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Answer:

11.0 L

Explanation:

The equation for this reaction is given as;

2H2  +  O2  -->  2H2O

2 mol of H2 reacts with 1 mol of O2 to form 2 mol of H2O

At STP;

1 mol = 22.4 L

This means;

44.8 L of H2 reacts with 22.4 L of O2 to form 44.8 L of H2O

In this reaction, the limiting reactant is H2 as O2 is in excess.

The relationship between H2 and H2O;

44.8 L = 44.8 L

11.0 L would produce x

Solving for x;

x = 11 * 44.8 / 44.8

x = 11.0 L

Answer:

We will have zero bonds

Explanation:

In this case, we have to start with the structure of 4,5-diethyloctane. This name ends with the suffix "ane" therefore we have an alkane. All the alkanes are made with single bonds between carbons and single bonds between carbon and hydrogen.

The molecule will have a carbon chain of eight carbons and we will have 2 branches, one ethyl on carbon 4 and another ethyl on carbon 5. (see figure 1)

CaF2 will be more soluble at low pH than at high pH.

This is because the fluoride ion can react with the increased concentration of H+ ions present at low pH, forming HF and effectively increasing the solubility of CaF2.

CaF2(s) ⇌ Ca2+(aq) + 2F-(aq)

The solubility of CaF2 depends on the concentration of its constituent ions in solution, which is affected by the pH of the solution. The pH of a solution is a measure of its acidity or basicity and is determined by the concentration of H+ ions present in the solution.

At high pH, the concentration of H+ ions in the solution is low, which means that there are fewer H+ ions available to react with the F- ions produced by the dissociation of CaF2. Therefore, at high pH, the F- ions remain largely unchanged, and the solubility of CaF2 is relatively low.

However, at low pH, the concentration of H+ ions in the solution is high, which means that there are more H+ ions available to react with the F- ions produced by the dissociation of CaF2. The fluoride ion (F-) can react with the increased concentration of H+ ions to form hydrofluoric acid (HF):

F-(aq) + H+(aq) ⇌ HF(aq)

The formation of HF effectively removes F- ions from the solution, which shifts the equilibrium of the dissociation of CaF2 to the right, thereby increasing the solubility of CaF2.

Therefore, CaF2 will be more soluble at low pH than at high pH, because the fluoride ion can react with the increased concentration of H+ ions present at low pH, forming HF and effectively increasing the solubility of CaF2.

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Answer : A

0,15 moles of NaOH -------in-------1000ml

x moles of NaOH ---------in-------100ml

x= 0,015 moles of NaOH

final volume =150ml

0,015 moles of NaOH -------in------150ml

x moles of NaOH ------in--------1000ml

x= 0,1 moles of NaOH

Answer:

C- The core is made up of dense elements, such as iron and nickel.

The mass, of 752 atoms of lithium (Li) is 8.68 x 10^-22 grams, and Li has a mass of 6.94 g per mol.

The mass of 752 atoms of lithium can be calculated using the formula:

mass = number of moles x molar mass

To find the number of moles, we need to use Avogadro's number, which is the number of atoms in one mole of a substance. The number of atoms per mole is 6.022 x 1023.

To find the number of moles of lithium in 752 atoms, we can use the following formula:

Number of atoms / Avogadro's number equals the number of moles.

So, the number of moles of lithium in 752 atoms is:

752 atoms / (6.022 x 10^23 atoms/mol) = 1.25 x 10^-22 mol

Now we can use this number of moles to find the mass of lithium:

= mass

= 1.25 x 10^-22 mol x 6.94 g/mol

= 8.68 x 10^-22 g

So, the mass of 752 atoms of lithium is 8.68 x 10^-22 grams.

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Mass percentage is a term that represents the concentration, basically mass by mass percentage. It tells about the percentage of a component in a whole component. Thus, the mass percentage of water in given compound is 27.9%.

Mass percentage represents the the percentage of each element that is making a particular compound. Mass percentage does not have any unit as numerator and denominator contains the same unit.

Hydrated compound + Δ\(\rightarrow\) anhydrate compound +water

mass of hydrate compound =mass of anhydrate compound + mass of water

mass of hydrate compound=37.25 g

mass of anhydrate compound=26.81 g

37.25 g =26.81 g+ mass of water

mass of water=10.4g

Percentage of mass of water = (component’s mass ÷ total mass) x 100%

Percentage of mass of water = (10.4g ÷37.25 g) x 100%

                                                 =27.9%

Thus, the mass percentage of water in given compound is 27.9%.

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To answer this question, we need to use the concept of vapor pressure and the Clausius-Clapeyron equation. At 50°C, the vapor pressure of water is 12.3 kPa. When the water is introduced into the evacuated flask, it will start to evaporate until the pressure of the water vapor reaches 12.3 kPa, at which point the system will reach equilibrium.

Using the ideal gas law, we can calculate the number of moles of water vapor present in the flask when equilibrium is reached:

PV = nRT

where P is the vapor pressure of water (12.3 kPa), V is the volume of the flask (5.00 L), n is the number of moles of water vapor, R is the gas constant (8.31 J/mol*K), and T is the temperature in Kelvin (50°C + 273.15 = 323.15 K).

Solving for n, we get:

n = PV/RT
 = (12.3 kPa * 5.00 L) / (8.31 J/mol*K * 323.15 K)
 = 0.0211 mol

Since the total mass of water in the flask is 1.00 g, we can use the molar mass of water (18.02 g/mol) to calculate the mass of water vapor present:

mass of water vapor = n * molar mass of water
                         = 0.0211 mol * 18.02 g/mol
                         = 0.380 g

Therefore, the mass of water present as liquid when equilibrium is reached is:
mass of water liquid = total mass of water - mass of water vapor
                          = 1.00 g - 0.380 g
                          = 0.620 g

So 0.620 g of water is present as liquid when equilibrium is established.
When 1.00 g of water is introduced into a 5.00 L evacuated flask at 50°C, an equilibrium is established between the liquid water and its vapor. To determine the mass of water present as liquid at equilibrium, you'll need to use the vapor pressure of water at 50°C and the Ideal Gas Law.

At 50°C, the vapor pressure of water is approximately 12.3 kPa. The Ideal Gas Law equation is:

PV = nRT

Where:
P = pressure (in this case, the vapor pressure of water, 12.3 kPa)
V = volume of the flask (5.00 L)
n = moles of water vapor
R = gas constant (8.314 J/mol·K for SI units, but we will use 8.2057×10⁻³ L·kPa/mol·K to match the pressure and volume units)
T = temperature in Kelvin (50°C + 273.15 = 323.15 K)

Now, you can solve for n:

n = PV / RT
n = (12.3 kPa)(5.00 L) / (8.2057×10⁻³ L·kPa/mol·K)(323.15 K)
n ≈ 0.0235 mol

To find the mass of water vapor, multiply moles by the molar mass of water (18.015 g/mol):

mass_water_vapor = n × molar_mass
mass_water_vapor = 0.0235 mol × 18.015 g/mol
mass_water_vapor ≈ 0.423 g

Since 1.00 g of water was initially introduced, the mass of water present as liquid at equilibrium can be found by subtracting the mass of water vapor:

mass_water_liquid = initial_mass - mass_water_vapor
mass_water_liquid = 1.00 g - 0.423 g
mass_water_liquid ≈ 0.577 g

Therefore, at equilibrium, approximately 0.577 g of water is present as liquid in the flask.

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Based on the lab values provided, the answer would be D. The patient has been immunized against hepatitis B as indicated by the presence of HBsAB.

The absence of HBsAg and HBcAb suggest that the patient has not had a recent or current infection with hepatitis B. It is important to note that these lab values should be interpreted by a health care provider in the context of the patient's medical history and any additional lab or clinical findings.

HBcAb (-) means the patient does not have antibodies for the hepatitis B core antigen, suggesting no past infection. These results suggest that the patient has been immunized against hepatitis B.

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Interpreting these lab values for a 40-year-old patient with the given terms:

HBsAg (-), HBsAB(+), HBcAb(-)

a. the pt had hepatitis
b. the pt has hepatitis
c. the pt should consider immunization
d. the pt has been immunized

Your answer: d. the pt has been immunized.

HBsAg (Hepatitis B surface antigen) is negative, which indicates the patient does not have an active Hepatitis B infection.
HBsAB (Hepatitis B surface antibody) is positive, which suggests that the patient has developed immunity to Hepatitis B, either from previous exposure or immunization.
HBcAb (Hepatitis B core antibody) is negative, which means the patient has never been exposed to Hepatitis B.

Therefore, the interpretation of these lab values suggests that the patient has been immunized against Hepatitis B.

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Answer:

hope this is help helpful

Explanation:

natural gas are considered nonrenewable because they can not be replenished in a short period of time.

Answer: c extracting oil

Explanation:

Saudi Arabia is known for there huge oil market

Kilocalorie is a unit of measuring the amount of energy of a reaction, but this is not the only unit, we can also have Joules as a unit, and the conversion is:

1 Kcal = 4184 Joules

Therefore if we have 3.25 Kcal, we will have:

3.25 * 4184 = 13600 Joules of energy, therefore letter D

According to the graph, the concentration of A decreases with time before leveling out. Option A.

The reaction shown is that of a reversible reaction in which A is on the reactant's side and A2 is on the product's side.

At the beginning of the reaction, the concentration of A decreases as a result of forming A2. In other words, the concentration of A2 increases just as that of A decreases.

With time, the reaction reaches an equilibrium during which the rate of formation of A equals the rate of formation of A2. At this point, the concentration of A levels off.

In summary, the concentration of A first decreases before leveling off.

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The malate dehydrogenase reaction is a part of the citric acid cycle. Given the concentrations provided ([malate] = 1.31 mM, [oxaloacetate] = 0.290 mM, [NAD+] = 170 mM, [NADH] = 68 mM) and the standard free energy change (ΔG°' = 29.7 kJ/mol), we can calculate the free energy change (ΔG) for this reaction at 37°C (310 K) using the equation:
ΔG = ΔG°' + RT ln ([oxaloacetate][NADH])/([malate][NAD+])
Where R is the gas constant (8.314 J/mol·K) and T is the temperature (310 K). Plugging in the given values, we can find the free energy change for this reaction at the specified conditions. Therefore, the free energy change for the malate dehydrogenase reaction at pH 7 and 37.0°C, with the given concentrations, is 57.6 kJ/mol.

The malate dehydrogenase reaction is a crucial step in the citric acid cycle, converting malate and NAD+ to oxaloacetate and NADH. To calculate the free energy change for this reaction, we can use the equation:
ΔG°' = -RTln(Keq)
Where R is the gas constant (8.314 J/mol*K), T is the temperature in Kelvin (310 K), and Keq is the equilibrium constant for the reaction.
To calculate Keq, we need to use the concentrations given in the problem:
Keq = ([oxaloacetate] * [NADH])/([malate] * [NAD+])
Plugging in the given concentrations, we get:
Keq = (0.290 * 68)/(1.31 * 170) = 0.00588
Now we can calculate ΔG°' using the first equation:
ΔG°' = -RTln(Keq) = - (8.314 J/mol*K) * (310 K) * ln(0.00588) = 44.2 kJ/mol
However, the given value for ΔG°' is 29.7 kJ/mol. To calculate the actual free energy change for the reaction at the given concentrations, we can use the equation:
ΔG = ΔG°' + RTln(Q)
Where Q is the reaction quotient, which is calculated using the same equation as Keq, but with the actual concentrations instead of the equilibrium concentrations.
Plugging in the given concentrations, we get:
Q = (0.290 * 68)/(1.31 * 170) = 0.00588
Now we can calculate ΔG:
ΔG = 29.7 kJ/mol + (8.314 J/mol*K) * (310 K) * ln(0.00588) = 57.6 kJ/mol
Therefore, the free energy change for the malate dehydrogenase reaction at pH 7 and 37.0°C, with the given concentrations, is 57.6 kJ/mol.
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This is not the best way to organize a periodic table because two elements might have similar atomic mass.

Periodic table is a chart in which arrangement of chemical elements are done.

In the early periodic table elements are arranged on the basis of their atomic masses, while after sometime Moseley arranged the periodic table on the basis of atomic number as he proposed that properties of an element is justified on the basis of number if electrons.

And mass of two substances may be same so it is difficult to differentiate between them.

Hence, two elements might have similar atomic mass.

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A "collage model" typically refers to a two-dimensional artwork created by combining different materials, such as photographs, paper, fabric, and other found objects, to create a new image. Collage is a technique widely used in art and design, particularly in fields such as graphic design, advertising, and illustration.

On the other hand, a "three-dimensional model" refers to a physical object that has height, width, and depth, also known as 3D. It can be made of different materials, such as wood, plastic, metal, or even digital models using computer software. Three-dimensional models are used in many fields, such as architecture, engineering, product design, and entertainment.

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Given that the density of salt water is  1.027 g/ml, the unknown solid would sink in water.

We know that the density is referred to as the ratio of the mass to the volume of an object. This implies that if the density of an object is less than the density water then the object would float in water. On the contrary, if the density of an object is greater than that of water, the object would sink in water.

We can see from the table that;

Average mass of thee object = 57.1 + 57.4 + 53/3 = 55.8 g

Average volume of the object = 37 + 36 + 36.5/3 = 36.5 mL

Density of the solid = 55.8 g/36.5 mL

= 1.5 g/mL

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The half-life for the decomposition of substrate 1 when the initial concentration is 2.01 M cannot be determined from the given data.

The half-life of a reaction is the time it takes for the concentration of the reactant to decrease by half. In this case, we are given the initial rate data for the decomposition of substrate 1 at different concentrations, but we don't have information on the rate of change of concentration over time.

To determine the half-life, we need to observe the decrease in concentration over a period of time and calculate the time it takes for the concentration to decrease by half. However, the given data only provides information about the initial rates of the reaction at different substrate concentrations, which is not sufficient to determine the half-life.

To determine the half-life, additional data points with corresponding concentrations and reaction times would be required. With such data, we could plot a graph of concentration versus time and determine the time it takes for the concentration to reach half of its initial value.

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Answer:

C

Explanation:

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 8 × 15

We have the final answer as

Hope this helps you

The Percent yield of potassium alum is 56.44.

When we conduct an experiment in lab prior to the experiment the yield of the reaction is calculated and that is called as the theoretical yield. But when the experiment is completed the yield that we get is not the same as the calculated yield and the yield that we called is the experimental yield. To find out the what percentage of reaction is completed we usually divide the experimental yield by the theoretical yield and multiply it by 100, this gives us Percent yield of the reaction

Usually, percent yield is lower than 100% because the actual yield is often less than the theoretical value. Reasons for this may include incomplete or also competing reactions and loss of sample during recovery or t can also be due to some human error as well. It's possible for percent yield to be over 100%, which means more sample was recovered from a reaction than predicted.

According to the formula we can calculate the percent yield of Potassium alum to be

=   0.92 × 100

     1.63

= 56.44.

Hence the Percent yield of potassium alum is 56.44

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Water molecules are attracted to the molecules in the wall of the glass beaker. And since water molecules like to stick together, when the molecules touching the glass cling to it, other water molecules cling to the molecules touching the glass, forming the meniscus.

Every molecule has a shape. Some are shaped like the letter V, and some are trigonal. The shape of a molecule can be determined by the Valance Shell Electron Pair Repulsion Theory (VSEPR).

VSEPR theory is a theory that can describe the shape of electrons in three dimensions according to the repulsion of pairs of valence electrons and also free electrons.

This repulsion produces angles between the electrons that make up the molecule. VSEPR theory relies on the Lewis structure as the basis for determining lone and bond pairs. The repulsion of free electrons is greater than the repulsion between free electrons and bound electrons.

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The mass  (g) of a 257 ml sample with a specific gravity of 1.75 is 449.75

Calculation ,

The Formula of specific gravity ( when density of the water is 1g/ml ) is given as ,

specific gravity = density of an object

Density of an object can be computed using the formula :

Density = mass/ volume

Specific gravity = mass/volume

From there we can drive a formula for mass by transposing volume to the other side of the equation ,

volume × specific gravity = mass  

mass =  1.75 × 257 ml = 449.75 gram

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Looking at the absorption Spectra of cranberry juice and apple juice the color and part of the visible spectrum that are absorbed as well as how the colors that are not absorbed contributed to the the colors of the cranberry juice and apple juice are;

When the light actually hits on a surface,it is only a part of it that is reflected to the eyes whereas the rest of the spectrum is then absorbed by the object.

However,if the red wavelength is reflected,you will see the red color,but if all the spectrums are absorbed,you will see the black color,if then all the spectrums is reflected,you will see the white color.

When the light hits the surface, just a part will be reflected in the eyes of the person.

From the complete information, when an individual looks at the absorption spectra of cranberry juice and apple juice, just a part will be seen.

When the light hits the surface, there'll be a reflection in the eyes of the person as just a part will be reflected. The rest of the spectrum will be absorbed by the object.

Also, if the red wavelength is reflected, then one will see the red color. When all the spectrum is absorbed, one will see the black color. Lastly, when all the spectrum is reflected, one will see the white color.

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sea water contains roughly 35 g of nacl per liter The molarity of sodium chloride in sea water is 0.48 M NaCl.

Molarity (M), which is calculated by divided the solute's weight in moles by the the solution's volume in litres, the most commonly utilized unit to describe concentration of the solution: litres of solution/moles of solute equals M. One litre of a solution with a 1.00 molar concentration (1.00 M) contains 1.00 moles of solute. As according statistics, molarity is: Molarity seems to be the sum of the solute's moles. litres of the water. Since the volume of the solution will be determined in litres and the number of moles of solute is estimated in mol. So, mol L – 1 is the unit of molarity.

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cde PLZ BRAINLEST PLZ

Answer:

I am not sure but I think it is D

Brainliest please ;-)