What is the atomic radius of Br?

84pm
140pm
60pm
117pm

Avogadro's constant is the same as the number of copper II sulfate formula units in 160g of copper II sulfate; option C.

Avogadro's constant is a number that describes the number of particles in 1 mole of a substance.

The value of the Avogadro constant is 6.02 * 10²³.

The carbon-12 isotope is used as the standard to define the mole of a substance.

12 grams of the carbon-12 isotope contains the Avogadro number of particles which is equal to 6.02 * 10²³.

Hence, 1 mole of a substance is defined as the amount of a substance that contains as many elementary particles as there are in 12 grams of carbo-12.

Considering the given substances:

a. 24g of magnesium off magnesium contains two moles of magnesium atoms.

b. 14g of nitrogen gas contains 0.5 moles of nitrogen gas molecules

c. 160g of copper (ii) sulfate contains 1 mole of copper (ii) sulfate formula units. Hence, this is equal to the  Avogadro constant

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Answer:

0.40 mole of A

Explanation:

1 mole of A to produce 2 moles of C

so the number of mole of A to produce 0.80 mole of C is:

(0.80 x 1)/(2) = 0.40 mole

From the Henderson- Hasselbalch equation, the pH of a solution is 3.36.

The pH of a solution made from a weak acid and its conjugate base can be calculated using the Henderson- Hasselbalch equation.

The Henderson- Hasselbalch equation is given below as follows:

where;

pKa of HF = 3.8

[A⁻] = 0.21 M

[HA] = 0.57 M

pH = 3.8 + log (0.21/0.57)

pH = 3.36

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Answer:

The answer is if a solid gets dissolved in a liquid then sedimentation and decantation cannot be used because these methods are used to separate an insoluble solid substance but if we add a little sugar or salt it will dissolve in the liquids it is soluble solid making it hard to separate.

Explanation:

I hope this helps

The mass percentage of HCl 11,900x/118 g and molality of solution is   9.915 mol L^-1.

Molarity = 11.8 M

Molarity = (moles of HCl) / (litres of solution)

Molality = (moles of HCl) / (kilograms of solvent)

=> Let number of moles of HCl present be x moles.

So, 11.8 = x/litres of solution

litres of solution = x/11.8 litres.

So, volume in mL = x/11.8 * 1000 mL =>10,000x/118 mL

Density of solution = 1.19 g/ml

So, D = m/v

Mass of solution = D * v => 1.19 * 10,000x/118 => 11,900x/118 g

=> (11,900x/118)/1000 L => 11.9x/118 litres

Moles of HCl = x moles.

Molality = x/( 11.9x/118)

=> 118x/11.9x => 118/11.9 => 9.9156 mol L-1

=> Molality of solution = 9.915 mol L-1 (approx.)

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Answer:

It is definitely friction

The specific heat of a 95.01 g piece of an unknown metal that exhibits a 45.2°C temperature change upon absorbing 1870 J of heat is 0.44J/g°C.

The specific heat capacity of a metal can be calculated using the following:

Q = mc∆T

Where;

According to this question, a 95.01 g piece of an unknown metal exhibits a 45.2°C temperature change upon absorbing 1870 J of heat. The specific heat capacity can be calculated as follows:

1870 = 95.01 × c × 45.2

1870 = 4294.452c

c = 0.44J/g°C

Therefore, 0.44J/g°C is the specific heat capacity of the metal.

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1. Baking cookies in the oven is an example of how energy is conserved.

2. Electrical energy is neither transformed nor transferred.

3. Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.

Baking is the process of cooking with dry heat, particularly in an oven. It is most likely the oldest type of cooking. Bakery goods including bread, rolls, cookies, pies, pastries, and muffins are typically made with flour or meal that comes from grains of some kind.

The stages of the ingredients originally start out in distinct states (e.g., flour is solid, eggs are liquid, etc.), and they change several times as the cookies bake. When they are combined to create cookie dough, a state known as a colloid results (like a mix between solid and liquid). Eventually, the cookies reach a solid state when baking is.

Thus, Baking cookies in the oven is an example of how energy is conserved . Electrical energy is neither transferred or transformed . Thermal energy either moves from one object to another as it is transferred or changes into a different form as it is transformed.

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The volume of oxygen is 14.7 litres.

What is volume?

volume is a measure of occupied three dimensional space.

