The titration of 25.00 ml a 0.125 m hclo4 solution requires 27.07 ml of koh to reach the endpoint. what is the concentration of the koh

To reach the equivalence point in the titration of 50.0 mL of 0.0998 M benzoic acid with 0.120 M NaOH, 41.58 mL of NaOH is required.

The student is asking how to calculate the volume of 0.120 M NaOH required to neutralize a given volume and concentration of benzoic acid in a titration process. Since benzoic acid is a monoprotic acid, it will react with NaOH in a 1:1 mole ratio.

To solve this, we use the formula:

molarity of acid (Macid) imes volume of acid (Vacid) = molarity of base (Mbase) imes volume of base (Vbase)

Substitute the known values into the equation to find the unknown volume of NaOH:

Macid = 0.0998 M

Vacid = 50.0 mL

Mbase = 0.120 M

Vbase = ?

Rearrange the equation to solve for Vbase:

Vbase = (Macid x Vacid) / Mbase

Vbase = (0.0998 M x 50.0 mL) / 0.120 M

Vbase = 41.58 mL

Therefore, 41.58 mL of 0.120 M NaOH is required to reach the equivalence point in the titration of 50.0 mL of 0.0998 M benzoic acid.

Answer: Option (A) is the correct answer.

Explanation:

When a substance absorbs heat energy then there will occur an increase in the temperature of the substance.

And, as there is occurring an increase in the temperature of substance. Kinetic energy is related to temperature as follows.

                   [tex]K.E \propto \frac{3}{2}kT[/tex]

Hence, with increase in temperature there will also be increase in kinetic energy of the molecules of a substance.

Thus, we can conclude that as temperature of this substance rises from [tex]20^{o}C[/tex] to [tex]50^{o}C[/tex], the substance absorbs heat and its kinetic energy increases.

Answer:

mutual fund is a correct answer.

Explanation:

Mutual fund is a form of investment which has the most amount of risk involved.

In Mutual fund the most amount of risk involved are:

Thus Mutual fund has the most amount of risk involved.

During the light reactions of photosynthesis, the energy from the sun is converted into few amounts of ATP and an energy carrier called NADPH. This is associated with the consumption of water and release of oxygen. So from the choices above, the correct answers are:

The light reactions of photosynthesis use water and produce nadph.

Answer:

Correct options:

Organic compounds can be synthesized in a laboratory setting.

There are hundreds of thousands of organic compounds.

Explanation:

1) Organic compounds are only found in living things: False

Organic compounds are mainly carbon based. Although organic compounds are derived from living things like plants and animals, non-living things like sedimentary rocks are also rich in carbon.

2) Organic compounds can be synthesized in a laboratory setting: True

There are four major categories of organic compounds: carbohydrates, proteins, lipids and nucleic acids all of which can be synthesized in a laboratory.

3) Organic compounds contain carbon: False

Organic compounds are identified by the presence of both carbon and hydrogen (and sometimes other elements like O, N, S).

4)CO2 is an organic compound: False

There are no H atoms, hence CO2 is not organic.

5) There are hundreds of thousands of organic compounds: True

Final answer:

Polar molecules align themselves in an electric field, with their positive ends facing the negative plate and their negative ends facing the positive plate, to maximize attraction between opposite charges.

Explanation:

Response to Polar Molecules in an Electric Field

When an electric field is applied to a very polar molecule, the molecules will align themselves with the field. A polar molecule has a permanent dipole moment due to an uneven distribution of positive and negative charges. In the absence of an electric field, these molecules are randomly oriented, and thus have no net effect. However, in the presence of an electric field, they orient themselves so that the positive end of each molecule is attracted to the negative plate, and the negative end is attracted to the positive plate. This alignment occurs because polar molecules want to maximize the attraction between opposite charges induced by the electric field, effectively creating a net dipole moment density per unit volume.

Polar molecules like HF will align to their dipoles with the field direction, demonstrating this behavior. The same effect can be observed with nonpolar molecules; while they do not have a permanent dipole moment, they can acquire an induced electric-dipole moment when subjected to an electric field, which also aligns with the field direction.

Explanation:

It is known that a brick has the shape of a rectangle. And formula to calculate the volume of a rectangle is as follows.

                     Volume of rectangle = length × height × width

Since, it is given that length is 25 cm, height is 5 cm and width is 15 cm. Therefore, calculate the volume of brick as follows.

                 Volume of brick = length × height × width

                                             = 25 cm × 5 cm × 15 cm

                                             = 1875 [tex]cm^{3}[/tex]

Hence, we can conclude that volume of the brick is 1875 [tex]cm^{3}[/tex].

