What is the molarity of 10g of carbon in a 500L solution?

Answer:

due to the formation of an oxide or hydroxide layer

Explanation:

magnesium is a reactive metal...when left in air it reacts with oxygen to form an oxide layer of MgO and it can react with moisture to form Mg(OH)2 LAYER ON THE SURFACE.

Answer:

through process of diffusion

Explanation:

air particles and odours move freely in all directions and eventually spreads out thus reaching the sitting room

The process of diffusion causes the particles of the aroma of the fried fish to reach the living room.

Diffusion can be described as the net movement of anything such as molcules, or energy from a region of higher concentration to a region of lower concentration. Diffusion is generally driven by a gradient in Gibbs free energy or chemical potential.

The concept of diffusion can be used in fields such as physics, chemistry, biology, sociology, economics, and finance. The central idea of diffusion is common that a substance undergoing diffusion spreads out from a point or location at which there is a higher concentration of that substance.

A gradient can be defined as the change in the value of an amount such as concentration, pressure, or temperature with a change in another variable, distance.

A change in concentration over a distance is known as a concentration gradient, and a change in pressure over a distance is known as a pressure gradient.

The Latin word diffusion means "to spread out." Therefore, the aroma of the fried fish diffuses and reaches to lining room.

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Explanation:

Molar mass of

B

=

10.81

g

⋅

m

o

l

−

1

. If there are 36 odd grams of

B

, there are approx.

7

2

×

N

A

boron atoms, where

N

A

is Avogadro's number.

Explanation:

35.76

⋅

g

10.81

⋅

g

⋅

m

o

l

−

1

×

6.022

×

10

23

m

o

l

−

1

=

?

?

Answer link

MAT

Nov 15, 2015

1.991

×

10

24

Explanation:

Molar mass of B = 10.81g/mol

So, 1 mole of B = 10.81g

and 1 mole =

N

A

=

6.023

×

10

23

By combining,

10.81g of B =

6.023

×

10

23

atoms of B

thus,

35.76g of B =

6.023

×

10

23

10.81

×

35.76

35.76g of B =

1.991

×

10

24

48.176 × 10¹⁷ atoms of boron are present in 8.0 × 10⁻⁶ moles of boron.

Avogadro's number is the number of particles in one mole of substance. 6.022 × 10²³ is known as Avogadro's constant / Avogadro's number.

Avogadro's number = 6.022 × 10²³

How to find the number of atoms ?

Number of atoms = Number of moles  × Avogadro's Number

                             = 8.0 × 10⁻⁶ × 6.022 × 10²³

                             = 48.176 × 10¹⁷ atoms of boron

Thus, from the above conclusion we can say that 48.176 × 10¹⁷ atoms of boron are present in 8.0 × 10⁻⁶ moles of boron.

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The total binding energy for lithium is 39.25 Mev

The binding energy per nucleon for lithium is 5.61 Mev / nucleon

    Binding energy is the total energy required for the breakdown of a nucleus to its component nucleons

    Total binding energy is the amount of energy released when the atom is formed from its constituent electron, protons and neutrons.

The given mass are lithium is 7.016004 u  and hydrogen is 1.007825

There are 3 hydrogen and 4 neutrons

To calculate the Total binding energy

3 ( 1.0782) +  4 ( 1.008665 ) = 7.058135 u

Mass of neutron is 1.008665 u

1 atomic mass unit is 931.5 Mev

TBe = ( 7.058135 - 7.016004 ) × 931.5

       = 39.25 Mev

Total binding energy is 39.25 Mev

BE= 39.25 / 7

    = 5.61 Mev / neucleon

Hence, The total binding energy is 39.25 Mev.

             The binding energy is 5.61 Mev / neucleon.

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Answer:

The amount of isopropyl alcohol contained in 150 ml of the solution is 117.15 grams

Explanation:

The density of a substance is the mass per unit volume, therefore, we have;

The density of the isopropyl alcohol = 0.785 g/ml at 25°C

The  density = mass/volume

Mass = Density × Volume

The mass of the 150 ml of isopropyl alcohol is therefore;

Mass = 0.785 g/ml × 150 ml = 117.15 g

The amount in grams contained in 150 ml of sample = 117.15 g.

Answer:

a. All elements are composed of atoms.

Explanation:

dalton's atomic theory says that Compounds are composed of atoms of more than 1 element. The relative number of atoms of each element in a given compound is always the same. Chemical reactions only involve the rearrangement of atoms. Atoms are not created or destroyed during chemical reactions.

