What is the total number of moles contained in 115 grams
of C₂H5OH?
A. 1.00
B. 1.50
C. 2.50
D. 3.00

Answer:

44.91% of Oxygen in Iron (III) hydroxide

Explanation:

To solve this question we must find the molar mass of Fe(OH)3 and the molar mass of the oxygen in this molecule. Percent composition will be:

Molar mass Oxygen / molar mass Fe(OH)3 * 100

Molar mass Fe(OH)3 and oxygen:

1Fe = 55.845g/mol*1 = 55.845

3O = 16.00g/mol*3 = 48.00 - Molar mass of Oxygen

3H = 1.008g/mol*3 = 3.024

55.845 + 48.00 + 3.024 =

106.869g/mol is molar mass of Fe(OH)3

% Composition of oxygen is:

48.00g/mol / 106.869g/mol * 100 =

The pressure in the left intrapleural cavity changes when the valve was opened as : It went from negative number to zero and the pressure in intrapleural cavity equalized with the atmospheric pressure.

The pressure inside the pleural cavity is called as intrapleural pressure. It is characterized as negative pressure when the pressure inside the pleural cavity is typically only a little bit lower than the ambient pressure.

The external intercostal muscles and diaphragm contract during inspiration, expanding the thoracic cavity. As a result, the intrapleural pressure decreases, increasing the transpulmonary pressure and expanding the lungs.

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The aforementioned claim is TRUE; as carbon-14 degrades steadily, it can be used to accurately estimate the age of rock samples.

The radioactive isotope of carbon 14 (14C) decays at a constant, well-known pace. Scientists can ascertain how long ago an organic substance died by calculating the quantity of 14C present in a sample of the material, such as bone or wood. This process, known as radiocarbon dating, is frequently used in geology and archaeology to date objects that are up to 50,000 years old.

Since carbon-14 decays steadily, it provides a trustworthy way to estimate the age of rock samples.

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Answer:

1st one

Explanation:

Answer:

Moths are hunted and killed in a variety of ways. I'll explain how we go about hunting and killing moths.

Explanation:

Step-by-Step:

Obtain a sticky trap in the morning and afternoon. It's available at Target and Walmart. Cover it in moth pheromones or anything else you know will attract moths. They will be stuck in the sticky trap for a long time and will eventually die as a result of not being able to escape.

At night, get or buy a lamp and turn it on. This will attract a lot of moths and make them easier to see. Then spray the area with insecticide or insect repellent. Finally, they should perish.

Tip: If a large swarm of moths becomes too much for you to handle, call pest control and they will get rid of them for you!

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Answer:

they were facing the oppisite ways

Explanation:

Answer:

salt and hydrogen gas

Explanation:

acid + metal = salt + hydrogen

Answer:

hope this helps

Explanation:

hydrogen gas

An acid will react with a metal to form a salt and hydrogen gas. The general word equation for the reaction between an acid and a metal is as follows: acid + metal → salt + hydrogen.

(A) Vol. of solvent is 119.8 ml, (B) Molarity (M) of sol. is 5.00 M, (C) V1 of copper nitrate solution is 187.5 ml, (D) The instruction given is false.  

(A). To calculate the volume (ml) of a 2.25 M potassium hydroxide solution that contains 15.0 g of solute, we can use the formula:

The unit of measurement for molarity (M) is moles of solute per liter of solvent.

Rearranging the formula to solve for liters of solvent:

Molecularity = moles of solute / liters of solvent (M)

We know that the molar mass of potassium hydroxide (KOH) is 56.1 g/mol. To find the moles of solute, we can divide the given mass (15.0 g) by the molar mass of KOH:

15.0 g / 56.1 g/mol = 0.2679 moles

Now we can plug this value into the formula above:

Liters of solvent = 0.2679 moles / 2.25 M

Liters of solvent = 0.1198 L or 119.8 ml (rounded to 3 significant figures)

(B). To calculate the molarity of a solution containing 1.25 moles of glucose in 250. ml of solvent, we can use the formula:

The unit of measurement for molarity (M) is moles of solute per liter of solvent.

