help me out please and thank you

8.70 g of carbon dioxide are generated by the reaction of octane.

Let's compile all the data in one location since we are aware that we will require a balanced equation with masses and molar masses.

M_r:                    32.00      44.01

             2C₈H₁₈ + 25O₂ ⟶ 16CO₂ + 18H₂O

  m/g:                    9.88

(a) Calculate the moles of O₂

n = 9.88 g O₂ ×1 mol O₂ /32.00 g O₂

n = 0.3088 mol O₂.

(b) Calculate the moles of CO₂

(16 mol CO2 to 25 mol O2) is the molar ratio.

n = 0.3088 mol O₂ × (16 mol CO₂/25 mol O₂)

n = 0.1976 mol CO₂

(c) Calculate the mass of CO₂

Mass of CO₂ = 0.1976 mol CO₂ × (44.01 g CO₂/1 mol CO₂)

Mass of CO₂ = 8.70 g CO₂

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Answer: 0.01175

Explanation:

The rate constant of the Decay of Radium with half life of 1620 years is 0.0004277/year.

We know, every radioactive reaction is a first order reaction.

So, it will follow the first order kinetics.

The half life of the radium sample is 1620 years.

We know, the standard formula for the half life of the first order reaction is,

T = 0.693/K

Where,

T is the half life of the reaction,

L is the rate constant of the reaction.

It is given that the half life of the reaction is 1620 years, so, putting all the values,

T = 0.693/K

K = 0.693/1620

K = 0.0004277/year.

So, the rate constant of the decay of radium is 0.0004277/year.

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Answer:

I catalyst promoter is the answer

Answer:

D. Density is defined as mass/volume.

Answer: The discovery of protons and isotopes

Explanation:  Mendeleev's arrangement by changing the criteria by which elements were arranged and assigned atomic numbers. Mendeleev arranged the periodic table based on the atomic mass of an atom of an element and its chemical properties.

The element that forms a yellowish gas, often used as a disinfectant, and forms a nasty gas with ammonia would be chlorine.

Chlorine is an element with a valence electron of 7. It forms a greenish-yellow gas that is 2 to 5 times denser than air. The element belongs to a group of elements on the periodic table known as halogen.

Chlorine is used as a disinfectant. It is utilized in the treatment of water for domestic use. It has the ability to kill harmful microbes off surfaces. It is also used in the manufacturing of textile products, paper bleaching, and several other industrial uses.

Chemically, chlorine is highly reactive. It reacts with ammonia to form a toxic gas known as chloramine. The gas affects the throat, lungs, and eyes of humans and in high doses, can cause outright death.

Thus, the element in question that form yellowish gas, is used as a disinfectant, and forms nasty gas with ammonia would be chlorine.

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The Vapour pressure of the solution is 99.56 torr

The saturated vapour pressure of the solution maybe lower then the pressure of pure solvent in solution. It is equal to the vapour pressure of the pure solvent at the same temperature scaled by mole fraction of solvent stated by Rault's Law.  

P(solution) = mol fraction of solvent × P° ( solvent)

given, pressure of pure toulene = 40.2 torr

pressure of pure cyclohexane = 125 torr

∴ P (solution) = 0.3 × 40.2 + 0.7 × 125

P (solution) = 99.56 torr

hence, vapour pressure is calculated to be 99.56 torr.

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The heating curve is a graphical representation of how various phases of substances change as temperature or heat increases. The graph's C section depicts the liquid phase of the substance gaining kinetic energy.

Kinetic energy is the energy that an object has as a result of its movement. If we want to accelerate an object, we must apply force to it. Using force requires us to put in effort. When the work is finished, energy is transferred to the object, and it moves at a new constant speed.

Therefore,

Section A represents the solid phase

Section B the solid-liquid phase

Section C the liquid phase

Section D the liquid-gas phase

Section E the gas phase

Section C of the graph depicts the substance's liquid phase gaining kinetic energy. Heat energy is absorbed during Phase C, and liquid particles gain kinetic energy to change into gas form in Section E.

As a result, C.C. is the correct answer.

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When sodium reacts with water, hydrogen gas evolves (option C).

A chemical reaction is a reaction that typically involves the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical reaction combines two or more substances called reactants to form new substances called products.