Answer:

A water repellent protein that divides into hard and soft types

The given statement "A hot plate is the only heat source available in the lab room to heat the hydrate in a crucible at least 2 times for 10-15 minutes at medium-high setting" is true because the water in hydrate can be removed by heating.

The crucible is the type of the laboratory glassware that is designed to melt or to burn the solid chemicals over the burner. Crucible is made from the heat resistant ceramic or the metal. The hot plates are the laboratory tools that is used for the  uniformly heat the samples. The hot plates are available with Varity of the  number of the different heating top styles.

Thus, the hot plate is the heating tool to heat the hydrate in the crucible.

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The correct classification for both calcium (Ca) and iron (Fe) is:

D) Ca is an alkaline earth element and a metal, and Fe is a transition element and a metal.

Calcium (Ca) belongs to the alkaline earth metals group, which is located in Group 2 of the periodic table. Alkaline earth metals are characterized by their reactivity, high melting points, and tendency to form 2+ cations. Therefore, Ca is classified as an alkaline earth element and a metal.

Iron (Fe) is a transition element, also known as a transition metal. Transition metals are located in the d-block of the periodic table and are characterized by their ability to form multiple oxidation states and exhibit variable valencies. Fe is classified as a transition element and a metal due to its properties and location in the periodic table.

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The percent composition by mass of carbon in lithium carbonate (Li₂CO₃) is 16.25%.

The percent composition by mass of carbon in lithium carbonate (Li₂CO₃) can be determined by using the following formula:

percent composition by mass = (mass of element / mass of compound) x 100%

To find the percent composition by mass of carbon in Li₂CO₃, we first need to find the molar mass of Li₂CO₃ and the molar mass of carbon. The molar mass of Li₂CO₃ is 73.89 g/mol, and the molar mass of carbon is 12.01 g/mol.

Since there is 1 mole of carbon for every mole of Li₂CO₃, then we can simply plug these values into the formula:

percent composition by mass of carbon = (12.01 g/mol / 73.89 g/mol) x 100%
percent composition by mass of carbon = 16.25%

Therefore, for every compound of Li₂CO₃, it contains 16.25% carbon by mass.

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A metal and nonmetal which forms or equals to ionic bond is sodium and chlorine respectively.

The force of attraction which binds or holds together two different atoms which are metals and nonmetals is known as ionic bond.

Na + Cl ------ NaCl

Metal Nonmetal

Sodium has 1 valence electron and chlorine has 7 valence electrons, sodium readily gives it valence electron to chlorine to achieve an octet configuration.

As chlorine receives this, it has 8 valence electrons too. The bonding formed here is known as ionic bonding.

A covalent bond is formed mostly between nonmetals.

For instance, a covalent bond is formed between the sharing of electrons between carbon and oxygen to give carbon dioxide.

Most ionic compounds formed as a result of ionic bonding as characteristized by the following properties:

Therefore, a metal and nonmetal which forms or equals to ionic bond is sodium and chlorine respectively.

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The hydronium ion concentration in an aqueous hydrobromic acid solution with a pH of 4.920 is 1.21 × 10^(-5) M.

To find the hydronium ion concentration [H3O+] in an aqueous solution, we can use the pH formula. The pH is the negative base-10 logarithm of the hydronium ion concentration:

pH = -log10[H3O+]

We can rearrange the formula to solve for [H3O+]:

[H3O+] = 10^(-pH)

Given a pH of 4.920, we can now find the hydronium ion concentration:

[H3O+] = 10^(-4.920)

[H3O+] = 1.21 × 10^(-5) M

The hydronium ion concentration in the hydrobromic acid solution is approximately 1.21 × 10^(-5) M.

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The evaporation of water from your skin is an example of an endothermic reaction because heat is lost from the body as the water evaporates from the skin.

Based on the heat changes that occur in reaction, reactions can be classified into two types;

Exothermic reactions are reactions in which the heat content of the reactants is greater than the heat content of the products. Hence, heat is given out during the reaction. An example is the dissolution of acids in water.

Endothermic reactions are reactions in which the heat content of the reactants is less than the heat content of the products. Hence, heat is absorbed during the reaction. An example is the evaporation of water from the skin.

Other types of endothermic reactions are the melting of ice and thermal decomposition.

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A reaction occurs at the cathode is Option b. 2H₂O (l) + 2e⁻ → H₂ (g) + 2OH⁻ (aq)

At the cathode, reduction occurs, which involves the gain of electrons. In this case, water molecules (H₂O) are reduced to produce hydrogen gas (H₂) and hydroxide ions (OH⁻).

