At stp, 1 mole of gas has a molar volume of 22.4 l. what is the density (g/l) of oxygen at stp?

Answer:

Oxygen and Carbon dioxide

The relative molecular mass of sodium trioxonitrate, NaNO₃ is 85 g/mol.

The molecular mass of a substance is the sum of all atomic masses of all atoms in a molecule. It is measured in Dalton.

The compound is NaNO₃ and the atomic mass of all atoms are given below:

Atomic Mass of sodium (Na) = 23 g

Atomic Mass of nitrogen (N) = 14 g

Atomic Mass of oxygen (O) = 16 g

Now add the atomic masses of atoms of the molecules:

Molecular mass of = 23 +14 +16(3) = 85 g/mol.

Thus, the relative molecular mass of sodium trioxonitrate is 85 g/mol.

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Moles = mass / molar mass

molar mass of retinol is 286.459 g/mol.

moles = 0.125/ 286.459

moles = 0.00043

A chemical compound's molar mass is calculated by dividing its mass by the amount of the compound present in the sample, which is given as the number of moles in the sample and measured in moles. A substance's molar mass is a bulk characteristic rather than a molecular one. The molar mass of the substance is an average over many samples, which frequently have varying values due to isotopes. The molar mass is most usually estimated using the standard atomic weights and is a function of the relative abundance of the isotopes of the constituent elements on Earth.

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Answer: 4.36x10^-4 mol

Explanation:

A buffered solution will resist changes in pH when small amounts of acid or base are added.

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Answer:

It is more active

Explanation:

This atom attracts all the elecrons of the atom forming energy levels in form of orbits

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When water (H₂O) melts and changes its state from ice to liquid is not a example of chemical reaction .it a example of physical change.

A chemical reaction is defined as when one or more substances (reactants) form a new substances ( product ).

When ice melts  and changes to water , there will be no new substances is form. water is made up of H₂O and ice is also made up of H₂O.  its just a change in the state , solid to liquid. Physical change are the change in which only physical properties of matter changes and no new substances is formed. so, in case of ice to liquid only the change in physical properties changes and physical change is a temporary change . we can turn water to ice by freezing.

Thus, When water (H₂O) melts and changes its state from ice to liquid is not a example of chemical reaction .it a example of physical change.

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I think it should be C. Cu and Ag since they are both in the same group of the periodic table, meaning that they have similar properties.

Inside of complex 1, fmnh2 transfers electrons to an fe/s complex. when this reaction occurs, FMNH, gets oxidized. So, the correct option is (c).

Either complex I or II is where electrons can enter the electron transport chain. The NADH, which is created in three processes of the citric acid cycle, is where these electrons originate from. As an illustration, consider the reaction in step 8 where NAD+ is reduced to NADH and L-malate is oxidized to oxaloacetate. Two hydrogen (H+) ions and two electrons are taken away from the substrate in the oxidation half-reaction.

The NAD+ molecule takes both of those electrons as well as one of the H+ ions during the reduction half-reaction. The inner mitochondrial membrane, the intermembrane space, and the other H+ ion are all traversed by the other H+ ion from the matrix. Through the matrix, NADH diffuses before being bound by complex I of the electron transport chain.

Complex I of the electron transport chain binds NADH as it diffuses across the matrix. The coenzyme flavin mononucleotide (FMN) in the complex takes both of NADH's electrons. By transferring the electrons, FMN is reduced to FMNH2 (reduced form of flavin) and NADH is oxidized back to NAD+.

Several proteins in Complex I have iron-sulfur (FeS) centers. These proteins are now receiving the electrons that were used to convert FMN to FMNH2.Two Fe-S centers are required to accept the two electrons required to regenerate FMN mononucleotide since each Fe-S center can only transmit one electron.

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6.701×10²¹moles of precipitate of iron hydroxide are formed.

Number of moles can be calculated using molar mass and Avogadro's number. The formula of which is,

number of moles=1/molar mass×Avogadro's constant

In the question given , by carrying out the reaction between iron nitrate and sodium hydroxide a precipitate of iron hydroxide is going to be formed.

The moles of iron hydroxide can be calculated by substituting the values in the formula,

1/89.86×6.022×10²³=6.701×10²¹ moles.

Hence,6.701×10²¹ moles of precipitate is formed.

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The % by mass of KCl in the original mixture is 40%

Given:

Mass of AgCl, m = 5.52g

Molar mass of AgCl, mm = 143.32g/mol

Mass of sample mixture, ms = 2.42g

Molar mass of KCl = 74.5513g/mol

To find:

Mass of KCl = ?

Formula:

Mass of KCl = no. of moles x molar mass

% = Mass of KCl / Mass of sample mixture x 100

Calculations:

n AgCl = 5.52 / 143.32 = 0.039 mols

Since Moles of AgCl = 1 mole from 1 mole of KCL and 2 moles from 1 mole of MgNO3

1 mole of KCl forms 1/3 mole of AgCl

Therefore,

No. of moles of AgCl formed from KCl = 1/3 x 0.039 = 0.013 mols

Mass of KCl = 0.013 x 74.5513 = 0.969g

% = 0.969 / 2.42 x 100 = 40%

Result:

The % by mass of KCl in the original mixture is 40%.

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95.6g I2 is produced by 2*150*95.6/254 g NaI = 112.91g of NaI.(sodium iodide)

What is sodium iodide?

A metal iodide salt with a Na (+) counterion is sodium iodide. It is an iodide salt and an inorganic sodium salt. A water-soluble ionic compound having a crystal lattice is sodium iodide. Although it can be used as a supplement for complete parenteral nutrition, sodium iodide is more frequently applied in veterinary medicine.

2*150 grams of Sodium Iodide NaI must be used to produce 254 g of Iodine I₂

For the formation of Iodine from NaI , the reaction is the follows:

2NaI(aq) + Cl₂ → I₂ + 2 NaCl

To calculate how many grams of NaI are needed to produce 95.6 g of Iodine, we use a conversion factor to go backward from grams of iodine to grams of sodium iodide.

Thus, 254g I2 is produced by 2*150 g NaI

95.6g I2 is produced by 2*150*95.6/254 g NaI = 112.91g of NaI.

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240L of 90% solution is used to make solution.

Let, the quantity of 75% antifreeze solution be x and 90% antifreeze solution be y.

360 is the total quantity of the mixture

x + y = 360                                        (1)

Also the final solution is 85% solution

75 % of x + 90% of y = 85% of 360

0.75x + 0.90y = 0.85 × 360

0.75x + 0.90y = 306

75x + 90y = 30600                            (2)

by solving equation 1 and 2 we get

15y = 3600

   y = 240

Therefore, 240L of 90% solution is used to make solution.

Any material that lowers water's freezing point is an antifreeze, and it works to prevent ice from forming and shield systems from its negative consequences. Radiators in car cooling systems are protected by antifreezes, including ethylene glycol or propylene glycol, which are frequently added to water.

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Answer:

240L of 90% solution is used to make solution.

Let, the quantity of 75% antifreeze solution be x and

90% antifreeze solution be y.

360 is the total quantity of the mixture

x + y = 360

(1)

Also the final solution is 85% solution

75% of x + 90% of y = 85% of 360

0.75x + 0.90y = 0.85 × 360

0.75x + 0.90y=306

75x + 90y = 30600

(2)

by solving equation 1 and 2 we get

15y = 3600

y=240

Therefore, 240L of 90% solution is used to make

solution.

antifreeze, and it works to prevent ice from forming

Any material that lowers water's freezing point is an and shield systems from its negative consequences. Radiators in car cooling systems are protected by antifreezes, including ethylene glycol or propylene glycol, which are frequently added to water.

Answer:

3:2:6

There's 3 Beryllium atoms, 2 Aluminum atoms, and 6 Trioxidosilicate atoms.

The ratio of atoms of each element in beryllium aluminium silicate, the ratio of Be: Al: Si:o : 3:2:6:18.

The building block of an element is an atom. An atom is a kind of stuff that cannot be further decomposed chemically. The three main components of an atom are protons, neutrons, plus electrons.

Some substances are either bigger or smaller than atoms. Examples of chemical species which are not commonly regarded as atoms include protons, neutrons, and electrons, which are atom-related particles.

Atoms make up molecules and compounds, however they are not actual atoms. The molecules and compounds salt, water, and methanol are examples of. Ions are the name for electrically charged atoms.  The ratio of atoms of each element in beryllium aluminium silicate, the ratio of Be: Al: Si:o : 3:2:6:18.

Therefore,  the ratio of Be: Al: Si:o : 3:2:6:18.

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For the reaction c2h6(g)=c2h4(g) h2(g) deltah= 137kj/mol and deltas= 120j/k. this reaction is spontaneous.

A spontaneous reaction is one that favours the creation of products under the reaction's current conditions.

A bonfire that is raging and exothermic is an illustration of a spontaneous reaction (there is a decrease in the energy of the system as energy is released to the surroundings as heat).

Exothermic reaction: This is a reaction when there is a decrease in the enthalpy.

At high temperatures, the reaction is spontaneous when both H and S are positive.

Let's take that back;

ΔG = ΔH - TΔS

Therefore, the reaction is spontaneous at high temperature when both H and S are positive.

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1. The number of mole of aluminum in each can is 2 moles

2. The number of molecules of aluminum that Darlene gave to the recycling guy altogether is 4.816×10²⁶ molecules

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

Mole = mass / molar mass

Mole of one Al can = 53.96 / 27

Mole of one Al can = 2 moles

From Avogadro's hypothesis,

1 mole of Al = 6.02×10²³ molecules

Therefore,

800 moles of Al = 800 × 6.02×10²³

800 moles of Al = 4.816×10²⁶ molecules

Thus, Darlene gave to the recycling guy a total of 4.816×10²⁶ molecules

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Lithium has 3 protons in the nucleus.

Atomic number =number of protons =number of electrons

According to the question,

we have been given atomic number= 3

So, number of protons will be 3 and number of electrons will also be 3.

We can additionally calculate number of neutrons as follows-

number of neutrons= mass number - number of protons

                                   = 6.941 - 3

                                   ≈ 4

Hence, the number of protons in lithium will be 3.

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The nucleus of Lithium has three protons.

The number of protons or electrons in the nucleus of a neutral atom is known as its Atomic number.

The total mass of an atom's protons and neutrons is known as its mass number. (neutrons and protons added together Equals nucleons)

Atomic mass= Mass number + Neutrons

Atomic number equals the sum of the protons and electrons

Since, atomic number given is 3

Therefore, protons in the nucleus will be 3.

Additionally, we may determine the neutron number using the formula below.

mass number = number of neutrons + number of protons

⇒ 6.941 = number of neutrons + 3

⇒ number of neutrons will be approximately 4.

Thus, lithium will contain three protons.

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The Sr-92 isotope, when bombarded with bismuth-209, would yield two neutrons and an isotope with atomic number 121 and mass number 299

When it comes to nuclear research, there are always new isotopes and elements being created. The Sr-92 isotope is one of the latest discoveries, and it has the potential to change the game when it comes to nuclear power.

When this isotope is bombarded with bismuth-209, it yields two neutrons and an isotope with an atomic number of 121 and a mass number of 299. This is a huge breakthrough because it could potentially be used to create a new form of nuclear power.

There is still a lot of research that needs to be done in order to make this a reality, but the potential is there. It will be interesting to see how this develops in the coming years.

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Molarity of isopropanol in the solution is found to be 0.0196M

The concentration of the solute in a solution is its molarity. It also goes by the name "molar concentration." The moles of solute per litre of solution is measured as molarity. The letter M serves as its symbol.

The amount of moles of solute in a kilogram of solvent is known as molality. The letter m stands for it.

Given:

Molecular mass of isopropanol, mm = 60.10g/mol

Molality, m = 10.01m

Density, d = 1.180g/ml

To find:

Molarity, M = ?

Formula:

M = (m x d) / 1 + (m x mm)

Calculations:

M = (10.01 x 1.180) / 1 + (10.01 x 60.10)

M = 11.8118 / 602.601

M = 0.0196M

Result:

The molarity of isopropanol in the aqueous solution is found to be 0.0196M.

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Answer:

.

Explanation:

Answer:

A and D is what I got hopes this helps

This molecule is called tert-butyl alcohol, also known as tert-butanol and 2-methyl-2-propanol (IUPAC nomenclature).

All carbon atoms are [tex]sp^{3}[/tex] hybridized. The oxygen atom has the same hybridization, with two of the orbitals being taken by the nonbonding electron pairs, and two by the C-O and the O-H bond.

Tert-butanol is a commonly used polar organic solvent, with a boiling point of 83 degrees Celsius and a density of 0.775 g/mL. Because it has an unusually high freezing point (26 degrees Celsius), pure tert-butanol is often solid at room temperature.
It is colorless, but has a characteristic camphorous smell, and is very miscible with water (dry tert-butanol is usually obtained through distillation over potassium or sodium).

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Density = 0.8104 g/ml

⇒ mass/volume = 0.8104 g in 1ml volume.

Number of moles = Mass (g) / Molar mass (g/mol)

⇒ No. of moles =0.8104/88.148 = 9.1936 x 10^-3 mole in 1 ml volume

So, in 2.66 ml of isopentyl alcohol,

No. of moles = 2.66 x 9.1936 x 10^-3 = 24.454976 x 10^-3 mole

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I gotta say it's D cause all of those all react differently towards another chemical.

The mass percentage of Cl⁻ in the solution produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is 1.86 %.

The total mass of the solution which is produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is determined as follows:

mass of CaCl₂ = 3.0 g

mass of water = density * volume

mass of water = 1.00 g/mL * 100.0 mL

mass of water = 100.0 g

mass of solution = (100.0 + 3.0) g

total mass of solution = 103.0 g

molar mass of CaCl₂ = (40 + 35.5 * 2) g/mol

molar mass of CaCl₂ = 111 g/mol

mass percentage of Cl⁻ in CaCl₂ = 71/111

mass of Cl⁻ present in 3.0 g of CaCl₂ = 71/111 * 3 = 1.92 g

mass percentage of Cl⁻ in the solution = 1.92/103 * 100%

mass percentage of Cl⁻ in the solution = 1.86 %

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The complete combustion reaction of the naphthalene is that Naphthalene+ oxygen → carbondioxide + water + energy

The complete combustion reaction of the naphthalene is given below;

Naphthalene+ oxygen → carbondioxide + water + energy

This reaction takes place and the reason behind this is that the naphthalene combustion involves a simple burning reaction in which the simple burning procedures are present.

Naphthalene also with oxygen will burn and in the result of which carbon dioxide and water will produce.

So we can conclude that the complete combustion reaction of the naphthalene is that Naphthalene+ oxygen → carbondioxide + water + energy.

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During winter in new york, the lower the temperature drops, the higher the demand for energy. this is an example of a negative relationship.

An inverse correlation that favors one partner at the expense of the other is referred to as a negative relationship. This may resemble codependency or other dysfunctional dynamics in which the needs of one spouse are not satisfied or even taken into account. Loss of trust, poor communication, lack of respect, a difference in priorities, and a lack of intimacy are the primary causes of negative relationships.

People who are in negative relationships are more likely to show signs of diminished confidence and self-worth. Additionally, it causes more self-doubt, helplessness, fear, worry, melancholy, insecurity, and paranoia, which lowers professional motivation and productivity.

Lower rates of anxiety and despair, more self-esteem, more empathy, and closer relationships are all examples of correlations that have been demonstrated in negative relationships. Your immune system can be boosted by having healthy connections, and they can also aid in your recovery from illness.

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