Plugging in the given values:

Molarity (M) = 1.25 moles / 0.250 L

Molarity (M) = 5.00 M

(C). To calculate the volume of a 10.00 M copper(II) nitrate solution that must be added to water to prepare 750.0 ml of a 2.500 M solution, we can use the formula:

M1V1 = M2V2

Where M1 and V1 are the concentration and volume of the original solution, and M2 and V2 are the concentration and volume of the final solution.

We know that the final solution has a volume of 750.0 ml and a concentration of 2.500 M, so we can plug in these values for V2 and M2:

M1V1 = 2.500 M x 750.0 ml

Now we can solve for V1 (the original volume) by rearranging the formula:

V1 = M2V2 / M1

V1 = (2.500 M x 750.0 ml) / 10.00 M

V1 = 187.5 ml (rounded to 4 significant figures)

(D). The instructions "Take 100.0 mL of the 10.0 M solution and add 900.0 mL water" are not correct for diluting a 10.0 M solution to a 1.00 M solution.

To achieve this dilution, you would need to take a smaller volume of the 10.0 M solution and add a larger volume of water, because the final volume should be larger than the starting volume.

For example, you could take 10.0 mL of the 10.0 M solution and add 90.0 mL of water, which would give you a final volume of 100.0 mL and a concentration of 1.00 M. The instruction given above is false.

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Answer:

Yes, she will be able to recover enough magnesium chloride from the original flask to continue the experiment

Explanation:

The solution prepared by the scientist contains 12.7g of magnesium chloride. The sunlight will evaporate only the water present. When the volume decreases, the magnesium chloride precipitates. When all water evaporates, all the solute, magnesium chloride precipitates totally.

That means she will recover the 12.7g of magnesium chloride.

Answer: Yes, she will be able to recover 12.7g in the flask

Explanation: Founders Educere answer

The net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid is B. Na+ (aq) + F- (aq) + H+ (aq) + Cl- (aq) → Na+ (aq) + Cl- (aq) + HF (aq)

This is the net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid. The balanced equation for this reaction is NaF (aq) + HCl (aq) → NaCl (aq) +HF (aq).

The net ionic equation is derived by canceling out the spectator ions, which are ions that don't participate in the chemical reaction. In this case, Na+ and Cl- are spectator ions, which means that they don't participate in the reaction and are present in the same form on both sides of the equation. Therefore, they are cancelled out, leaving the net ionic equation Na+ (aq) + F- (aq) + H+ (aq) + Cl- (aq) → Na+ (aq) + Cl- (aq) + HF (aq).

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Answer: The crest and trough of two waves intersect.

Explanation:

The best description of the constructive interference of light is the crest and trough of two waves intersect.

When two waves travel in the same direction and are in phase with each other, their amplitude gets added, and the resultant wave is obtained. Here, the waves are said to have undergone constructive interference.

Constructive interference is a type of interference that occurs at any location along the medium where the two interfering waves have a displacement in the same direction

The best description of the constructive interference of light is the crest and trough of two waves intersect.

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x + (360 - x) = 360 * 0.50

where x is the amount of the 60% acid solution.

Solving for x, we get: x = 360 * 0.50 - 360 x = 180

Therefore, you will need to mix 180 L of the 60% acid solution with 180 L of the 15% acid solution to get 360 L of a 50% acid solution.

Acid is a substance that has a pH level of lower than 7.0 and is capable of corroding or dissolving other substances. It is usually found in aqueous solutions and is a highly reactive substance. Examples of acid include sulfuric acid, hydrochloric acid, nitric acid and acetic acid. These are used in a variety of industries such as food production, industrial cleaning and chemical engineering.

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Irony of situation is a discrepancy between the expected result and actual results. Irony involves the perception that things are not what they are said to be or what they seem.

One thing is expressed while another is meant in an ironic statement. For example, on a chilly, wet gray day, you would exclaim, "What a gorgeous day!" Alternatively, if you were suffering from a severe case of food sickness, you may respond, "Wow, I feel terrific today." "ffers points of view and ideas that are, at most, intriguing... However, it does not reach the truth." Ronagh and Souder are particularly concerned with scientific assertions that are not meant to be taken seriously.

Here,

The irony of the issue is the difference between the expected and actual results. Irony is the impression that things are not what they appear to be or what they are purported to be.