According to this question, sodium (Na) reacts with water (H2O) as follows:

2Na + 2H₂O → 2NaOH + H₂

As observed in the above chemical reaction, sodium metal reacts with water to produce sodium hydroxide and hydrogen gas.

Therefore, it can be said that hydrogen gas is evolved when sodium combines chemically with water.

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          Since water served as the foundation for creating the metric system of measurement, density is defined as mass divided by volume (=m/v), meaning that one cubic centimeter (1cm3) of water weighs one gram (1g).

        The density of water is typically expressed in terms of grams per milliliter (1 g/ml) or grams per cubic centimeter (1 g/cm3).

85-milliliter outcome

2.988 Ounces

0.1868 Pounds

84.719 Grames

0.0847 Kilograms

Weight at 80°F(26.7°c)

         As the temperature drops, the water becomes denser. Water density reaches its maximum at 4 degrees Celsius.

        Like a solid, a liquid's density is determined by dividing its mass by its volume, or D = m/v. Water has an average density of one gram per cubic centimeter. No matter the size of the sample, a substance has a constant density.

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According to the given statement is 11.36 g/ml is the density of the object.

The proportion of an object's mass to its volume has been its density. The unit of density is frequently grams per cubic centimeter (g/cm3). Keep in mind that the volume is measured in cubic centimeters, not grams (the same volume as 1 millilitre). More particles will make a box denser than fewer particles in the same box.

Absolute density and relative density are the two main types of density. Relative density, also known as specific gravity, is the proportion of a product's density to the density of a reference material.

Mass  = 125  g

Initial Volume =55.0 mL

Final  Volume = 66.0 mL

Volume = 66.0mL - 55.0mL

Volume= 11.0 mL

ρ = m/v

ρ = 125/11

ρ = 11.36 g/ml.

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If a 28.00 gram sample containing 22.90 grams carbon and 5.10 grams hydrogen , then the empirical formula is CH3 .

The empirical formula, which is defined as the ratio of subscripts of the least whole number of the elements present in the formula, is the simplest formula for a compound. The simplest formula is another name for it.

The formula of a material expressed with the smallest integer subscript is referred to as an empirical formula for a compound.

The empirical formula provides details regarding the ratio of atom counts in the molecule. A compound's % composition directly determines its empirical formula.

Given ,

the mass of the sample of hydrogen and oxygen is 28g .

the mass of carbon in that sample is 22.9g

the mass of hydrogen in that sample is 5.1g

We know ,

the molecular mass of carbon is 12g

thus , 12g of carbon contains 1 mol

22.9g of carbon contains 22.9/12 = 1.9mol

the molecular mass of hydrogen is 1g

1g of hydrogen contains 1mol

5.1g of hydrogen contains 5.1mol

now , the mole ratio of carbon to hydrogen is

= C:H = 1.9/5.1 = 0.37 = 1:3

Hence , the empirical formula is CH3 .

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The difference between the first and second ionization energy of an element is second ionization energy is larger than first ionization energy.

Ionization energy is the energy required to remove the electron . First ionization energy is the amount of energy required to remove the electron from neutral atom such as M. while second ionization energy is the amount of energy required to remove electron from positively charged ion such as M⁺.

first ionization energy is given as :

M --->   M⁺  +    e⁻    ,  IE1

second ionization energy is given as :

M⁺    ---->    M²⁺    +     e⁻   ,  IE2

Thus,  The difference between the first and second ionization energy of an element is second ionization energy is larger than first ionization energy.

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Answer: A supersaturated

1. The longer distance for each choice is:

2. The complete statements are as follows;

3. The basic unit of length in the metric system is the meter and is represented by a lowercase m.

4. The meter is defined as the distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.

5. The values that complete each statement is given below:

6. The larger value for each option is:

7. The number of millimeters in 1 centimeter is 10 mm

8. Using the ruler and line, the answers are:

The unit for measuring distance in the metric system is the meter. Smaller and larger values of the meter are also used such as millimeters, centimeters, kilometers, etc.

Other units for measuring distance include yards, miles, and inches.

The various units for measuring distance can also be interconverted using their conversion factors.

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Flammable liquids and solids, such as lighter refills, lighter fuel, matches, paints, thinners, fire-lighters, lighters that must be inverted before ignition, matches (these may be carried on the person), radioactive material, briefcases, and attach cases with alarm devices installed.

Food items larger than 3.4 oz are not permitted in carry-on bags and should be stored in checked bags if possible. Food, powders, and other materials that can clog bags and obstruct clear images on the X-ray machine may be instructed to be separated from carry-on bags by TSA officers. Most passengers are permitted to bring one full-size carry-on bag and one personal item for free on their flight. There are some exceptions, such as customers traveling on Basic Economy tickets.

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Answer:

Explanation:

Boyle's law was used when a traveller on a plane packed a bag of potato chips in his checked luggage and put it in the unventilated baggage hold. When the passenger opened the bag after landing, the bag exploded, and there were chips all over his luggage.

Why is Boyle’s law applicable to the airplane passenger?

Let's have a look at the link between pressure and height to better understand how the answer was arrived at.

Altitude increases cause a drop in pressure.

A particular surface has fewer air molecules above it at higher elevations than it does at lower elevations.

This indicates that the pressure is high at ground level and low at the airspace through which an airplane passes.

The gas in the sealed bag of potato chips had expanded, causing the bag to explode.

Given that it demonstrates the relationship between volume and pressure, this circumstance serves as an illustration of Boyle's law.

Basically, Boyle's law states that when pressure lowers, volume rises and vice versa.

What does Boyle’s law state?

If the temperature and amount of gas remain constant in a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies.

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25 ml of the solution contains 4.83 x 10⁻⁴ moles of CaCl₂.

Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.

The concentration of the CaCl₂ solution is 0.0193 M.

Hence, there are 0.0193 moles of CaCl₂ per liter of the solution.

M = 0.0193 M

volume of solution = 25 ml

Multiply the volume by the concentration to get the number of moles.

M = moles of solute / volume of solution

moles of solute = M (volume of solution)

moles of solute = 0.0193 M(25 ml)(1 L / 1000 ml)

moles of solute = 4.83 x 10⁻⁴

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Answer:

The d  block elements differ from the main group elements in the nature of the ions that they form. Also, the group number is related to the number of electrons in the valence sell of an atom.

The D block elements are those elements that are found to have d orbitals as the orbitals that has the highest energy in the atom. The d block elements are called the transition metals and they have an incompletely filled d - level.

Owing to the fact that d - level is incompletely filled they do exhibit variable oxidation states and are colored. On the other hand, the main group elements do not exhibit a variable oxidation states and the ions that they form are not colored.

Secondly, for each of the main group elements, the group number shows the number of valence electrons that are present in the outermost shell of the atoms in the elements of the groups.

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The number of atoms of hydrogen contained in the molecular formula of the compound is 6 atoms

We'll begin by obtaining the formula of the compound. This can be obtained as follow:

Divide by their molar mass

C = 92.3 / 12 = 7.7

H = 7.7 / 1 = 7.7

Divide by the smallest

C = 7.7 / 7.7 = 1

H = 7.7 / 7.7 = 1

Thus, the empirical formula of the compound is CH

Finally, we shall determin the number of atoms of hydrogen present in the compound. This can obtained as follow:

When 1 atom of carbon was present, 1 atom of hydrogen was also present.

Therefore,

When 6 atoms of carbon is present, then 6 atoms of hydrogen are also present.

Thus, we can conclude that the number of atoms of hydrogen is 6 atoms

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Possible monobromination products of butane are 3.

Monobromination as defined by medicine:

an organic molecule is given one bromine atom by the addition process.

In a chemical process known as bromination, a compound is subjected to bromination, which adds bromine to the substance. Following bromination, the result will possess traits distinct from the initial reactant.

Any reaction or process known as bromination entails the introduction of bromine into a molecule alone. Alkene bromination with the electrophilic addition of Br₂. electrophilic aromatic substitution-based bromination of a benzene ring. Benzylic position bromination using a free radical substitution process.

By way of the reaction, a total of three monobrominated compounds will be produced.

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Formula units are there in 212 grams of MgCl₂ are 830.56

Formula is the empirical of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations and it is the lowest whole number ratio of ions represented in an ionic compound

Here given data is

MgCl₂ = 212 grams

1 mole of magnesium chloride has mass = 95.211 gram and contains 6.022×10²³formula units of magnesium chloride

Here 212 grams×6.022×10²³form unit of MgCl₂/95.211 gram = 830.56

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An atom's Lewis structure enables you to predict its bonding patterns and number of bonds. We may ultimately be able to comprehend the structures of molecules & their chemical characteristics using this information.

2. The stability of the molecule increases with the number of charges on each element. In order to reduce the number of different formal charges, a double or triple bond should be applied.

3. Dots are used in the Lewis structure to depict the shared electrons between atoms. Next, ascertain whether there is a single, triple, or triple covalent connection between the two atoms. Third, determine the radius of each of the bonded ions based on the type of bond by using an atom radius chart.

4. By considering each bond as if one-half of the electrons were allocated to each atom in a Lewis structure, formal charges can be ascribed to each atom. These fictitious formal charges serve as a reference for selecting the best Lewis structure.

5. N-O bond as well as a double bond. The N atom possesses a positive charge and an unpaired electron. They are the two principal resonance sources of NO2.

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The final volume of the ideal gas in a flexible container will be 9.0 L.

Let:

Ideal-gas Equation establishes a relation between pressures, volumes, and temperatures of different conditions.

Using the Ideal-Gas Equation:

                              PV = nRT

Ideal-Gas Equation for initial conditions will be:

                              PV = nRT.....................................................(i)

Ideal-Gas Equation for final conditions will be:

                              (P/3)X = nR(T/2)........................................(ii)

On dividing equations (i) and (ii):

                             PV = nRT / (P/3)X = nR(T/2)

                             3V/X = 2

                             X = 3V/2

Putting the value of V = 6L:

                             X = 3(6L)/2 = 9L

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The pH of a strontium hydroxide was obtained by dissolving 0.17 grams of strontium hydroxide in enough water to obtain 670. ml of solution is 3.6.

The range of pH goes from 0 to 14, with 7 acting as neutral. A pH value of 7 or less denotes acidity, while a pH value of 7 or more denotes baseness. The amount of free hydrogen and hydroxyl ions present in the solution is what determines the pH of water.

Molarity of strontium hydroxide = mass/volume

Molarity of strontium hydroxide = 0.17/670

Molarity of strontium hydroxide = 0.000253 = 2.53 × 10⁻⁴

pH = - log [strontium hydroxide]

pH = -log [2.53 × 10⁻⁴]

pH = 3.59

pH = 3.6

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The number of protons in lithium is 3, in sodium is 11 and in potassium is 19 whereas the mass number of lithium is 6.941 u, the mass number of sodium is 22.989769 u and the mass number of potassium is 39.0983 u.

Numbers of Protons:

The total number of protons in lithium is 3.

The total number of protons in sodium is 11.

The total number of protons in potassium is 19.

Mass Number:

The mass number of lithium is 6.941 u.

The mass number of sodium is 22.989769 u.

The mass number of potassium is 39.0983 u.

Structure of Lithium and Potassium:

Lithium and potassium have a similarity in them that they all have one electron in their outermost orbit.

Structure of Sodium and Potassium:

Sodium and potassium have a similarity in them that they all have one electron in their outermost orbit.

So we can conclude that the number of protons in lithium is 3, in sodium is 11 and in potassium is 19.

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In Niger State, Nigeria, there is a deposit of clay similar to kaolin that has a lot of promise for use in pollution control processes including wastewater treatment.

This study looks into the ideal settings for Kpautagi clay modification for use in treating the effluent from refineries. The clay was modified using sulphuric acid, and the modification factors taken into account were acid concentration, activation time, and temperature.

The sulphuric acid-modified Kpautagi clay was used in the treatment of refinery wastewater in column mode at a fixed flow rate and mass of adsorbent to establish the best conditions for the modification variables.

The results show that 4M acid concentration, 120min of activation time, and 100°C activation temperature are the best conditions for modifying Kpautagi clay for use in the treatment of petroleum refinery wastewater.

As a result, the best conditions discovered in this work for Kpautagi clay modification could be used to treat wastewater from petroleum refineries more effectively.

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Answer:

Quickly

Explanation:

Answer:

Atomic mass of Boron: 10.8 amu

Explanation:

Boron-10: (0.198)(10.013) = 1.98 amu

Boron-11: (0.802)(11.009) =  8.83 amu

Add them up: 1.98+8.83= 10.8 amu