The half-reaction at the cathode can be understood as follows:

2H₂O (l) + 2e⁻ → H₂ (g) + 2OH⁻ (aq)

Here, two electrons (2e⁻) are gained by two water molecules, resulting in the formation of hydrogen gas (H₂) and hydroxide ions (OH⁻) in the aqueous solution. Therefore, the correct option for the reaction occurring at the cathode in the given electrolytic cell is 2H₂O (l) + 2e⁻ → H₂ (g) + 2OH⁻ (aq). Therefore, Option b is correct.

The question was incomplete. find the full content below:

A reaction in an electrolytic cell is as follows:

2NaCl(aq) + 2H₂O (1)→ Cl₂ (g) + H₂ (g) + 2NaOH(aq).

Which reaction occurs at the cathode?

a. Cl₂ (g) + 2e → 2Cl(aq)

b. 2H₂O (1) + 2e → H₂ (g) + 2OH(aq)

c. H₂(g) + 2OH(aq) → 2H₂O (1) + 2e¯

d. 2C1 (aq) → Cl2 (g) + 2e7

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To find the empirical formula from a molecular formula, you should divide the Subscripts by the Some integer in order to get the smallest whole number.

Part-A

The empirical formula of \(Al_{2}Br_{6}\)is \(AlBr_{3}\), we get it by dividing both subscript (i.e. 2&6) by 2.

Part-B

The empirical formula of C8H10 is

Simplest ratio of CH = 8:10 = 4:5

Hence, empirical formula =C4H5

Part-C

The empirical formula of C4H8O2 is C2H4O, we get it by diving all subscripts \(\frac{4}{2} : \frac{8}{2} :\frac{2}{2}=2:4:1\) by 2.

Part- D

molecular formula= P4O10

simplest ratio of

\(\frac{P}{O}= \frac{2}{5} \\ empirical formula = p_{2}O_{5}\)

Part -E

The empirical formula of C6H9CL2 is C3H2CL,we get it by diving all subscripts\(\frac{6}{2}:\frac{4}{2}:\frac{2}{1} =3:2:1\) by 2

Part-F

The empirical formula of B3N3H6is BNH2, we get it by diving all subscripts \(\frac{3}{3} :\frac{3}{3} :\frac{6}{3} = 1:2:3\) by 2.

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The answer is c. 8 electrons are in bromine's next to outer shell (n = 3). Therefore, the answer is c. 8 electrons are in bromine's next to outer shell (n = 3).

Bromine has an atomic number of 35, which means it has 35 protons in its nucleus and 35 electrons in its electron cloud. To determine the number of electrons in bromine's next to outer shell (n = 3), we need to look at the electron configuration of bromine. The electron configuration of bromine is: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

The electrons in the outermost shell (n = 4) are the valence electrons, which are involved in chemical reactions. However, we are interested in the electrons in the next to outer shell (n = 3), which are also important in determining chemical properties. To determine the number of electrons in the next to outer shell, we need to subtract the number of electrons in the outermost shell (n = 4) from the total number of electrons in the atom.

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Answer:

42,07%and 18,90%

Explanation:

The solubility of the gas when the pressure is decreased to 101 KPa at constant temperature is 0.853

This states that the solubility of a gas in liquids at constant temperature is proportional to its pressure. Mathematically, it can be expressed as

S₁ / P₁ = S₂ / P₂

Where

From the question given above, the following data were obtained

S₁ / P₁ = S₂ / P₂

0.98 / 116 = S₂ / 101

Cross multiply

116 × S₂ = 0.98 × 101

Divide both side by 116

S₂ = (0.98 × 101) / 116

S₂ = 0.853

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Answer: The molecular formula of ammonia is NH3.

Explanation:

Ammonia and calcium carbonate are two separate compounds, each with their own molecular formulas.

The molecular formula of ammonia is NH3. It consists of one nitrogen (N) atom bonded to three hydrogen (H) atoms.

The molecular formula of calcium carbonate is CaCO3. It consists of one calcium (Ca) atom bonded to one carbonate ion (CO3), which in turn consists of one carbon (C) atom bonded to three oxygen (O) atoms.

Therefore, there is no single molecular formula for "ammonia calcium carbonate" as it refers to a combination of two distinct compounds.

The mass of the air mattress has decreased

Answer:

D. 18g

Explanation:

To get the answer, we will use an equation to convert the grams of C2H5OH to moles of C2H5OH, then I will convert the moles of C2H5OH to moles of CO2, and then I will convert the moles of CO2 to grams of CO2.

9.2g C2H5OH / 46.07g C2H5OH = 0.199 mol C2H5OH

0.199 mol C2H5OH (2 mol CO2 / 1 mol C2H5OH) = 0.398 mol CO2

0.398 mol CO2 (44.01g CO2 / 1 mol CO2) = 17.515g CO2

The answer closest to our answer is answer choice D. 18g

Therefore, the answer is D

In normal temperatures, carbon dioxide is a colorless, non-flammable gas, its calculated value is "18 gram".

