In an endothermic reaction, the energy of
the surroundings is
than the energy of
the system

(a)  The mass percent of HCl in the solution is approximately 36.1%.

(b)  The molality of HCl in the solution is approximately 15.5 mol/kg.

(c)  The mole fraction of HCl in the solution is approximately 0.218.

(a) To calculate the mass percent of HCl, we need to determine the mass of HCl in a given volume of the solution.

Given: Concentration of HCl = 11.8 M

Density of the solution = 1.190 g/mL

First, we need to calculate the mass of the solution. Since density is mass per unit volume, the mass of 1 mL of the solution is 1.190 g.

Next, we need to calculate the mass of HCl in 1 mL of the solution. Since the concentration is given in moles per liter (M), and the molar mass of HCl is 36.46 g/mol, we can calculate the mass of HCl in 1 mL as follows:

Mass of HCl = concentration × volume × molar mass

          = 11.8 mol/L × 0.001 L × 36.46 g/mol

          = 0.430 g

Now, we can calculate the mass percent of HCl using the following formula:

Mass percent = (mass of solute ÷ mass of solution) × 100

           = (0.430 g ÷ 1.190 g) × 100

           ≈ 36.1%

(b) The molality of HCl is calculated by dividing the moles of solute (HCl) by the mass of the solvent (water) in kilograms.

Since the density of the solution is given as 1.190 g/mL, the mass of 1 mL of the solution is 1.190 g. However, we need to consider the density of the solvent (water) to calculate the mass of water in the solution.

Assuming the density of water is 1 g/mL, the mass of water in 1 mL of the solution is (1.190 g - 0.430 g) = 0.760 g.

To calculate the molality of HCl, we need to convert the mass of water to kilograms:

Mass of water (kg) = 0.760 g ÷ 1000 = 0.000760 kg

The molality (m) is calculated using the formula:

Molality = (moles of solute ÷ mass of solvent in kg)

        = (11.8 mol/L × 0.001 L) ÷ 0.000760 kg

        ≈ 15.5 mol/kg

(c) The mole fraction (X) of HCl is calculated by dividing the moles of HCl by the total moles of all components in the solution.

To calculate the mole fraction, we need to consider the volume of the solution and convert it to liters.

Given: Concentration of HCl = 11.8 M

Volume of the solution = 1 mL

Volume of the solution (L) = 1 mL ÷ 1000 = 0.001 L

To calculate the mole fraction of HCl, we need to calculate the moles of HCl and the moles of water (solvent) in the solution.

Moles of HCl = concentration × volume

            = 11.8 mol/L × 0.001 L

            = 0.0118 mol

Moles of water = mass of water ÷ molar mass of water

             = 0.760 g ÷ 18.015 g/mol (molar mass of water)

             = 0.0422 mol

Total moles in the solution = moles of HCl + moles of water

                           = 0.0118 mol + 0.0422 mol

                           = 0.054 mol

Mole fraction of HCl = moles of HCl ÷ total moles

                   = 0.0118 mol ÷ 0.054 mol

                   ≈ 0.218

For such more questions on molality

https://brainly.com/question/14366957

#SPJ8

 Answer:

I live in the USA so the questions have been answered to reflect that accordingly.

1. The letter which represents summer where I live is Letter C

Explanation:

Letter C represents the June solstice which usually takes place between June 20 and June 21.

2. The letter which represents winter where I live is letter A.

Explanation:

Letter A represents the December solstice. Another name for this is Winter Solstice. This usually takes place in December for those living in the Northern Hemisphere like me. It is projected that this will take place on Tuesday, 21 December 2021.

Another name for this is Northern Hemisphere Winter Solstice as it marks the first day of winter.

3. The correct seasons for June Solstice are:

Northern Hemisphere: Summer Solstice

This projected to occur on Sunday, 20 of June 2020. It will be characterized by 1 hour of twilight and approximately 10 hours each of daylight and night time.

4. Southern Hemisphere: Summer solstice

This is anticipated on Tuesday, 21 December 2021. It will also be characterized by 1 hour of twilight and approximately 10 hours each of daylight and night time.

5. Northern Hemisphere: Autumnal (Fall) Equinox  

6. Southern Hemisphere:  Spring (Vernal) equinox  

7. December Solstice - Northern Hemisphere: Winter Solstice is the Day of the Year with the shortest amount of sunlight

8. December Solstice - Southern Hemisphere: Summer Solstice. This is the day of the year with the longest amount of sunlight

9. March Equinox - Northern Hemisphere: Spring (Vernal) Equinox. This is the start of spring.

10. March Equinox - Southern Hemisphere: Autumnal (Fall) Equinox. This is the start of Fall.

Cheers!

answer: c- new knowledge showed that the exact location of electrons can not be known.

Explanation: i just did it ;)

Answer:

D

Explanation:

The particles will move side to side over large areas.

Answer:

The particles will move side to side over large areas.

Explanation:

The weaker acid involved in the given reaction is HC₂O₄⁻. Option B is correct.

The position of equilibrium in an acid-base reaction can provide information about the relative strength of the acids and bases involved. In the given reaction, if the equilibrium lies to the left, it indicates that the forward reaction is not favored and the reverse reaction is favored.

This means that the products NH₃(aq) and H₂C₂O₄(aq) have a tendency to react and form the reactants HC₂O₄⁻(aq) and NH₄⁺(aq).

Therefore, the acid dissociation constant of HC₂O₄⁻(aq) is K_a1 = 5.9 × 10⁻². The acid dissociation constant of H₂C₂O₄(aq) is K_a2

= 5.9 × 10⁻⁵.

Since the equilibrium lies to the left, it means that the concentration of HC₂O₄⁻(aq) is higher than that of H₂C₂O₄(aq) at equilibrium. This suggests that HC₂O₄⁻(aq) is the weaker acid, as it does not dissociate as much as H₂C₂O₄(aq) does.

Hence, Option B is correct.

To know more about acid-base reaction here

https://brainly.com/question/15686955

#SPJ1

According to research, the ear is a complex organ that meets hearing, being of great importance to humans.

Hearing is a physiological process where sound waves, which are vibrations, enter through the outer ear and reach the middle ear, causing the eardrum to vibrate.

In this sense, the vibrations, in turn, cause the movement of small bones called stirrup, anvil and malleus, where they reach the organ of Corti, stimulating the auditory nerve and finally become nerve impulses that reach the brain.

Therefore, we can conclude that according to research, hearing is a process that implies that sound waves first impact the eardrum until finally reaching the auditory centers of our brain.

Learn more about hearing here: https://brainly.com/question/16034254

#SPJ1

Answer:

Explanation:

The molar volume of a gas at STP (Standard Temperature and Pressure), which is equal to 22.4 liters.

There are 6.02x10^23 molecules in 1 mole of Argon.

So for 1.51x10^24 molecules of Argon, the volume at STP should be

(1.51x10^24 / (6.02x10^23)) * 22.4

= 56.19 liters

Moles of Argon:-

Now

\(\\ \rm\Rrightarrow 2.5(22.4)=56L\)

1. C6H10O5 + 6O2 → 6CO2 + 5H2O

2. MgO + H2O → Mg(OH)2

3. 151.2444 grams of carbon dioxide are required to produce 3.44 moles of carbonic acid in the blood.

1. The complete, balanced chemical reaction for the burning of cellulose (C6H10O5), or wood, is:

C6H10O5 + 6O2 → 6CO2 + 5H2O

This reaction represents the combustion of cellulose in the presence of oxygen, resulting in the formation of carbon dioxide (CO2) and water (H2O).

2. The balanced equation for the reaction between magnesium oxide (MgO) and water (H2O) to produce magnesium hydroxide (Mg(OH)2) is:

MgO + H2O → Mg(OH)2

According to the equation, 1 mole of magnesium oxide reacts with 1 mole of water to produce 1 mole of magnesium hydroxide. Therefore, if 2.55 moles of magnesium oxide react, the same number of moles of magnesium hydroxide will be produced.

3. The balanced equation for the reaction between carbon dioxide (CO2) and water (H2O) to form carbonic acid (H2CO3) is:

CO2 + H2O → H2CO3

According to the equation, 1 mole of carbon dioxide reacts with 1 mole of water to produce 1 mole of carbonic acid. Therefore, if 3.44 moles of carbonic acid are produced, the same number of moles of carbon dioxide is required.