Sol-Balanced chemical reaction: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

m(C₃H₈-propane) = 5.53 g.

n(C₃H₈) = m(C₃H₈) ÷ M(C₃H₈).

n(C₃H₈) = 5.53 g ÷ 44.1 g/mol.

n(C₃H₈) = 0.125 mol.

From chemical reaction: n(C₃H₈) : n(O₂) = 1 : 5.

n(O₂) = 0.625 mol.

T = 25° = 298.15K.

p = 1.04 atm.

R = 0.08206 L·atm/mol·K.

Ideal gas law: p·V = n·R·T .

V(O₂) = n·R·T / p.

V(O₂) = 0.625 mol · 0.08206 L·atm/mol·K · 298.15 K / 1.04 atm.

V(O₂) = 14.7 L.

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The structure of the compound that have been described in the question is shown in the image attached to this answer.

We know that in organic chemistry, the structure of a molecule is very instrumental to the way that the molecule would be able to undergo reaction. In this case, we have a compound that is said to have  5 carbons, 3 chlorine group side chains, and one propyl group side chain.

Our key task is first to visualize the molecule and they try to create the structure of the molecule. As we try to create the structure of the molecule, we must have in mind the tetravalence of carbon. That is, carbon can only form four bonds to itself.

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The equilibrium constant K of the electrochemical cell is 2.976.

The equilibrium constant of a chemical reaction is described as the value of its reaction quotient at chemical equilibrium, a state approached by a dynamic chemical system after sufficient time has elapsed at which its composition has no measurable tendency towards further change.

We have that:

ΔG = -nFE°cell

n = 2

Force value = 96,500 J/(V･mol)

E°cell = +0.0140 V

ΔG = -(2 *  96,500  * 0.0140)

ΔG = -2702 J

Then,

But;

ΔG = -R TlnK

lnK = -(ΔG/RT)

The value of K = e^[-(ΔG/RT))

The value of K = e^[-(( -2702)/8.314 * 298]

The value of K = 2.976

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Based on the given frequency of the wave, the wavelength of the wave is 3.75 * 10⁻⁷ m.

The frequency of a wave is the number of complete oscillations performed by the wave per second.

The wavelength is the distance between successive points on the wave.

The relationship between the wavelength and frequency of a wave is given below:

Wavelength = velocity / frequency

Assuming the given wave is an electromagnetic wave, the velocity of the wave is 3.0 * 10⁸ m/s

Wavelength = 3.0 * 10⁸ m/s / 8.50 * 10¹⁴ s⁻¹

Wavelength = 3.75 * 10⁻⁷ m

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Answer:

24.984466667

Explanation:

add all mass values and divide by amount (3)

From the mole ratio of the reaction, the mass of magnesium bromide formed when 1.00 g of magnesium reacts with 5.00 g of bromine is 2.88 g.

The mole ratio of the reaction between magnesium and bromine to form magnesium bromide is found in the equation of the reaction.

The equation of reaction is given below as follows:

Mole ratio of magnesium to bromine is 1 : 1

Moles of magnesium reacting = 1 / 24 moles

Moles of magnesium = 0.0416

Moles of bromine reacting = 5 / 180

moles of bromine reacting = 0.0277 moles

Bromine is the limiting reactant

Mass of magnesium bromide formed = 0.0277 * 104 g

Mass of magnesium bromide formed = 2.88 g

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The wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.

What is wavelength?

Wavelength in a wave is the distance between any given point on a wave and the same point on the adjacent wave that is crest to crest or trough to trough. It can be measured in the direction of the given wave.

The wavelength in nm of the cosmic ray can be calculated as,

λ = c / ν

where λ is the wavelength, ν is frequency in Hz or s^-1 and c is velocity of light.

λ = (3 x 10^8 m/s) / 2.3 x 10^24 Hz = 1.304 x 10^-16 m = 1.304 x 10^-7 nm.

Therefore, the wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.

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The following is involved in bonding between atoms is electron

There are four type of chemical bonds essential for life to exist and it is ionic bond, covalent bond, hydrogen bond, and Vander wall interaction and all of these are different kind of bond to play various role in biochemical interaction and the electron on the outermost energy level of the atom are called valence electron and the valence electron are involved in bonding one atom yo another

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-28.1 °F is a temperature in Fahrenheit and is converted to degrees Celsius and Kelvin as follows:

Temperature is the measure of cold or heat, often measurable with a thermometer.