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4.6 is the pH of the juice if hydrogen ion concentration of a fruit juice is 2.5 x 10-5 M.

pH is the measure of acidity or alkalinity of a solution.

It is measured by taking negative logarithm of hydrogen ion concentration.

pH = -log [[tex]H^+[/tex]]

Given [tex][H^+][/tex] =  2.5 x [tex]10^-^5[/tex] M.

pH = -log [ 2.5 x [tex]10^-^5[/tex] M]

pH = 4.6

Hence, 4.6 the pH of the juice.

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As the air gets warmer it rises because,  particles spread out making it less dense. The diffusing capability of gas molecules make it possible.

Intermolecular force are the force that keep the particles of a substance binded together. Gaseous molecule easily diffuse in air , since the intermolecular attraction is very less in them.

In solid state molecules are densely packed and difficult to move apart. In liquid state , particles have some space to move and in gases molecules are far apart due to less intermolecular force.

As the gas molecules in air absorbs heat energy, they overcome all the intermolecular forces and will spread out in the air. Thus, they rises above over a temperature gradient.

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The Sun is a close second in terms of object radii. It would be so spherical if shrunk to the size of a beach ball that the distance between its widest and narrowest diameters would be significantly smaller than the width of a human hair.

Our world is greatly influenced by the sun, which controls the weather, ocean currents, seasons, and climate as well as enabling plant life through photosynthesis. Life on Earth would not live without the heat and light provided by the sun.

Because they developed and collapsed under the force of their own gravity, the Sun and the majority of other big objects in space, including stars, planets, and large moons, are spherical. When our Solar System first formed, it was a massive, whirling cloud of gas and dust that gradually shrank due to gravity.

Thus, The Sun is a close second in terms of object radii.

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From 5.5 grammes of sodium fluoride, 4.1 grammes of magnesium fluoride will be created. The inorganic substance MgF2 stands for magnesium fluoride.

It naturally occurs as the rare mineral sellaite and is a white crystalline salt that is transparent over a broad range of wavelengths and has commercial use in optics used in space telescopes. With the formula NaF, sodium fluoride (NaF) is an inorganic substance. It is utilised in minute quantities in toothpaste, metallurgy, and as a flux in addition to fluoridating drinking water. It is a white or colourless substance that easily dissolves in water. Pharmaceutical manufacturers frequently use it as a source of fluoride. Mass in grammes is equal to 0.06548 times 62.301 grammes of MgF2.

= 0.06548 /62.301 = 4.1grams

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Answer:

because it's water chemical bonds form when atoms share electrons and example of a chemical compound is water a water molecule forms when oxygen and hydrogen atoms react and are held together by covalent bonds like other compounds water always has the same chemical composition a ratio of two one of hydrogen atoms to oxygen atoms

The reason of why the chemical composition of water should be the same should be explained below.

Since it contain the water chemical bond at the time when the atom should share electrons.

And the example of the chemical compound represent the water that shows the water molecule created at the time when the oxygen and the hydrogen reacted and it could be together via the covalent bonds.

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Answer:

your answer is B, your graph is constant from there, therefore the pattern is uniform (orderely).

The pressure exerted by a 200 lb man wearing size 10 shoes, if the area of each shoe in contact with the floor is 20 square inches is about 5.77 Pa.

Pressure is the force exerted by unit area. Hence, as the force applied increases, pressure increases.

To calculate the pressure exerted by the man, we need to use the formula:

Pressure = Force / Area

where the force is the weight of the man, and the area is the total area of both shoes in contact with the floor.

First, we need to convert the weight of the man from pounds (lb) to Newtons (N), since the SI unit of force is the Newton. We can do this using the conversion factor:

1 lb = 4.44822 N

So, the weight of the man in Newtons is:

200 lb x (4.44822 N/lb) = 896.44 N

Next, we need to calculate the total area of both shoes in contact with the floor. Since the man is wearing size 10 shoes, we can estimate the area of each shoe to be:

Area per shoe = πr^2 = π(5 in)^2 = 78.54 in^2

So, the total area of both shoes in contact with the floor is:

Total area = 2 x 78.54 in² = 157.08 in²

Now we can calculate the pressure exerted by the man:

Pressure = Force / Area = 896.44 N / 157.08 in²

We need to convert the units of area from square inches (in²) to square meters (m²), since the SI unit of pressure is the Pascal (Pa) and 1 Pa = 1 N/m²:

Pressure = (896.44 N / 157.08 in^2) x (1 m^2 / 1550 in^2) = 5.77 Pa

Therefore, the pressure exerted by the man is approximately 5.77 Pa.