To calculate the mass of carbon dioxide, we need to know its molar mass, which is approximately 44.01 g/mol. Therefore, the mass of carbon dioxide required to produce 3.44 moles of carbonic acid is:

Mass = Moles × Molar mass

Mass = 3.44 moles × 44.01 g/mol

Mass = 151.2444 g

Therefore, 151.2444 grams of carbon dioxide are required to produce 3.44 moles of carbonic acid in the blood.

For more such qeustions on carbon dioxide visit:

https://brainly.com/question/21256960

#SPJ8

Answer:

A & C

Explanation:

The next one is A Edge 2022

The compound which are the structural isomers of the given compound is compound A & C.

Structural isomers are those isomers in which which are having the same molecular formula but different structural structures.

Hence A & C are the structural isomers of given compound.

To know more about structural isomers, visit the below link:
https://brainly.com/question/26298707

Answer:

k

Explanation:

kidfkvyg bt tgk mg RH g fu f

Answer:

false no oxygen atoms in skeleton system

Answer: metal turn orange and weaker as it gets oxidised

Explanation:

Answer:

awdaef

Explanation:

The pH of the solution is 4.

pH value is the measure of the acidity and basicity of a solution.

It measures the [H+] ion liberated by an acid when dissolved in a solution.

It has a range of 0 to 14 , where 0 to 6.9 indicates acidity , 7 represents neutral solution , More than 7 up to 14 indicates alkaline solutions.

pH value is also used to predict the completion of a reaction .

It is given in the question that

The value of pOH = 10

pH = ?

It is known that the sum of pH and pOH is equal to 14.

pH + pOH = 14

pH + 10 = 14

pH = 4

Therefore the pH of the solution is 4.

To know more about pH value

https://brainly.com/question/1503669

#SPJ1

while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

How to solve the problem?

The statement that is NOT true of zinc is "Grains are the most reliable food sources of zinc." While grains can be a source of zinc, they are not necessarily the most reliable source.

Zinc is an essential mineral that plays important roles in many biological processes, including immune function, protein synthesis, wound healing, and DNA synthesis. It is involved in various enzymatic reactions, and acts as a cofactor for many enzymes. Zinc is also important for proper growth and development, especially during childhood and adolescence.

Excess zinc intake can lead to decreased copper absorption, as both minerals compete for absorption in the intestines. This can lead to copper deficiency, which can cause anemia neutropenia, and other health problems. Therefore, it is important to maintain a balance between zinc and copper intake.

While grains can be a source of zinc, other foods such as meat, seafood, and dairy products are also good sources. Vegetarians and vegans may need to pay particular attention to their zinc intake, as plant-based sources of zinc may be less bioavailable than -based sources. Zinc supplements can also be used to prevent or treat deficiencies, but should be used with caution as excessive intake can have negative health effects.

In summary, while zinc is an important mineral with numerous functions in the body, it is not true that grains are the most reliable food source of zinc. A balanced diet that includes a variety of foods can provide adequate zinc intake for most people.

To know more about enzymes visit :-

https://brainly.com/question/14577353

#SPJ1

Answer:

true

Explanation:

Endo means inside

but exo means outside

an Endo thermic reaction sounds like it wouldn't be the one to give off heat, so it might be storing heat.

The following nuclides are most likely to decay via positron emission is S - 30 because it has lowest value of the N/Z value.

The one which have the lowest N / Z value will undergo the positron emission. N is the number of the neutron and Z is the number of the proton.

1) Na - 26 = number of neutron / no. of proton

               = 15 / 11

              = 1.3

2) I -121  = 68 / 53

             = 1.2

3) Ca - 42 = 22 / 20

                = 1.1

4) S - 30 = 14 / 16

             = 0.8

5) Sb - 122 = 71 / 51

                  = 1.3

Thus , S - 30 has the lowest N/Z  value.

To learn more about positron emission here

https://brainly.com/question/28506056

#SPJ4

Answer:  In two molecules of carbon dioxide (2CO2), there are _____.

two atoms of carbon

four atoms of oxygen

Answer:

THE STANDARD HEAT OF SOLUTION OF SODIUM HYDROXIDE IN WATER IS -7.68 KJ PER MOLE.