Temperature can be measured in the following units;

Kelvins (absolute temperature)

Kelvins (K) is the international system of units (S.I unit), the base unit of thermodynamic temperature; 1⁄273 of the thermodynamic temperature of the triple point of water.

Degrees Celsius is the metric unit of temperature, a derived unit of the International System of Units.

°F is converted to °C as follows:

(32°F − 32) × 5/9 = 0°C

-28.1°F = -33.39°C

°F is converted to K as follows:

(-28.1°F − 32) × 5/9 + 273.15 = 239.761K

= 239.76K

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Volume the fluorine gas occupies = 0.73L

What is volume of a gas ?

The gas's volume:

The area occupied by gaseous particles under normal temperature and pressure circumstances is referred to as the volume of gas.

It is identified as a "V."

The letter "L" stands for "liters," the SI unit of volume.

At normal temperature, a mole of gas has a volume of 24 m3, or 24 000 cm3.

The molar volume of a gas is the name given to this quantity.

The gas equation

PV = n R T

P = pressure = 2.04 atm

T = temperature = 5.20 Celsius = 278.20K

V = volume

n = no of moles = 1.24/19 = 0.065moles

R = gas constant = 0.0821lit atm /K

V = 0.065*0.082*278.20/ 2.04 =  0.73L

Volume the fluorine gas occupies = 0.73L

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This reaction, CIO + O - CI + O2, is an example of an endothermic chemical reaction, where the reactants take heat energy from their environment and use it to create products.

Endothermic chemical reactions occur when the reactants take in heat energy from their environment to create products. A cooling effect is produced by these reactions because they cause their surroundings to become cooler.

Exothermic means that the chemical reaction releases energy. In exothermic reactions, bonds are broken in the reactants, but more energy is released when the bonds are broken in the products. Endothermic chemical processes are those that take up (or utilize) energy.

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Answer:

298k

Explanation:

because 298k is lower than 302k

12500 joule heat is released when an acetylene (C2H2) torch burns 250 grams of fuel

q=ΔnH

H  acetylene = -1300 kJ/mo

n=given mass/molar mass

given mass= 250 g

molar mass=26

n= 250/26

n=9.61

q=ΔnH

q=9.61× -1300 kJ/mo

q=-12500 joule

In thermodynamics, heat has a very specific definition that is different from how we generally use the word. When two systems with various surface temperatures come into touch with one another, heat is the thermal energy that is transferred. The letters q or Q stand for heat, which is measured in joules.

Heat is sometimes referred to as a process quantity since it is defined in the context of a process through which energy can be conveyed. We may talk about the heat that a hot cup of coffee imparts to your hand, but we don't talk about the heat that a cup of coffee itself holds. Heat is yet another noteworthy quality.

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The molar mass of the gas is obtained as 32.1 g/mol.

The molar mass has to do with the mass one mole of a substance. We know that according to the question, we can be able to obtain the number of moles of the compound from the ideal gas equation.

This is how we are able to get the number of moles of the gas as 0.14 moles. Now we need to use the information that we have to get the molar mass of the gass.

Number of moles = mass/ molar mass

Molar mass = mass/Number of moles

Molar mass =  4.5g/0.14  moles

= 32.1 g/mol

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Having disposal sites where people can safely dispose of medications, household cleaners and waste instead of pouring them down their sink drains impacts the environment by reducing water pollution.

What is water pollution?

Pouring chemicals down the drain poses the most immediate risk of water pollution. Chemicals are harmful for consumption by all living things when they are dumped down the drain because of the effects they have on our rivers, lakes, streams, and other water supplies.

In regions where contamination is happening, human health might suffer, which can cause serious health problems. Animals and plants that are given contaminated water get sick and die, which has an impact on agriculture as well.

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The frequency of the photon is 3.57 * 10^14 Hz. the energy in joules is 2.4 * 10^-19 J while the energy in kJ/mol is 3.9 * 10^-40 kJ/mol.

The energy of the photon can be obtained by the use of an adaptation of the Plank equation. Let us now use;

E = hc/λ

E = energy

h = Plank Constant

c = Speed of light

λ = wavelength

a)

c = λf

f = c/λ

Substituting values;

f = 3 * 10^8/839.6 * 10^-9

f = 3.57 * 10^14 Hz

b)

E = 6.6 * 10^-34 * 3 * 10^8/ 839.6 * 10^-9

E = 2.4 * 10^-19 J

c)

Energy in kJ/mole

Substituting values;

2.4 * 10^-19 J * 10^3/6.02 * 10^23

= 3.9 * 10^-40 kJ/mol

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The formula of the hydrate would be  [tex]MgSO_4.6H_2O[/tex].

In order to get the formula of the hydrated salt, the empirical formula method can be used to know the mole of the salt and that of the water.

The formula of magnesium sulfate = [tex]MgSO_4[/tex]

The formula of water = [tex]H_2O[/tex]

Mass of hydrated magnesium sulfate = 18.00 g

Mass of anhydrous magnesium salt = 9.211g

Mass of water = 18 - 9.211

                      = 8.789 g

Now, let's find the mole equivalent of each component:

Molar mass of magnesium sulfate = 120.366 a/mol

Molar mass of water = 18.01 g/mol

Mole of magnesium sulfate anhydrous = 9.211/120.366

                                                                 = 0.0765 mole

Mole of water = 8.789/18.01

                       = 0.4880 mole

Now, let's divide by the lowest mole:

Magnesium sulfate = 0.0765/0.0765

                                 = 1

Water = 0.4880/0.0765

           = 6.37

Thus, the mole ratio of magnesium sulfate and water of hydrate is 6 to 1. Therefore, the formula of the hydrated salt would be [tex]MgSO_4.6H_2O[/tex].

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Explanation:

Write a short report describing your ideas for a school of the future. You can suggest changes to:

• school buildings and classrooms.

• the library

• the cafeteria

• how classes are taught.

Give a reason for each of your suggestions. Use a variety of synonyms and accurate vocabulary.

200 words only

The amount of acetylsalicylic acid in the tablet is 0.001389 moles and the number of hydrogen atoms in the amount of acetylsalicylic acid in the tablet is 6.69 × 10²¹.

(a)

The formula of acetylsalicylic acid is C₉H₈O₄.

Molar mass of C₉H₈O₄ = 9 × atomic mass of C + 8 × atomic mass of H + 4 × atomic mass of O

                                      = 9 × 12 + 8 × 1 + 4 × 16

                                      = 108 + 8 + 64

                                      = 180

No of moles of acetylsalicylic acid = Given mass / molar mass

                                                         = 0.25 / 180

                                                         = 0.001389

Hence, the number of moles of acetylsalicylic acid is 0.001389 moles.

(b)

Number of hydrogen atoms present in 1 mole of acetylsalicylic acid = 6.023 × 10²³ atoms

Number of hydrogen atom present in 0.001389 moles of acetylsalicylic acid = 0.001389 × 6.023 × 10²³ = 0.008365 = 8.36 × 10²⁰ atoms.

Now there are 8 hydrogen atoms in acetylsalicylic acid so,

Number of atoms of hydrogen in acetylsalicylic acid = 8 × 8.36 × 10²⁰ atoms = 6.69 × 10²¹ atoms.

Hence, the number of atoms of hydrogen in 0.001389 moles of acetylsalicylic acid is 6.69 × 10²¹ atoms.

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Answer:

a. Yes, both W and Y have the same atomic number. Since the atomic mass equals the sum of protons (which is the atomic number) and neutrons, both W and Y have different numbers of neutrons, making them isotops of each other.

b. Both W and Y have the same atomic number, making both the same element. Therefore they have the same chemical properties.

c. W: 29 protons, 34 neutrons, 29 electrons

Y: 29 protons, 36 neutrons, 29 electrons

Explanation:

a. Yes, both W and Y have the same atomic number. Since the atomic mass equals the sum of protons (which is the atomic number) and neutrons, both W and Y have different numbers of neutrons, making them isotops of each other.

b. Both W and Y have the same atomic number, making both the same element. Therefore they have the same chemical properties.

c. W: 29 protons, 34 neutrons, 29 electrons

Y: 29 protons, 36 neutrons, 29 electrons

Remember: mass number = protons (atomic #) + neutrons

From the general gas equation, the volume of the same sample of gas at STP will be closest to the volume at 350 K and 1 atm multiplied by 273/350; option D.

The relationship between the volume, temperature, and pressure of a gas is given by the general gas equation below:

P₁V₁ / T₁ = P₂V₂ / T₂

Where;

P₁ = initial pressure

V₁ = initial volume

T₁ = initial temperature

P₂ = final pressure

V₂ = final volume

T₂ = final temperature

Solving for V₂;

V₂ = P₁V₁T₂ / P₂T₁

V₂ = 350 * 1 * 273/350

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