2CO(g) + O2(g) = 2CO2(g)
If 6.0 L of CO reacts at STP, how many liters of oxygen are required for the reaction?

There are approximately 6.02 × 10²³ atoms of phosphorus in one mole of 30.974 grams of phosphorus (option A).

The number of atoms of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number. That is;

no of atoms = no of moles × 6.02 × 10²³

According to this question, there are 30.974 grams of phosphorus in one mole of phosphorus. The number of atoms can be calculated as follows:

no of moles of P = 30.974g ÷ 31g/mol = 0.99mol

number of atoms = 0.99 mol × 6.02 × 10²³

number of atoms = 6.02 × 10²³ atoms

Therefore, there are approximately 6.02 × 10²³ atoms of phosphorus in one mole of 30.974 grams of phosphorus.

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The sketch of two amino acid side by side is given above.

Amino acid is defined as the acid which contains two functional groups which are carboxylic group, -COOH and ammine group, -NH2.

When the two or more than two molecules of amino acids join together by forming peptide bond, they produces polypeptide chain or protein.

The bond which is present inbetween two amino acid is called a peptide bond.

The peptide bond is defined as a chemical bond which is formed inbetween the two or more molecules when nitrogen which is present in one amino acid react with the carbon of another amino acid by releasing a molecules of water.

Thus we concluded that the two amino acid bond by forming peptide bond.

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Answer:

6.34917360^25g

Explanation:

It's been a while since I've done this type of problem so I'm not making any promises that its right hahaha, but I hope it helps anyway. Please let me know whether I'm right or not!

(a) 0.807 fraction of the sample will remain 3. 80 yr after its preparation of tritium.

Half life is the time taken for the radioactivity of a substance to fall to half its original value whereas mean life is average lifetime of all the nuclei of a particular unstable atomic species.

So if a radioactive element has a half life of one hour, this means that half of it will decay in one hour. After another hour, half of the remaining material will decay.

Example:

The radioactive isotope cobalt-60, which is used for radiotherapy, has, for example, a half-life of 5.26 years.

Tritium half life = 12.32 (T half)

Formula :

(a) 0.807 fraction of the sample will remain 3. 80 yr after its preparation of tritium.

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Answer:

82.4 s

Explanation:

Find the NUMBEr of half lives...then multiply by 54.3

2.27 = 6.5 (1/2)^n

log (2.27/6.5) / log (1/2) = n = 1.52 half lives

1.52 * 54.3 = 82.4 s

Answer: 4010 mol of iron atoms

Explanation:

Given Information

Iron Oxide = Fe₂O₃

Mass = 320 kg

Given atomic mass / molecular weight

Fe = 55.8 g / mol

O = 16.0 g / mol

Fe₂O₃ = 55.8 × 2 + 16.0 × 3 = 159.6 g / mol

Given formula

n = m / M

Convert the unit of mass to Gram

1 kg = 1000 g

320 kg = 320 × 1000 = 320 000 g

Substitute values into the given formula

n = m / M

n = (320000) / (159.6)

n ≈ 2005 mol of Fe₂O₃

Calculate the number of moles of Fe (Iron atoms)

Since each mole of Fe₂O₃ has 2 moles of Fe, then:

                                 2005 × 2 =[tex]\Large\boxed{4010~mol~of~Fe}[/tex]

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When removing nail wraps, it is recommended that when the client places her hand in the bowl of acetone, the acetone be about fully covered above the nail wraps.

Nail wraps, often known as nail paint strips, are nail improvements with printed patterns, glitter, or solid colors. Without the use of glue, they are attached to the nail in a flexible strip. There may be 12 to 22 various sized strips per box, depending on the manufacturer, which takes into account the range in size of each person's fingernail.

Nail wraps have a long history that dates back to the 1980s. The popularity of nail polish and the rise in salon visits gave rise to the demand for a better at-home manicure. Although several companies produced nail wraps and polish strips, it wasn't until the 2000s that they truly started to catch popularity. Since then, their appeal has increased.

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The temperature of the lab is assumed at 25°C while calculating Ksp. Pressure of the lab is assumed at 1 atm normal atmospheric conditions while calculating Ksp.

If we increase the temperature of the solvent, the average kinetic energies of the molecules start increases. Hence, the solvent is more able to dislodge more molecules from the surface of the solute. Thus, by increasing the temperature the solubilities of substances also increases. Temperature is directly proportional to the solubility.

As we goes on increasing the pressure of a gas, the collision between the molecules start increasing and thus the solubility goes up, as we decrease the pressure, the number of collision decreases thus solubility goes down.

Thus, with further increase in the temperature and pressure the Ksp value changes. Thus, temperature of the lab is assumed at 25°C while calculating Ksp. Pressure of the lab is must be 1 atm normal atmospheric conditions while calculating Ksp.

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Number of significant figures will be 1

Given:

weight of acetylsalicylic acid = 0. 4g

To Find:

significant figures

Solution: Significant figures are the digits of value which carry meaning towards the resolution of the measurement. They are also called significant figures in chemistry. All the experimental measurements have some kind of uncertainty associated with them.

When we convert 0.4g acetylsalicylic acid to mg we get value 400mg

when we convert 400mg to gram we get value of 0.4 gram

Since 0 before a decimal is not significant so there is only one significant figure that is 4

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Answer:

D

Explanation:

Gamma radiation penetrates the cell wall of prokaryotic organisms such as bacteria and can inhibit their metabolic functions as well as destroy their DNA.

Debunking the other answers:

A is incorrect as Gamma radiation is used in the treatment of cancer via radiotherapy.

B is incorrect as Gamma rays are too small and would just penetrate any smoke particles.

C is incorrect because Gamma rays are used to disinfect food products to prevent food borne illness. Irradiation is safe to use on food and does not make it radioactive.

Thus, D is correct.

Two properties are :

Bromcresol green is useful as an acidity indicator because it changes to yellow as the pH becomes more acidic

Also, the bromcresol green protons are easily dissociated making the color change visible and relatively quick.

Why is bromocresol green used as an indicator?

Bromocresol green (BCG) is a dye of the triphenyl methane family (triarylmethane dyes). It belongs to a class of dyes called sulfonephthaleins. It is used as a pH indicator in applications such as growth mediums for microorganisms and titrations.

How does a pH indicator work?

pH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves weak acids and bases. If an indicator is a weak acid and is colored and its conjugate base has a different color, deprotonation causes a color change.

What is chemical change and physical change?

Physical changes are reversible and do not produce a new substance. Chemical changes result in the production of a new substance and cannot be reversed.

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Toluene compound reacts third fastest with fuming sulfuric acid.

The reaction is attached in figure -

What is toluene?

What is a toluene used for?

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Answer:

Sodium hydroxide and water will react at room temperature. What does this indicate about its activation energy? The activation energy is at exactly 600 kJ. C. The activation energy is very low.

Explanation:

Formic acid (ch2o2)  on reaction with water undergoes dissociation reaction.

Formic acid  is the acid released by ant when it bites which causes us irritation.

It's formula is CH2O2 or HCOOH. and pH is 3.75.

In the case of dehydration, one hydrogen atom in the water molecule joins the hydroxyl group in the trans formic acid to form a new water molecule, while the hydrogen bonded to carbon in the acid breaks off to regenerate a water molecule.

Formic acid dissociates in water according to the equation:

HCOOH (aq) + H2O (l) = H3O + (aq) + HCOO- (aq)

Formic acid is the simplest carboxylic acid, containing a single carbon. Occurs naturally in various sources including the venom of bee and ant stings, and is a useful organic synthetic reagent. Principally used as a preservative and antibacterial agent in livestock feed.

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The conjugate acid is H2SeO4 and the conjugate base pairs in the reaction is H2O.

The full equation of the reaction is

H2SeO4 + H2O----- H3O^+(aq) + HSeO4

Conjugate base are those substance formed when an acid loses a hydrogen ion. Considered a base because it can gain a hydrogen ion to reform the acid.

The conjugate acid is the species that donate a proton to the conjugate base, hence H2SeO4 is the conjugate acid while H2O is the conjugate base because it accepts a proton from H2SeO4.

Thus we concluded that the conjugate acid is H2SeO4 and the conjugate base pairs in the reaction is H2O.

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Old and inefficient mining smokestacks contaminate the soil around abandoned mine sites.

A mine is an area from which natural resources are extracted such as coal, metals, etc. A mine is known to be the source of many heavy metals as well as acid.

As such the statement that does not represent the impact of mining services is that; "Old and inefficient mining smokestacks contaminate the soil around abandoned mine sites".

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The frequency of collisions between the two reactants increases as the concentration of the reactants increases. When collisions happen, they don't always cause a reaction (atoms misaligned or insufficient energy, etc.). Higher concentrations result in more collisions and reaction opportunities.

Increasing a reactant's surface area increases the frequency of collisions and thus the reaction rate. The surface area of several smaller particles is greater than that of a single large particle. The greater the available surface area for particles to collide, the faster the reaction will occur.

Thus, we can conclude that by increasing the concentration of Mg in the reaction mixture we increase the rate of collisions between the reactants in this reaction.

Iron gains electrons in the half reaction of an oxidation-reduction reaction. What does iron's electron gain mean? It has been reduced. Predict the product that will precipitate out of the reaction using the solubility rules and the periodic table.

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Answer:

1.1 atm

Explanation:

moles of neon =  10.0g /20.2g/mole =.495 mole

moles of ar      =  10.0 g /39.9 g/mole= .251 mole

the partial pressure of each is determined  by their mole fractions of the entire mix

Ne   .495 mole / (.495 + .251 mole)   * 1.6 atm =

      1.1 atm    ( to two significant figures)

The mass of copper releases 112.4 kj of heat as it freezes is 549 gm.

The most typical illustration is when solid ice transforms into liquid water. The molecules within in the substance become less structured as a result of this process, which is also known as melting or heat of fusion.

Calculation for mass of copper;

The heat of fusion for copper is given as 13.0 kj/mol.

Hfus(Cu) = 13.0 kJ/mol

The heat released during the process is  112.4 kj.

Q = 112.4 kJ;

The formula for molar heat of substance is;

Q = n(Cu) · Hfus(Cu).

Where n(Cu) is the number of moles of copper present in the solution.

Write formula in terms of Number of moles.

n(Cu) = Q / Hfus(Cu)

Substitute the given values;

n(Cu) = 112.4 kJ / 13.0 kJ/mol.

n(Cu) = 8.65 mol (number of moles of copper present)

m(Cu) = n(Cu) · M(Cu).

Where, m(Cu) is the mass of copper.

M(Cu) is the molecular mass of the copper.

Substitute the values in the formula to get the mass.

m(Cu) = 8.65 mol × 63.546 g/mol.

m(Cu) = 549.428 g

Therefore, the mass of copper present in the solution was 549.428 g.

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Answer: C.) 549 g

Explanation:

The substance that conducts electricity is [tex]NaCl[/tex] dissolved in water.

So, option A is correct one.

When the sodium chloride dissolve in water , the sodium atoms and chlorine atoms separates under the presence of water molecules and exist as sodium cation and chloride anion . Now , they are free to move around in the water as positively and negatively charged ions . This separation of charge allows the solution to conduct electricity.

The solid [tex]NaCl[/tex] and solid sugar does not conduct electricity because it is not dissolve in water . Similarly, sugar dissolved in water does not conduct electricity .

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If you have 200. 0 g of radioisotope with a half-life of 5 days. 25g of isotope would remain after 15 days

Isotopes are members of an element family that have the same number of protons but differ in the number of neutrons. The atomic number of an element on the Periodic Table is determined by the number of protons in its nucleus. Carbon, for example, has six protons and has atomic number 6.

Radioisotopes are elemental radioactive isotopes. They can alternatively be defined as atoms with an unstable neutron-proton combination or surplus energy in their nucleus.

Radioisotopes are critical components of medical diagnostic techniques. They can be utilized for imaging to examine the dynamic processes taking place in various sections of the body when combined with imaging devices that register the gamma rays emitted from within.

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An aqueous solution of hso−3 is created at 25∘c. is the solution basic in nature.

An aqueous solution is a solution wherein the solvent is water. Its miles are primarily shown in chemical equations by appending them to the relevant chemical formula.

An aqueous solution is a water that carries one or more dissolved materials. The dissolved substances in an aqueous answer can be solids, gases, or different beverages.

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At 25°C, an aqueous solution of hso3 is formed. This is the solution basic in nature.

Aqueous solutions are those in which the solvent is water. Its miles are often represented in chemical equations by attaching them to the appropriate chemical formula.

An aqueous solution is a mixture of water and one or more dissolved components. Solids, gases, or various beverages can be dissolved in an aqueous solution.

Aqueous solutions contain liquid water as the solvent. Solute (dissolved) ions and molecules are surrounded by water molecules and absorbed into the water's network of bonds. After then, the dissolved species diffused throughout the water.

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The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a Carboxyl group.

The carboxyl group is an organic functional group. Carboxyl group contains two functional groups that is carbonyl group (C = O) and hydroxyl group (OH) which attached with single carbon atom. The structural formula for carboxyl group is RCOOH where R is alkyl or aryl group.

Example of Carboxyl group: HCOOH (Methanoic Acid) , CH₃COOH (Ethanoic acid) etc.

Thus from the above conclusion we can say that The combination of a carbonyl group and a hydroxyl group on the same carbon atom is called a Carboxyl group.

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There are 4 different products will be formed from a poorly planned crossed aldol addition.

In a crossed aldol condensation, two distinct ketone and aldehyde reactants are used. Due to the possibility of several enolate nucleophiles as well as multiple carbonyl electrophiles, similar reactions typically result in a variety of distinct condensation products.

Ethanol and propanol undergo cross-aldol condensation, which results in two products:

Therefore, the correct answer will be option (d)

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There are four different products can be formed from a poorly planned crossed aldol addition.

So the correct option is D

Two distinct ketone and aldehyde reactants are used in a crossed condensation reaction. Due to presence of distinct ketone and aldehyde reactants there are possibility of formation of several enolate ion nucleophiles as well as multiple carbonyl electrophile .

Example : Ethanal and propanone undergoes cross-aldol condensation reaction and give results in two products.

First case: ethanal acts as enolate ion

Second case: propanone acts as enolate ion

Third case: when self condensation is also a product.

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The partial pressure of neon is 24.0498 atm.

To calculate the partial pressure of neon, we can use the ideal gas equation,

PV = nRT

Pne = nRT / V

Number of moles of neon = Mass of neon / Mass of one mole of neon

n = 20 / 20

n = 1 mole

R = 0.0821 L atm K-1 mol-1

T = 31.5 °C

T = 273.15 + 31.5

  = 304.65 K

V = 1040.0ml

Pne = 1 * 0.0821 * 304.65 / 1040.0 * 10-3

Pne = 24.0498 atm

The partial pressure of neon is 24.0498 atm.

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Magnesium (Mg) metal is the substance produced at the cathode.

As molten calcium bromide is electrolyzed, calcium (Ca) metal is the substance produced at the cathode.

Due to the fact that oxidation always takes place at the anode and reduction always occurs at the cathode,

Consider the two cations that were produced in the two ionisation processes of the two substances: mathrm Ca +2 and mathrm Mg +2. The following is how to express two cations' potential cathode reactions:

[tex]ca { }^{ + 2} + (aq) + 2e {}^{ - } - > \\ ca(s)E {}^{0} _{ca {}^{ + 2} \div ca } = - 2.87v[/tex]

[tex] Mg{ }^{ + 2} + (aq) + 2e {}^{ - } - > \\Mg(s)E {}^{0} _{Mg {}^{ + 2} \div Mg} = - 2.37v[/tex]

[tex] Mg^{ + 2} [/tex]

will be reduced quickly since it has a low electronegative electrode potential.

Thus, magnesium (Mg) metal is the substance produced at the cathode.

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The classification of whipped cream is a foam.

So, option C is correct one.

The whipped cream is a colloid and it consists of gas ( dispersed phase ) in liquid ( dispersed medium) system.

Sol is a solid dispersed in the liquid . Examples includes Au , S sol in water , milk of magnesia .

The emulsion is liquid dispersed into the liquid . Example is milk

Foam is a gas dispersed into the liquid . Examples includes whipped cream  , shaving cream , foam on the beer .

Gel is the liquid dispersed into the solid . Examples includes , butter , jellies .

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The mass or the weight of the substance is given as the product of moles and molar mass. The weight of CO as the same oxygen atom in carbon dioxide is 28 gm.

Mass of the substance has been given by the moles and the molar mass of the substance and also by the Avogadro's number (Na).

It is known that the molar mass of carbon dioxide is 44, and 1 mole of it will contain 44 gm or 6.022 × 10²³ molecules.

In a carbon dioxide molecule oxygen has 2 atoms so,

6.022 x 10²³ molecules of CO₂ = 2 × 6.022 x 10²³ atoms of Oxygen

so, 44g of carbon dioxide = 2 × 6.022 × 10²³ atoms of Oxygen

22 gm of carbon dioxide will also have 6.022 × 10²³ atoms of Oxygen

1 mole of carbon monoxide = 28 gm

So, 28 gm will have 6.022 × 10²³ atoms of Oxygen and will weigh 28 gm.

Therefore, the mass of carbon monoxide is 28 gm.

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Explanation:

1 mol of CO2=12+32=44 g

Number of oxygen in 1 molecule of CO2=2

Therefore, 44 g CO2 contains 2 moles of oxygen

22 g CO2 contains =442×22=1 mole oxygen atom

1 mole of CO=12+16=28 g

∴ 28 g CO contains 1 mol oxygen atom.

When 20. 0 g NH₃ and 50. 0 g O₂ are allowed to react, NH₃ is the limiting reagent.

Limiting reagent is defined as that reactant in a chemical reaction which is completely consumed in reaction.

Given,

Mass of NH₃ = 20 g

Mass of O₂ = 50 g

Molecular mass of NH₃ = 14 + 7 = 17 g

Molecular mass of O₂ = 2 × 16 = 32 g

Mole = given mass/ molecular mass

Mole of ammonia = 20/17

                             = 1.17 mole

Moles of O2 = 50/32

                    = 1.56 mole

Chemical equation:

4NH₃(g) + 3O₂(g)  ⟶ 2N₂(g) +6H₂O

From above reaction it is clear that 4 moles of NH₃ react with 3 moles of oxygen.

So, 1 mole of ammonia react with = 3/4 moles of O₂

                                                       = 0.75 moles of O₂

Also, 1.18 moles of ammonia react with

= 1.18 × 0.75

= 0.885 moles of O₂

Thus, from above we concluded that ammonia is completely consumed in reaction. Therefore ammonia is limiting reagent.

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Answer:

K2O2 and KO2 is the answer

Answer:

C.) K₂O

Explanation:

Potassium (K) always forms the cation K⁺.

Oxygen (O) always forms the anion O²⁻.

The ionic compound these two ions form must have an overall charge of 0. However, the dissimilar charges on the ions do not cancel out (+1 + (-2) = -1). Therefore, you need to have two K⁺ ions in the compound to balance the charges (+1 +1 + (-2) = 0).