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Magnesium sulfate, or MgSO₄, weighs 6.68 g, and dissolves about 0. 965 L of the a 0. 0575 M solutions.

A solution is created when a solvent and a solute, two different compounds, are mixed together. When a salt and a solvents is mixed, a solution is created. Commonly, one substance will dissolve in another to create a solution, such as when salt dissolves in water. Nevertheless, a solution can be produced under any state of matter.

Molar mass MgSO₄ = 120.36 g/mol

You have a 0.0575 M solution

That is equal to 6.9207 g/L or 0.0575 mol/L * 120.36 g/mol.

But you want mass in 0.965 L

Mass equals 0.965 L times 6.9207 g/L, or 6.68 g.

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Answer:

h2o,H,O are some of the elements

The ions will combine to form a salt are Cl- and Cs+ when Hydrochloric acid (HCl) is combined with cesium hydroxide (CsOH) in a neutralization reaction.

HCl + CsOH --> CsCl + H2O

Cesium chloride is the salt that results from the neutralization of hydrochloric acid with cesium hydroxide. Because both of the bonds in salt compounds the positively charged cesium ion and the negatively charged chloride ion have electrical charges, they are referred to as ionic bonds. A neutralization reaction occurs when an acid and a base combine to form salt and water in an aqueous solution. A salt is the name for the aqueous cesium chloride that is created during the process.

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Answer:

b) energy can accomplish work

Explanation:

A fossil that has 6.25% of its carbon atoms is still unstable.

Carbon-14 dating is a method of determining the age of organic material. Measures the amount of carbon-14 (a radioactive isotope of carbon) present in the sample. The half-life of carbon-14 is 5,730 years. This means that after 5,730 years, half of the carbon-14 atoms in the sample have decayed to nitrogen.

If 6.25% of the fossil carbon atoms are unstable, this means that 93.75% of the carbon-14 atoms in the sample have already decayed. To determine the age of a fossil, the following formula can be used:

Age = (half-life x ln(1-(fraction of decayed carbon-14/100))) / ln(2)

Age = ( 5,730 x ln(1 - (93.75/100))) / ln(2)

age = 11,460 years old

c. A fossil in which 75% of the atoms are STABLE.

If 75% of the fossil atoms are STABLE, this means that 25% of the carbon-14 atoms in the sample have decayed. The same formula as above can be used to determine the fossil age. 75 )) / ln(2)

Age = 23,120 years

Please note that these are approximate values, as the actual age of the fossils may be affected by various factors such as contamination, preservation, and measurement error.

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Answer:

400.58

Explanation:

Standard pressure is 1atm/760 mm Hg

760-359.42= 400.58

Answer:

according to the Oxford dictionary, metallurgy the branch of science and technology concerned with the properties of metals and their production and purification

Explanation:

Explanation:

The entire scientific and technological process used for isolation of the metal from its ores is known as metallurgy.

Hey stan.

Hope it's help ^_^

108°C is the final temperature of the water after absorption of 1680 Joules of heat energy.

Temperature is a physical quantity used to measure the average kinetic energy of molecules in matter. This is measured with a thermometer or other device that measures the average kinetic energy of the molecules within the substance. The terms Celsius (°C), Fahrenheit (°F), or Kelvin are commonly used to describe temperature (K). Temperature can affect the physical state of matter.

By rearranging the equation gives:

ΔT = q/mc

Plugging in the given values,

ΔT = 1680/ (80.0 g × 4.184 J/g·C)

= 98°C.

Since the initial temperature was 10°C, the final temperature is:

ΔT = T₂ - T₁

98°C = T₂ - 10

T₂ = 108°C

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Answer:

correct answer is 0.165 moles by calculation