How many oxygen atoms are in 3.14 mol of NO2?


A.
1.89 x 1024


B.
3.78 x 1024


C.
3.31 x 10-24


D.
1.89 x 10-24

A student was instructed to list four facts that may be inferred from the equation presented.

A mg, what is it?

A milligramme is 1,000 micrograms and one tenths of a gramme. Typically, a milligramme is denoted by the symbol mg. A microgram is one tenths of a milligramme one and millionth of a gramme. It is frequently shortened to mcg or ug.

A microgram is what?

Micrograms are a measurement unit (ug or mcg). One thousandth of a gramme is equal to one microgram. Micrograms are used in nutrition to measure the minuscule amounts of nutrients that we require. Micrograms may be used to determine the nutritional value of substances like folate and b - complex.

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A cation is an ion that is generally positively charged and has more protons than electrons as a result of one or more electron losses.

Two charged atoms are produced when a neutral atom gives an electron to another neutral atom. At first, we have two neutral atoms, each of which has an electrical charge of zero. Because an electron has a charge of -1, if one of the two neutral atoms loses an electron, it becomes positively charged (charge: +1).The other atom that takes the electron consequently becomes negatively charged (charge: -1). We will ultimately have two charged atoms as a result. An atom will transform into an ion, a positively or negatively charged particle, when one or more of its electrons are lost or gained. Because there are fewer negatively charged electrons left to balance the positive charges of the protons in the nucleus, losing electrons causes atoms to gain a positive charge.

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The piece of information that is not correct is that the temperature of the reaction decreases since the reaction is exothermic.

The correct option is D.

An exothermic reaction is one in which energy is given off as heat or light. In contrast to an endothermic process, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.

In an exothermic reaction, the total energy content of the products is less than the total energy content of the reactants.

The given reaction below is an example of an exothermic reaction:

Mg (s) + CuSO₄ (aq) ---> MgSO₄ (aq) + Cu (s)

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Answer:

below

Explanation:

2.7 g   per 100 ml is th same as 27 g per liter

Molar weight of Na Cl

   Na = 22.99  g/mole     Cl = 35.45 g/mole      Total= 58.44 g/mole

then 27 g is    27/ 58.44 = .462 moles per liter

                                                      which is .462 molar

Answer:

Lead is a post transition metal of variable valency

Explanation:

Lead has been placed in group 1st and 2nd because lead chloride is slightly soluble in water and therefore, lead is never completely precipitated by adding dilute HCl to a sample; the rest of the lead ions are precipitated with H2​S in acidic medium.

Between sodium ethide (NaCH₂CH₃) or sodium methylamine (NaNH₂CH₂), the strongest base is sodium methylamine (NaNH₂CH₂).

sodium ethide (NaCH₂CH₃) and sodium methylamine (NaNH₂CH₂) are both sodium compounds with a basic nitrogen atom. However, sodium methylamine is a stronger base than sodium ethide because it has a nitrogen atom with a lone pair of electrons that can participate in protonation to form a cation.

This increases the basicity of the compound, allowing it to be a stronger base than sodium ethide. In addition, the nitrogen atom in sodium methylamine is bonded to two hydrogen atoms, making it more basic than sodium ethide, which only has one hydrogen atom bonded to its nitrogen atom.

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The new volume of the gas is 62.2 L

Charles's Law, also known as the Law of volumes, states that at a constant pressure, the volume of a gas is directly proportional to its absolute temperature. This means that as the temperature of a gas increases, its volume will also increase, and vice versa.

Mathematically, it can be expressed as: V/T = k, where V is the volume of the gas, T is its absolute temperature, and k is a constant.

We know that;

V1/T1 = V2/T2

V1T2 = V2T1

V2 = 60 * 313 /301.5

V2 = 62.2 L

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The alloy has a composition of 37 % zinc by mass and having a density of 8.48 g/cm. And a fitting composed of common brass has a total volume of 112.5 cm 3 ^3 3.

The number of atoms of zinc and copper should be  3.25 x 10^24 atoms and 5.70 x 10^24 atoms

Calculation of a number of atoms of copper and zinc:

Measure the mass of the alloy by multiplying the density and volume.

m = (8.48 g/cm³)(112.5 cm³) = 954 g

Now

The mass of zinc in this alloy is,

(954 g)(0.37) = 352.98 g

Now

mass of copper,

= 954 g - 352.98 g

= 601.02 g

Now

n (zinc) = 352.98 g / (65.38 g/mol) = 5.40 moles

n (copper) = 601.02 g / (63.55 g/mol) = 9.46 moles

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The mass of aluminum sulfate in kilograms is 35.85 kilograms.

To find the mass of aluminum sulfate required to produce 35.85 kilograms of lead (IV) sulfate, we need to balance the chemical equation for the reaction between aluminum sulfate and lead (IV) acetate:

Al₂(SO₄)₃ + 6 Pb(C₂H₃O₂)₄ → 3 Pb(SO₄)₂ + 2Al(C₂H₃O₂)₃

From this equation, we can see that 1 mole of aluminum sulfate reacts with 6 moles of lead (IV) acetate to produce 3 moles of lead (IV) sulfate. The molar mass of aluminum sulfate is 342.14 g/mol, so we can convert 35.85 kilograms of lead (IV) sulfate to moles and then find the equivalent amount of aluminum sulfate.

First, convert 35.85 kilograms of lead (IV) sulfate to grams: 35.85 kg x 1000 g/kg = 35,850 g

Next, find the number of moles of lead (IV) sulfate: 35,850 g / 247.2 g/mol = 144.9 moles

Since the ratio of moles of aluminum sulfate to moles of lead (IV) sulfate is 1:3, we need to divide the number of moles of lead (IV) sulfate by 3 to find the number of moles of aluminum sulfate: 144.9 moles / 3 = 48.3 moles

Finally, convert the number of moles of aluminum sulfate to grams and then to kilograms:

48.3 moles x 342.14 g/mol = 16,569.2 g

16,569.2 g / 1000 g/kg = 16.57 kg

So, 16.57 kilograms of aluminum sulfate are required to produce 35.85 kilograms of lead (IV) sulfate.

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The number of moles of hydrogen gas in 900 g can be calculated using the following formula:

To calculate the moles of a substance, you need to know the mass of the substance and the molar mass of the substance. The molar mass is the mass of one mole of the substance, and it is usually expressed in grams per mole (g/mol). To find the number of moles, you need to divide the mass of the substance, in grams, by the molar mass of the substance, in g/mol.

For example, if you have 900 g of hydrogen gas, with a molar mass of 2.02 g/mol, you can calculate the moles of hydrogen gas by dividing 900 g by 2.02 g/mol, which gives you 4.47 moles of hydrogen gas.

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Double bond in ethene is made up of sigma and Pi bonds.

The covalent bond will be formed by the lateral overlap of the atomic orbitals is known as pi bond. For example, ethylene molecule contain 5 sigma bonding as well as 1 pi bonding in it. Pi bond formation will takes place by the parallel orientation of the two p orbitals in an adjacent atoms by proper sideways overlap. Thus in any molecule in which pi bond formation will takes place at all the atoms must be having in the same plane. Thus in pi bond carbon carbon double bond rotation is restricted due to the maximum overlap of the p orbitals. Example : Ethene molecule

Sigma bond (σ bond): A covalent bond will be formed by the overlap of atomic orbitals and/or hybrid orbitals along with the bond axis (i.e., along a line connected to the two bonded atoms). The sigma bond in the hydrogen molecule is formed by overlap of a pair of 1s orbitals, one from each hydrogen atom.

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Answer:

What is the molar mass of CuCl₂? 134,4524 gr/mol

How many moles are in 79.8 grams of CuCl₂? 0,5935 moles of CuCl₂

Explanation:

Atomic weight of each element:

Cu = 63.546  *  1 = 63.546 gr/mol

Cl₂ = 35.4532 * 2 = 70,9064 gr/mol

The molar mass of CuCl₂ = 63.546 gr/mol + 70,9064 gr/mol

The molar mass of CuCl₂ = 134,4524 gr/mol

[tex]79.8\,grams\, \,of\, \,CuCl_2*\frac{1 mol\,CuCl_2}{134.4524\,grams\,\,of\,CuCl_2} \approx 0,5935\,\, mol \,of \,CuCl_2[/tex]

Answer: 52.69

Explanation:

The oxidation number in the reaction is: Sn₂⁺ = +2, Sn₄⁺ =  +4,  IO₄⁻ = +5. The reducing agent is Sn₂⁺, the oxidizing agent is IO₄⁻, the reduced species is Sn₂⁺, the oxidized species is IO₄⁻, the electron donor is Sn₂⁺, and the electron acceptor is IO₄⁻.

In this reaction, Sn₂⁺ is the reducing agent and IO₄⁻ is the oxidizing agent. The reducing agent (Sn₂⁺) donates electrons to the oxidizing agent (IO₄⁻), causing it to be reduced from +5 to -1 oxidation state.

The oxidizing agent gains the electrons, which causes it to become oxidized and its oxidation state increases. This reaction results in the transfer of electrons from the reducing agent to the oxidizing agent, with Sn₂⁺ losing electrons to become Sn₄⁺ and IO₄⁻ gaining electrons to become I⁻. The electron donor in the reaction is Sn₂⁺ and the electron acceptor is IO₄⁻. The reaction also results in the production of 4H₂O (water) and 8H⁺ (hydrogen ions).

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Explanation:

The temperature of the the fixed gas is451.938°C

Answer:

c

Explanation:

c

2.50 mL, 5.00 mL, and 7.50 mL of stock, each transferred into the volumetric flask and diluted to 10.00 mL. Option A

Step-by-Step approach:

The objective is to create a standard curve that represents the relationship between solution absorbance and dye concentration.

To create a standard curve, it is important to have a range of dilutions with different concentrations of the stock solution.

Option a) 2.50 mL, 5.00 mL, and 7.50 mL of stock, each transferred into the volumetric flask and diluted to 10.00 mL, provides a good range of dilutions.

This option allows for the creation of dilutions with different concentrations of the stock solution, which can then be plotted on the standard curve.

Option c) 3.00 mL and 5.00 mL of stock, each transferred into the volumetric flask and diluted to 10.00 mL, provides too limited of a range to create a useful standard curve.

Option b) 1.00 mL, 3.00 mL, 5.00 mL, and 7.00 mL of stock, each transferred into the volumetric flask and diluted to 10.00 mL, provides a good range of dilutions and is acceptable.

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The classification of each sample is pure element are shown in option A, C, and F, pure compound are shown in option D and I, mixture of an element and a compound are shown in option J, mixture of two elements are shown in option E and H, and mixture of two compounds are shown in option B and G.

Pure elements refer to substances that have one kind of atom. They have the same atomic number and one stable isotope as shown in the samples in option A, C, and F. A compound refers to a substance which is made up of two or more different chemical elements which are combined in a fixed ratio. A pure compound is composed of a particular set of molecules or ions that are chemically bonded as shown in the sample in option D and I.

Mixture comprises of two or more different elements and/or compounds which are physically intermingled. They can be separated into its components by physical means, and often retain many of the properties of its components. The mixture of an element and a compound are shown in option J, mixture of two elements are shown in option E and H, and mixture of two compounds are shown in option B and G.

Note: The question is incomplete. The complete question is attached.

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In a saturated solution of lead chloride, PbCl2, there are 0.072 mol/L of chloride ions. 1.86 x is the solubility product constant.

Sparingly soluble materials have a low degree of solubility. It is typically regarded as sparingly soluble if 1g of material dissolves in 30 to 100ml of solution. To put it another way, a substance is sparingly soluble if it can dissolve between 1 and 3g in 100ml of solute.

There are numerous exceptions to lead salts' solubility, including: While the majority of sulfates are soluble in cold water, lead sulfate is not. Cold water does not dissolve lead chloride either, but hot water does.

PbCl2 dissociates into [tex]Pb^{2+}[/tex] + [tex]2Cl^{-}[/tex]

Ksp = [[tex]Pb^{2+}[/tex]] [[tex]Cl^{-}[/tex]]²

Ksp = [x] [2x]²

Ksp = 4x³

Ksp = 4 x (0.072 x [tex]10^{-3}[/tex])³

ksp = 1.86 x [tex]10^{-4}[/tex]

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The given question is incomplete. The complete question is:

The chloride ion concentration in a saturated solution PbCl2 equals 0.072 mol/L. The solubility product constant equals

A-1.86x 10^-4

B- 4.6 10^-4

C- 1.49 10^-3

D-5.1 * 10^-3

Reagent bottles must be closed when not in use because they may contain volatile or sublime substances.

Reagent bottles are most commonly used to store chemical reagents, including acid and alkali solvents that can be safely stored due to anti-corrosion capabilities.

Reagent bottles, often known as graduated bottles, are glass, plastic, borosilicate, or related-substance containers with specific caps or stoppers. They are used in labs to store chemicals in liquid or powder form in cabinets or on shelves.

Some reagent bottles are tinted amber (actinic), brown or red to protect light-sensitive chemical compounds from visible light, ultraviolet and infrared radiation which may alter them; other bottles are tinted blue (cobalt glass) or uranium green for decorative purposes -mostly vintage apothecary sets.

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The standard enthalpy of formation of a compound is the enthalpy change associated with the reaction that generates 1 mole of that compound from its component elements under standard conditions.

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. The standard enthalpy change for any chemical reaction is equal to the sum of the standard enthalpies at which the products are formed less the sum of the standard enthalpies at which the reactants are formed.

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The number of people can be changed by reducing them in other to increase the sleigh's acceleration.

This is referred to as the rate at which velocity changes with time, in terms of both speed and direction and it is a vector quantity.

Fewer people would increase the sleigh's acceleration because more weight usually have a slower acceleration and light weight have a faster acceleration because of the high force which is needed to move the body thereby making it the correct choice.

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As 1  nanometer= 1×10[tex]^-9[/tex] m , thus 1.1×10[tex]^-10[/tex] m=1.1×10[tex]^-1[/tex] nm is the diameter of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

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Explanation:

Re-reading sections of the text or notes is a study habit, not one that is not a study habit for successful learning.

The addition of which compound will cause a shift in equilibrium because of a common ion effect is Na₂CO₃ which is therefore denoted as option D.

This is referred to as the condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.

The compound which has a common ion effect is Na₂CO₃ because when added to the solution, it is dissolved to produce Na⁺ and CO₃²⁻. This increases the concentration of CO₃²⁻ and the concentration of the products side, so the reaction will be shifted to the left side to suppress the increase in the concentration of CO₃²⁻.

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The full question is:

Consider the following system at equilibrium.

CaCO₃(s) = Ca²+(aq) + CO₃²-(aq)

The addition of which compound will cause a shift in equilibrium because of a common ion effect?

Al₂Cl₆ is an empirical formula

An empirical formula is a compound's chemical formula that only specifies the ratios of the elements it contains and not the precise number or arrangement of atoms.

Yes the given formula of Aluminum trichloride represented as Al₂Cl₆ is an empirical formula. An empirical formula represents the lowest whole number ratio of atoms in a molecular compound. In this case,

Al₂Cl₆ represents the simplest ratio of two aluminum atoms to six chlorine atoms.

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The chemist should pour out 1763.28 mL of a 0.386 M aqueous silver nitrate stock solution. By rounding to three digits, the answer is 1763 mL.

Molarity (M) is defined as the number of moles of solute (n) divided by the volume (V) of the solution in liters. The molarity of a solution determines the concentration of the solution. This is very relevant in the chemist's process of making drugs.

The equation corresponding to molarity and volume is

M1×V1=M2×V2

To find V1,

V1=(M2×V2)/M1

Putting in the values,

(140 mM 775 mL) / 0.386 M = V1.

V1 = 1763.28 mL

As a result, the chemist should measure out 1763 mL of silver nitrate stock solution.

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Because it is least ionic, CsI has the lowest melting point.

The temperature at which a substance transforms from a solid to a liquid is known as its melting point. The solid and liquid phases are in equilibrium at the melting point. Pressure affects a substance's melting point, which is typically reported at a standard pressure such 1 atmosphere or 100 kPa. Because it is least ionic, CsI has the lowest melting point. This is because its ionic nature is the weakest. Depending on the charge of the ions they are made of, ionic compounds typically have a high melting point. The cohesive forces and melting point increase with increasing charge levels. 

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Answer:

V2 = 2.485L

Explanation:

V1 = 1.98L

T1 = 242.5K

V2 = Final volume (What we're solving for)

T2 = 306.6K

V2 / T2 = V1 / T1

Where V1 is the initial volume, T1 is the initial temperature, V2 is the final volume and T2 is the final temperature.

So,

V2 = V1 * T2 / T1 ==> multiply both sides by T2 to isolate V2

V2 =

1.98L * 306.6K / 242.5K =

2.485 L

Hence, V2 = 2.485L

The partial pressure in mmHg and torr is 596.56 mmHg and 596.56 Torr.

The atmospheric pressure is the force per unit area exerted by the weight of the air. It is typically measured in units of the atmosphere (atm) or millimeters of mercury (mmHg).

In gases, each component (such as nitrogen, oxygen, etc.) has its own pressure within the mixture, known as its partial pressure. The total pressure of a mixture of gases is the sum of the partial pressures of each component.

The conversion factors from atm to mmHg and atm to Torr are:

1 atm = 760 mmHg

1 atm = 760 Torr

The partial pressure of nitrogen in the atmosphere is 0.781 atm, so the partial pressure in mmHg is:

0.781 atm * 760 mmHg/atm = 596.56 mmHg (rounded to 3 significant digits).

The partial pressure in Torr is:

0.781 atm * 760 Torr/atm = 596.56 Torr (rounded to 3 significant digits).

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Then density of the lead ball weighing 55 g is 11.4  g/cm³.Then the  volume of the ball is its mass divided by density equal to 4.82 cm³. Thus, volume in L is 0.004 L.

Density of a substance is the measure of its mass per unit volume. It describes how closely its particles are packed within a given volume. It is the ratio of mass to the volume.

Volume of an object is the space occupied by the object. For a rectangle block, volume is the product of length, width and height.

Given, M = 55 g

density =11.4 g/cm³

Volume =  55.0 g/11.4 g/ cm³

  =  4.82 cm³

1 ml = 1 cm³.

Therefore, 4.82 cm³ = 4.82 ml

Then volume in L = 4.82 /1000 = 0.004 L

Therefore, the volume of the ball in L  is 0.004 L.

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Your question is incomplete. The complete question probably was:

A lead ball has a mass of 55.0 grams and a density of 11.4 g/cm³. What is the volume of the ball in L?