Explanation:

Variables:

Mass of NaOH = 3.25 g

Mass of water = 50 g

Initial temperature of water = 22°C = 22 + 273 K = 295 K

Final temperature of the reaction mixture = 24.8 °C = 24.8 + 273 K = 297.8 K

Assuming that:

1. specific heat of water = 4.184 J/g °C

2. total mass of the reaction mixture = 50 g + 3.25 g = 53.25 g

3. the rise in temperature = (297.8 K - 295 K ) = 2.8 K

4. Molar mass of sodium hydroxide = ( 23 + 16 + 1) = 40 g/mol

5. number of mole of sodium hydroxide = mass / molar mass

n = 3.25 g / 40 g/mol

n = 0.08125 moles

The rise in temperature for the reaction mixture produces how much of heat:

Heat = mass * specific heat * change in temperature

Heat = 53.25 * 4.184  * 2.8

Heat = 623.8344 J of heat.

Equation of reaction:

NaOH + H2O -------> NaOH + H2O + Heat

This is not a reaction but a dissolution as sodium hydroxide is very soluble in water and this reaction is exothermic where heat is given off.

So since 3.25 g having 0.08125 moles produces 623.8344 J of heat, 1 mole of the sodium hydroxide used will produce:

0.08125 mole of sodium hydroxide = 623.8344 J of heat

1 mole of sodium hydroxide = ( 623.8344 / 0.08125 J of heat

= 7677.96 J of heat per mole of sodium hydroxide.

= 7.68 kJ of heat

So therefore, the standard heat of solution of sodium hydroxide in water is -7.68 kJ of heat since its an exothermic reaction.

GREETINGS!

Net Reaction is,

\(2Al + 8H^+ + 2K^+ + 2OH^- + 4SO_{4}^2- + 22H_{2}O ---> 2KAl(SO_{4})_{2}.12H_{2}O +3H_{2}\)

For total yield,

as the moles are 2 for both aluminium and potash alum if we divide 1 gm by the mass of Al the outcome mole will be 0.3. since the moles are same so potash alum will also have 0.3 mole. Now multiply 0.3 moles by the mass of potash alum that is 474 so the ANSWER FOR THE YIELD WILL BE 142.2 gms

I HOPE THIS HELPS YOU!

The molarity of vinegar is 0.47368421 moles per liter.

To calculate this, we can use the following formula:

molarity = (initial_volume - total_volume_change) / final_volume

In this case, the initial volume is 7.5 mL, the total volume change is 21 mL, and the final volume is 28.5 mL. Plugging these values into the formula, we get:

molarity = (7.5 - 21) / 28.5 = -0.47368421

The negative value for molarity indicates that the solution is diluted. This is because the total volume of the solution increased by 21 mL, while the amount of solute (acetic acid) remained the same.

It is important to note that the molarity of a solution can change depending on the temperature. This is because the volume of a solution expands as it gets warmer. Therefore, it is important to measure the volume and temperature of a solution at the same time to get an accurate measurement of its molarity.

For such more questions on molarity

https://brainly.com/question/30704561

#SPJ8

Positively charged ions move from a salt bridge to the anode compartment in a galvanic cell, whereas negatively charged ions move from a salt bridge to a cathode compartment.

Galvanic or voltaic cells are two types of electrochemical devices that use chemical energy from spontaneous redox reactions to produce electricity. Convectional cell An electrochemical device known as a voltaic cell uses chemical reactions to produce electricity.

The electrical energy generated by the transfer of electrons during a redox reaction is used by galvanic cells to carry out practical electrical operations. Separating the oxidation / reduction half-reactions and connecting them with a wire makes it possible to collect the electron flow since the electrons must pass through the wire in order to move between the two half-reactions.

To know more about Galvanic Cell visit;

https://brainly.com/question/13031093

#SPJ4

Answer:

0.16mole

Explanation:

To solve this problem, we are going to assume that the number of moles of carbon to be determined is that at STP, standard temperature and pressure.

The number of moles of a substance at STP is given as;

 Number of moles  = \(\frac{volume}{22.4}\)  

Given volume  = 3.5L

Now, insert the parameters;

     Number of moles  = \(\frac{3.5}{22.4}\)   = 0.16mole

2520 joule is the heat (q) when a student dissolves 5.00 g of CaCl₂ into 200.0 g of H₂O. The temperature changes from 25.0°C to 28.0°C.

H₂O mass=200.0 g

c of H₂O= 4.2 joules per gram

Δt=3 °C

q=mcΔt

q=200.0 g×4.2×3

q=2520 joule

mass of solution= (solute + solute)

mass of solution=5.00 g+200.0 g

mass of solution=700 g

Heat has a very precise meaning in thermodynamics that is distinct from how we typically use the word. Heat is the thermal energy that is transmitted when two systems with different surface temperatures come into contact. Heat is denoted by the letters q or Q and is measured in Joules.

Because it is defined in the context of a process through which energy can be transmitted, heat is occasionally referred to as a process quantity. We don't discuss the heat that a cup of coffee contains, but we may discuss the heat that the cup of hot coffee transfers to your hand. Another significant characteristic is heat.

To know more about  Heat visit :brainly.com/question/13860901

#SPJ1

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

For such more question on polymerization

https://brainly.com/question/1602388

#SPJ8

Ionic compounds with the formula Ag2CO3 will be significantly more soluble in an acidic solution than in pure water. Both in the natural world and in the industrial sphere.

There are several varieties of acidic solutions. These acid solutions include everything from sulfuric acid to acetic acid, as well as hydrochloric acid and citric acid. With the chemical formula Ag2CO3, silver carbonate is a substance. This salt is yellow, although usual samples are greyish because elemental silver is present. Like other carbonates of transition metals, it has limited water solubility. Carbonated silver. With the chemical formula Ag2CO3, silver carbonate is a substance. Silver carbonate is yellow, however due to the elemental silver present, normal samples are greyish. Water does not readily dissolve it.

Learn more about acidic solutions here

https://brainly.com/question/13208021

#SPJ4

An average copper penny minted in the 1960s contained about 3.000g of Copper. 866.49 g chalcopyrite had to be mined to produce 100 pennies.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

1 mole is equal to 6.023 × 10 ²³ molecules.

Given:

Copper used = 100 pennies x 3.0g Cu per penny

= 300.0 g Cu

Then, identify the pathway and molar ratio from Cu formed back to CuFeS₂ required using the balanced reactions:

1 Cu₂S from 2 CuS : 2Cu from 1 Cu₂S : 2CuS from 2CuFeS₂

Therefore, 2Cu from 2CuFeS₂, they are in same molar ratio.

Now, convert g Cu to moles and g of CuFeS₂

= 300.0 g Cu × 1 mol Cu / 63.546g Cu × 2 mol CuFeS₂ / 2 moles Cu

= 4.72 moles CuFeS₂

The chalcopyrite had to be mined to produce 4.72 moles CuFeS₂ × 183.54 g CuFeS₂ / 1 mole CuFeS₂

= 866.49 g CuFeS₂

Thus,866.49 g chalcopyrite had to be mined to produce 100 pennies.

To learn more about the mole, follow the link;

https://brainly.com/question/26416088

#SPJ1

The symbol for an ion that has 31 protons, 38 neutrons, and 28 electrons is Ga, i.e., Gallium.

An ion is a net electrically charged atom or molecule. By convention, the charge of an electron is considered to be negative, and this charge is equal to and opposite to the charge of a proton, which is considered to be positive.

Ions are formed by adding or removing electrons from neutral atoms, molecules, or other ions.

This is done by combining ions with other particles; or by rupturing a covalent bond between two atoms in such a way that both of the bond's electrons remain in association with one another.

Thus, Gallium is the symbol for an ion with 31 protons, 38 neutrons, and 28 electrons.

For more details regarding ions, visit:

https://brainly.com/question/14982375

#SPJ2

Answer:

A superposition says that the newest rocks are nearer to the surface and oldest are near the bottom

Answer:

A.

Explanation:

Work is said to be done if the force applied to a body causes the body to move through a distance.

Student B used more work and power

Workdone = Force * Distance

For student A:

Force = 3N

distance = 5meters

Time taken = 10 secs

Workdone by Student A = 3 * 5

Workdone by student A = 15Nm

Power used up = workdone/time

Power used up = 15/10

Power used up = 1.5 Watts

For student B:

Force = 6N

distance = 5meters

Time taken = 5 secs

Workdone by Student A = 6 * 5

Workdone by student A = 30Nm

Power used up = workdone/time

Power used up = 30/5

Power used up = 6 Watts

This shows that student B used more work and power

Learn more here: https://brainly.com/question/6701368