Equation:

\(\to \bold{C_2H_5OH\ (l)+3O_2\ (g) \to 2CO_2\ (g)+3H_2O\ (g)}\)

In the above-given scenario, We'll utilize an equation that converts grams of ethanol to moles of ethanol, then converts moles of ethanol to moles of carbon dioxide, and finally, transforms the moles of carbon dioxide into grams of carbon dioxide to get the result.

Following are the calculation of the conversion of carbon dioxide:

\(\to \frac{9.2\ g\ C_2H_5OH }{46.07\ g\ C_2H_5OH} = 0.199\ mol C_2H_5OH\\\\\to 0.199\ mol\ C_2H_5OH \ (\frac{2\ mol\ CO_2}{ 1\ mol\ C_2H_5OH}) = 0.398\ mol\ CO_2\\\\\to 0.398\ mol \ CO_2 \ (\frac{44.01\ g\ CO_2}{1 \ mol\ CO_2}) = 17.515\ g\ CO_2 \approx 18\ g \ CO_2\\\\\)

Therefore, the answer is "Option D".

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A phenol has an -OH group bonded to a carbon in a benzene ring.

Phenols are organic compounds that contain a hydroxyl (-OH) group bonded to an aromatic ring. In a phenol molecule, the hydroxyl group is directly bonded to a carbon atom in the aromatic benzene ring.

The benzene ring in a phenol is a six-membered ring with alternating double bonds. It is a planar, cyclic, and conjugated system, which provides stability to the molecule. The hydroxyl group in a phenol is attached to one of the carbon atoms in the ring, which is known as a carbon in a benzene ring.

Phenols can have various substituents on the benzene ring, which can affect their properties and reactivity. However, the hydroxyl group is always directly attached to a carbon in the benzene ring.

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The result table indicate that A. The solute is a SOLID because it has a DECREASE in the amount dissolved as temperature decreases.

The solubility of a solid solute in a liquid solvent generally decreases as the temperature decreases. This is because the kinetic energy of the solute molecules decreases as the temperature decreases. As the kinetic energy of the solute molecules decreases, they are less likely to have enough energy to escape from the solution and enter the gas phase.

In the table, as the temperature decreases, the concentration of the solute in the solution decreases. This indicates that the solute is a solid and that the solubility of the solute decreases as the temperature decreases.

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Answer:

First, we need to set up the equation for the ionization of HCHO2:

HCHO2 + H2O ↔ H3O+ + CHO2-

The Ka expression for this reaction is:

Ka = [H3O+][CHO2-]/[HCHO2]

We know the concentration of HCHO2 is 0.015 M, and the Ka value is 1.8 × 10^-4. We can use an ICE (initial, change, equilibrium) table to find the concentration of H3O+ and CHO2- at equilibrium:

HCHO2 + H2O ↔ H3O+ + CHO2-

I: 0.015 M 0 M 0 M 0 M

C: -x +x +x +x

E: 0.015-x x x x

Using the Ka expression, we can plug in our equilibrium concentrations (in terms of x):

1.8 × 10^-4 = x^2/(0.015-x)

Simplifying:

x^2 = 1.8 × 10^-4 (0.015-x)

x^2 = 2.7 × 10^-6 - 1.8 × 10^-4 x

Rearranging and using the quadratic formula:

x = [1.8 × 10^-4 ± sqrt((1.8 × 10^-4)^2 - 4(1)(-2.7 × 10^-6))] / 2(1)

x = 0.0136 or 0.00108

We reject the 0.0136 value, since it is greater than our initial concentration of 0.015 M. Therefore, our equilibrium concentration of H3O+ is 0.00108 M.

To find the pH, we take the negative logarithm of the H3O+ concentration:

pH = -log(0.00108) = 2.97

Therefore, the pH of a 0.015 M solution of HCHO2 is 2.97.

Answer:

I would say sunshine

Explanation:

the major ingredients are...

The four basic ingredients of weather and climate are pressure, moisture, wind, and temperature.

hope this helps!!

and please give me brainliest! :)

The option that is not a major ingredient in weather is B. Sunlight.

Weather simply means the state of the atmosphere at a particular place and time. It should be noted that the weather of a place can be different from another place. For example, a place can be sunny while another can be rainy.

The atmospheric phenomena that are the ingredients of weather are clouds, water, and air. Based on the question asked, sunlight isn't an ingredient.

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Answer:

22g of copper?

Explanation: