hb in the compound given are enantiotopic.

Enantiotopic protons can be defined as those protons that can be replaced by another groups like deuterium.

A compound is a substance which contains two or more elements chemically combined together.

So therefore, Protons Ha and Hb in the compound given are enantiotopic.

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Net Product formed:

The conversion of 1 mol of fructose 1,6-bisphosphate to 2 mol of pyruvate by the glycolytic pathway results in a net formation of  2 mol of NADH and 4 mol of ATP.  

Glycolysis:

The energy-intensive stages also known as the first half of glycolysis. It divides the six-carbon sugar molecule evenly into two three-carbon molecules. The energy-releasing stages, or the second half of glycolysis, draw energy from the molecules and store it as ATP and NADH, the reduced form of NAD.

Two pyruvate molecules form the final product of glycolysis, which begins with glucose and two ATP molecules and two NADH molecules are gained by the cell as a net result.

The first half of the process requires the utilization of two ATP molecules to set up the six-carbon ring for cleavage. But since this pathway is starting from fructose 1,6-bisphosphate, the utilization step is omitted thus four molecules of ATP and two molecules of NADH are produced in total.

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The number of molecules of nitrogen will be the same as the number of molecules of hydrogen. The correct option is C.

The law states that different gases of the same volume stored at the same temperature and pressure will contain the same number of molecules.

Going by Avogadro's law, 500 ml of nitrogen and 500 ml of hydrogen kept together in one vessel at the same constant temperature and pressure will have the same number of molecules.

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Answer:

C3 H6 O2

Explanation:

first divide their mass by their respective molar mass, we get:

30.4 moles of C

61.2 moles of H

20.25 moles of O

now divide everyone by the smallest one of them then we get

C= 1.5

H= 3

O= 1

since our answer of C is not near to any whole number so we will multiply all of them by 2

so,

C3 H6 O2 is our answer

Answer:

A.) PCl₅

Explanation:

To determine the empirical formula, you need to (1) identify the atomic masses of both elements (from the periodic table), then (2) convert each element from grams to moles (via atomic masses), then (3) divide both elements by the smallest molar value of both, and then (4) construct the empirical formula.

(Step 1)

Atomic Mass (P): 30.974 g/mol

Atomic Mass (Cl): 35.453 g/mol

(Step 2)

 3.72 g P           1 mole
---------------  x  ------------------  =  0.120 mole P
                         30.974 g

21.28 g Cl             1 mole
-----------------  x  -------------------  =  0.600 mole Cl
                            35.453 g

(Step 3)

Because 0.120 mole is smaller than 0.600 mole, you need to divide both elements by this value to determine the ratio of the elements in the empirical formula.

0.120 mole P / 0.210 mole = 1.00 mole P

0.600 mole Cl / 0.210 mole = 5.00 moles Cl

(Step 4)

The molar value of each element represents the amount of each element in the formula. This value shows itself in the form of subscripts in the formula. This makes the correct empirical formula:

PCl₅

Answer:

The answer is C2H4O2

The concentration of the solute is directly proportional to the osmolarity of the solution and osmotic pressure.

Thus, the concentration of the solute directly proportional to the osmolarity of the solution and osmotic pressure.

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Answer:

[tex]\huge\boxed{\sf 3 \ electrons}[/tex]

Explanation:

[tex]1s^22s^22p^1[/tex]

The outermost/valence shell is the second one, seeing from the electronic configuration.

= 2 + 1 = 3 (electrons are raised to the power in the electronic configuration)

Since, the valence shell here is 2, the electrons of second shell will be counted as valence electrons.

[tex]\rule[225]{225}{2}[/tex]

Answer:

3.0395m

Explanation: