2. 05 g of an unknown gas at stp fills a 500. Ml flask. What is the molar mass of the gas?.

For 56 g/mol of the compound, change in the internal energy is calculated to be -539 kJ/mol.

Calorimeter is a device that is used to calculate the amount of heat involved in a chemical or physical process.

As, ΔU = Heat of calorimeter + Heat of solution

And we know, Heat = heat capacity * temperature

Given, 0.485 g compound

Then, ΔU  = 3.81  0.285 + 4.184  3000  0.285

so, ΔU = 4.67 kJ

For 56 g/mol,

ΔU =  (energy/ mass) * (moles/1)

ΔU = (4.67/0.485) *56

ΔU = 539 kJ/mol

As there is a rise in temperature in the reaction, therefore the negative sign is given to the internal energy, i.e. -539kJ/mol.

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Rf will be 0.697

Retention factor can be defined as;

The ratio of  distance travelled by substance to the distance travelled by solvent. Substances start at the origin. The starting point of the compound is called the origin. This is where we measure the distance moved by the substance.

According to the question;

The given data is:

spot distance  =   9.9 cm

solvent distance =  14.2 cm

We will have to find the retention factor value:

Rf = ?

The formula to find Rf is as follows;

Rf = spot distance / solvent distance

Rf = 9.9 cm / 14.2 cm

The answer after the solution is :

Rf = 0.697

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Total random kinetic energy of all the molecules in one mole of hydrogen at temperature of 300 K is 3741.3 J. Speed with which a mole of hydrogen have to move so that kinetic energy of the mass is equal to the total random kinetic energy of its molecules is 7482.6 m/s

According to kinetic theory, average kinetic energy of gas molecules depends on the absolute temperature. At given temperature, molecules of all the gases have same average kinetic energy".

Kinetic energy = 3/2 * R T

= 3/2 * 8.314 * 300

= 3741.3 J

KE = 1/2 * m v²

v² =  2 KE/m

= 2* 3741.3 /1

Speed =  7482.6 m/s

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Along with the Aufbau principle and Hund's rule, the Pauli Exclusion principle is one of the key concepts governing the arrangement of electrons in an atom.

According to the Pauli exclusion principle, no two electrons may simultaneously hold the same set of quantum numbers or quantum states. A distinct quantum number and set of quantum states should exist for every electron.We learned from the definition of the Pauli exclusion principle that no two electrons with the same spin can be placed together at once, and no two electrons with the opposite spin can be ordered in a single quantum state. The Pauli exclusion principle is just as significant in chemistry as it is in physics.

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The Mo and W diatoms symbolize the greatest bond order attained between two atoms in the periodic table, which is six.

Bond order is the number of electron bonding pairs that exist between two atoms. A quadruple bond is a form of chemical relationship that involves eight electrons between two atoms. This bond is a variation on the more common double and triple bonds.

The number of bonds that an atom may make is frequently predicted by the number of electrons required to achieve an octet (eight valence electrons); this is notably true .

When three pairs of electrons come together, they create a triple bond.

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The balanced chemical equation for the reaction associated with the heat of formation for [tex]AgNO_{3}[/tex]

Decomposition is a type of chemical reaction when a single reactant breaks down into two or more different products. The term "thermal decomposition process" refers to the decomposition method used when heat is present.

The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation. A pure element has a standard enthalpy of production of 0 in its normal state.

Enthalpy of formation = Enthalpy change 1 mole of product formed from its original constituents.

[tex]Ag(s) + \frac{1}{2} N_{2}(g) + \frac{3}{2}O_{2} \rightarrow AgNO_{3}[/tex]

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The Entropy(ΔS) (water) is positive, and ΔS (surrounding) is negative, Water does evaporate, so the process is spontaneous, which means ΔS (universe) > 0 according to the Second Law of Thermodynamics.

What is Entropy (ΔS)?

The measure of a system's disorder is called entropy. It is a thermodynamic system's extensive attribute, which means that the amount of matter in the system affects how much it is worth. Entropy is typically represented in equations by the letter S and has units of joules per kelvin (J/K1) or (kg/m2/s2K1). Low entropy describes a highly ordered system.

What is the Second law of thermodynamics?

The entropy will either rise or stay the same in every cyclic process, according to the Second Law of Thermodynamics. Entropy, sometimes known as the "direction of time's arrow," provides information on how an isolated system evolves through time. If two separate pictures of the same system show one state that is more disordered than the other, it may be assumed that this state emerged later in time. In the case of an isolated system, the flow of events leads to a state where the system is more disordered or has the higher entropy.

Hence, ΔS (water) is positive, and ΔS (surrounding) is negative, Water does evaporate, so the process is spontaneous, which means ΔS (universe) > 0 according to the Second Law of Thermodynamics.

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350 cubic centimetres of dilute hydrochloric acid will be equivalent to 0.35 [tex]dm^3[/tex].

The problem here has to do with converting the volume of a liquid from cubic centimetres to [tex]dm^3[/tex].

Recall that:

1 centimetre = 0.1 dm

Thus:

1 cubic centimetre = 0.001 cubic decimetre or [tex]dm^3[/tex]

In this case, we are to convert 350 cubic centimetres to cubic decimetres.

If, 1 cubic centimetre = 0.001 cubic decimetre, then

350 cubic centimetres = 350 x 0.001

                                     = 0.35 [tex]dm^3[/tex]

In other words, 350 cubic centimetres of dilute hydrochloric acid would be equivalent to 0.35 [tex]dm^3[/tex] of the dilute acid.

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As the normal pH of blood is around 7.35, a lower pH of 7.20 is considered to be an indicator of acidosis.

For the normal metabolic function of the human body, the pH of the blood in the arteries is maintained between 7.35 and 7.45 through a complex feedback system between the various systems.

Acidosis occurs when an excess of Carbonic acid formed due to the reaction of carbon dioxide with water, is present in the body. The two main organs responsible for maintaining the pH are the kidneys and lungs. Even though a pH of 7.2 is normally considered alkaline, it is acidic relative to the normal pH of the blood.

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Answer:

c

Explanation:

english please im just guessing

404.14 grams of CO will be needed to produce 635 g of CO₂ in this scenario.

The stoichiometric coefficient is the number put in front of the atoms, ions, and molecules in a chemical reaction to balance the amount of each element on the reactant and product sides of the equation.

In most cases, it is favorable for products and unfavorable for reactants. The stoichiometry of a chemical reaction is determined by stoichiometric coefficients.

Let's start by obtaining the reaction's equation:

The given reaction: Fe₂O₃ + 3CO → 2Fe + 3CO₂

We can see from the equation that the mole ratio of CO to CO2

The mole ratio of CO to that of CO₂= 3:3

The mole ratio of CO to that of CO₂= 1:1

Given that,

635 g of CO₂ is to be generated.

Mole of 635 g CO₂ = mass/molar mass = 635/44.01 = 14.43 moles

Thus, the equivalent mole of CO required will also be 14.43 moles.

Mass of 14.43 moles of CO = moles x molar mass

Mass of 14.43 moles of CO = 14.43 x 28.01

Mass of 14.43 moles of CO = 404.14 gm.

To produce 635 g of CO2, 404.14 gm of CO will therefore be needed.

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The pH of a buffer in which  the concentration of HOCl is 6.50 x 10⁻⁴ M and that of  NaOClis 7.50 x 10⁻⁴ M( the ka of HOCl is 3.0 x 10⁻⁸) is 7.51.

We can find out the pH of the buffer solution by Henderson-Hasselbalch equation, derived by Lawrence Joseph Henderson and Karl Albert Hasselbalch. It is given as:

pH = pKa + log [A⁻] / [HA]

Here,

pH is the acidity of the solution

pKa is the negative logarithm of Ka (ionization constant of acid)

[A⁻]  is the concentration of salt/ conjugate base

and [HA] is the concentration of acid.

given,

concentration of NaOCl, [A⁻] = 7.50× 10⁻⁴ M

concentration of HOCl [HA] = 6.50 × 10⁻⁴ M

Ka of HOCl = 3.0 × 10⁻⁸

∵ pKa = -log(Ka)

pKa = -log(3.0 × 10⁻⁸)

pKa= 7.45

Putting these values in Henderson-Hasselbalch equation:

pH = 7.45 + log 7.50× 10⁻⁴ M/6.50 × 10⁻⁴ M

pH = 7.45 + log 7.50/6.50

pH = 7.45 + log 1.15

pH = 7.45 + 0.06

pH = 7.51

Thus,  the pH of the buffer is 7.51.

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The volume of the mixture is 5 L

The limiting reagent is the one that is completely consumed during a reaction. Reagents that are entirely consumed by a chemical reaction are known as limiting reagents. They are additionally known as limiting reactants or limiting agents.

Reactants in a chemical reaction are referred to as surplus reagents if they are still present at the end of the reaction. Because its quantity restricts the number of products that can be generated, the reagent that is totally consumed or reacted is known as the limiting reagent.

We should first use the mole ratio, and SO 2 as the limiting reagent .

That would yield 5.0 L or 2 moles of SO3, but that is not one of your options. Since the temperature and pressure are both constant, the volume is equal to the number of moles since n/v = p/rt.

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When pieces of two ionic compounds are exchanged, creating two new compounds, this reaction is known as a double replacement reaction (also known as a double displacement, exchange, or metathesis reaction).

What is Double Displacement Reaction?

When one reactant is partially replaced by another, the reaction is referred to as a twofold displacement reaction.

Double displacement reactions can be described as follows:

AD = CB + CD + AB

In a double replacement process, the ions in two reactant ionic compounds are exchanged for the same ions in two new product compounds.

When two reactants swap cations or anions to produce two new products, the process is known as a double replacement reaction.

Double displacement reactions and metathesis reactions are other names for double replacement processes.

Double replacement reactions include neutralisation, precipitation, and gas production.

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Iron(II) nitrate is an excess reactant left over is equal to 0.1265 mol.

A limiting reagent can be defined as a reactant that is completely finished from the reaction mixture at the completion of a  reaction and is also referred to as a limiting reactant.

Given, a balanced chemical equation of the reaction between iron(II) nitrate and potassium hydroxide is:

[tex]Fe(NO_3)_2 +2KOH\longrightarrow Fe(OH)_2 +2KNO_3[/tex]

Given, the amount of the iron(II) nitrate = 20.0 g

The molecular mass of the iron nitrate = 71.84 g/mol

The number of moles of iron(II) nitrate  = 20.0/71.84 = 0.278 mol

Given the mass of the potassium hydroxide, = 17.0 g

The number of moles of potassium hydroxide = 17/56.11 = 0.303 mol

If 2 mole of KOH react with  iron(II) nitrate = 1

0.303 mol of KOH react with iron(II) nitrate  = 0.303/2 = 0.1515 mol

Therefore,  iron(II) nitrate is an excess reagent.

The iron(II) nitrate is left after reaction = 0.278 - 0.1515 = 0.1265 mol

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The atomic number will be 12 and the element is magnesium.

What is electronic configuration?

Also called electronic structure ,it is the arrangement of electrons in orbits around the nucleus. The electron configuration of atoms in quantum mechanical models is given by ordering the occupied orbitals in order of packing, with the number of electrons in each orbital indicated as a superscript.

What is atomic number?

The atomic number, or atomic number of a chemical element, is the number of electric charges in the nucleus. For normal atomic nuclei, this equals the number of protons, or the number of protons found in the nucleus of each atom of that element.

Therefore, the atomic number will be 12 and the element is magnesium.

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A cholesterol test is a blood test that quantifies your blood's levels of cholesterol and certain fats. Every cell in your body, including the ones that make up your blood, contains cholesterol, a waxy, fatty-like substance.

Elevated blood ammonia (BUN) and creatinine are measured during kidney function testing, often known as renal panels. Aspartate analyzer (ALT), alkaline phosphatase (ALP), transaminase (AST), bilirubin, albumin, and total protein are all measured in liver function tests.

In patients suffering from viral infections or immunological disorders, scientific tests are particularly helpful in establishing a diagnoses, predicting clinical symptoms, and tracking disease progression. In the management of diseases, timely diagnostic evaluation and the use of accurate tests are crucial.

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The sample of water containing 0.004 ml of oxygen in 2000 ml of water is equivalent to 2× 10⁻⁴ volume percentage of the solution.

Volume percentage of an aqueous solution is the ratio of the  volume of the dissolved substance to the total volume of the solution. Volume percentage is thus, used to express the concentration of the solution in terms of its volume.

The other terms used to express the concentration of a solution are molarity, normality, mass percentage, ppm etc.

Given the total  volume of the water sample = 2000 ml

volume of oxygen dissolved in water = 0.004 ml

volume percentage = volume of oxygen / total volume ×100

                                 = 0.004 /2000 ×100 = 2× 10⁻⁴

Therefore, 2000 ml water sample containing 0.004 ml of sample is equivalent to 2× 10⁻⁴ volume percentage.

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The molar mass of the unknown gas is 100.4 g/mol

What is Molar mass?

Molar mass of argon = 39.95 g/mol

After filling with argon the flask gained 3.221 grams

After filling with an unknown gas, the flask gained 8.107 grams

The gas with the higher molar mass will have the higher density.

Ar - 3.224 g; molar mass = 39.95 g/mol

X = 8.102 g; molar mass = ??

Molar mass of the unknown gas = 8.102g X *(39.95 g/mol  / 3.224 g)

                                                    = 100.4 g/mol

The molar mass of the unknown gas is 100.4 g/mol

We all wish to know how many molecules are present in a given substance. Atoms and molecules are incredibly small in both size and mass. One sample mole's weight is the molar mass. To determine the molar mass, connect the atomic masses (atomic weights) of each atom in the molecule. Using the mass listed in the Periodic Table or Atomic Weight Table, determine the atomic mass for each element.

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Plugging in the given values gives m = 745.3 g.

Specific heat is the quantity of heat required to raise the temperature of a unit mass of a substance by one degree Celsius. It is measured in units of energy per unit mass per degree Celsius (J/ kg-K). The specific heat of a substance is determined by its physical and chemical properties. Typically, substances with higher specific heats require more energy to heat them up, meaning they are more resistant to changes in temperature. For example, water has a higher specific heat than most other substances, and therefore it takes a lot of energy to raise its temperature.

To find the mass of granite needed to store 150,000 J of heat, we need to use the formula for specific heat: q = m * c * ΔT. Rearranging this formula to solve for m gives m = q / (c * ΔT). Plugging in the given values gives m = 150,000 J / (800 J/g x °C * 15.5 °C) = 745.3 g.

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The partial pressure of He in the tank when total pressure is given is calculated as : 3.649 atm.

When a container is filled with more than one gas, then each gas exerts pressure. So , the pressure of any one gas within the container is called its partial pressure.

Given 40 g of N2 ; 50 gm of O2 and 10 g of He

Total pressure given 8 atm

Moles of O2 = 50/32

=1.56 moles

Moles of N2 = 40/28

= 1.42 moles

Moles of He = 10/4

= 2.5 moles

Total number of moles= 1.56 + 1.42 + 2.5

= 5.48 moles

= (2.5/5.48) * 8

Partial pressure of He =3.649 atm.

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Number of moles of carbon monoxide gas that were collected is 0.585 mol and the mass of carbon monoxide gas is 25.7 g

In an evacuated flask with a measured volume of 30.0L, carbon dioxide gas is collected at a temperature of 27.0 °C. The pressure within the flask is 0.480atm once all the gas has been collected.

Determine the volume and moles of the carbon dioxide gas that was gathered. Make sure you have the right number of significant digits in your response.

T = 27.0°C ˖ 273.15 = 300.2 K

V = 30.0 L

P = 0.480 atm

n = ?

m = ?

Determine the number of moles of CO₂

The ideal gas equation can be used to determine the moles of CO₂.

P×V = n×R×T

n= (P×V)/(R×T) = (0.480×30.0)/(0.08206×300.2) = 0.585 mol

Calculate the CO₂ mass.

The molar mass is calculated to be 44.01 g/mol.

0.585 × 44.01 = 25.7 g

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so the company hire company B because it pays not more than 85 cents.

Why would you not want to sell a cold pack made with compound x?

1. Technically it depends upon the temperature of your hand: if we assume the body temperature is 37 C then your hand is warmer than the beaker and the beaker will feel cold.

2. This is an endothermic reaction.

3.  If the beaker changes from 25 C to 5 C the energy is lower.

1.5g x (20/5) = 6.0 grams.

Cost of 6.0 g is

$184.04 x (6.0/1000) = about $1.10 each.

its cost = 110 cents

Compound B the same way.

1.0g x (20/2.5) = 8.0 grams.

Cost of 8.0 g is

$97.13 x (8.0/1000) = about $0.777 each.

its cost 77.7 cents.

so the company hire company B because it pays not more than 85 cents.

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A poor conductor of electricity is pure water. The electric conductivity of regular distilled water is around 10 times when it is in equilibrium with atmospheric carbon dioxide.

On the other hand, it was discovered that different types of water had significantly varying conductivities, which indicate the overall amount of dissolved solids. And as predicted, pure water had the lowest conductivity while carbonated water had the greatest.

When the graphene content is less than 2.0%, it is discovered that electrical conductivity increases with increasing carbonation depth. In this instance, the cement matrix, which can be improved by carbonation product through filling pores, determines the electrical conductivity of the composite.

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The mass defect in fe-56 is 0.528.

Binding energy  -  quantity of energy required to split a particle from a machine of debris or to disperse all of the debris of the system. Binding power is particularly applicable to subatomic debris in atomic nuclei, to electrons bound to nuclei in atoms, and to atoms and ions certain collectively in crystals.

Binding energy is the minimal quantity of electricity required to free an item from a sure machine and escape from its place of have an impact on (i.e. break out to infinity). inside the given case, it's miles the energy required through the satellite to depart its orbit around the earth and break out to infinity.

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SrCl₂ is soluble salt  to precipitate one cation while keeping the other cation in solution.

Cations are ions that are polarized. Anions are the name for negatively charged ions. Ions are charged atoms or molecules. If one or more of an atom's electrons are removed, it will transform from a balanced atom together into positive charges cation. If an unbalanced atom gains one or more electrons, it will transform into a negatively charged anion.

Due to mercurous, we can dilute any solution containing chloride ions to use as a NaCl solution.

Hg₂²⁺ is made up of group I cations that precipitated as chloride Sr²⁺ is from group V .

Net ionic equation:

Hg₂²⁺ + 2 Cl⁻  → Hg₂Cl₂

while SrCl₂ is soluble salt.

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The answer should go like...

Cube #1 to Cube #3

Cube #2 to Cube #1

Cube #2 to Cube #4

Cube #4 to Cube #3.