When metals and non metals combine in fixed proportion then a chemical compound is formed. To gain stability and octet, halogens readily react with the alkali metals to form salts.

.

Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion. the overall charge of the molecule is zero that is molecule is neutral. The overall charge of the molecule is zero that is molecule is neutral.

The electronic configuration of halogen is ns²np⁵ and the electronic configuration of Alkali metals are ns¹. As halogens are very electronegative atom it can gain electrons from the alkali metals to complete its octet and hence gain stability.

Therefore, to gain stability and octet, halogens readily react with the alkali metals to form salts.

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The heat released by one mole of propane gas is given, -2221 kJ. Thus 400 g or 9 moles of propane gas will release - 20190 kJ of heat energy.

Combustion is the reaction of a substance with atmospheric oxygen to produce water and carbon dioxide. The process release heat energy since combustion reactions are exothermic.

It is given that one mole of propane gas produces - 2221 kJ.

molar mass = 44 g/mol

number of moles in 400 g = 400 /44 = 9 moles.

One mole of propane gas when combines with excess oxygen produces - 2221 kJ of energy. Hence, heat released by 9 moles is calculated as follows:

The heat released from 9 moles = 9 ×  - 2221 kJ = - 20190 kJ.

Therefore, enthalpy change in the combustion of 400 g of propane is - - 20190 kJ.

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Answer: Option (b) is the correct answer.

Explanation:

When we heat a solid substance at high temperature then it changes into liquid state and then into gaseous state.

For example, when water is heated above 100 degree celsius then it changes into vapors.

When low pressure is provided to a gas then its molecules are able to move easily from one place to another.

Therefore, a gas is most likely to exist at high temperature and low pressure.

The amount of energy released when one gram of oil is burned is[tex]\boxed{{\text{6}}{\text{.12 kJ}}}[/tex].

Further explanation

Heat capacity is defined as the amount of heat required to change the temperature of a pure substance by one degree. Its S.I. unit is J/K.

Molar heat capacity is defined as the amount of heat required to raise the temperature of one mole of substance by one degree. Specific heat capacity is defined as the amount of heat needed to increase the temperature of 1 gram of a pure substance by one degree.

The expression to calculate amount of heat released or absorbed as follows:

[tex]{\text{q}}={\text{mC}}\Delta{\text{T}}[/tex]                                       …… (1)

Here, q is the amount of heat.

m is the mass of substance.

C is specific heat.

[tex]\Delta{\text{T}}[/tex]is change temperature.

Calorimeter is the device that measures the change in amount of heat absorbed or released during chemical reaction followed by change in temperature. Bomb calorimeter is the device which measure the amount of heat absorbed or released during chemical reaction at constant volume.

The formula to calculate the amount of heat change in calorimeter is as follows:

[tex]{{\text{q}}_{{\text{calorimeter}}}}={{\text{C}}_{{\text{calorimeter}}}}\times\Delta{{\text{T}}_{{\text{calorimeter}}}}[/tex]              …… (2)

The expression to calculate amount of heat absorbed by water is as follows:

[tex]{\text{q}}=\left({{{\text{m}}_{{\text{water}}}}}\right)\left({{{\text{C}}_{{\text{water}}}}}\right)\left({\Delta{\text{T}}}\right)[/tex]                                                …… (1)

Given, [tex]{{\text{C}}_{{\text{water}}}}[/tex] is 4.184 [tex]{\text{J/g}}\cdot^\circ{\text{C}}[/tex].

[tex]{{\text{m}}_{{\text{water}}}}[/tex]is 1 kg.

Change in temperature [tex]\left({\Delta{\text{T}}}\right)[/tex]is [tex]5\;^\circ{\text{C}}[/tex].

Substitute the value of [tex]{{\text{C}}_{{\text{water}}}}[/tex], [tex]{{\text{m}}_{{\text{water}}}}[/tex] and [tex]\Delta{\text{T}}[/tex]in equation (1).

[tex]\begin{aligned}{{\text{q}}_{{\text{water}}}}&=\left({{\text{1}}\;{\text{kg}}}\right)\left({\frac{{1000\;{\text{g}}}}{{{\text{1}}\;{\text{kg}}}}}\right)\left({\frac{{{\text{4}}{\text{.184 J}}}}{{{\text{g}}\cdot ^\circ{\text{C}}}}}\right)\left({5\;^\circ{\text{C}}}\right)\\&{\text{=20920 J}}\\\end{aligned}[/tex]

The amount of heat absorbed by water is 20920 J.

The value of [tex]{{\text{C}}_{{\text{calorimeter}}}}[/tex]is[tex]0.10\;{\text{kJ/}}^\circ{\text{C}}[/tex].

The value of [tex]\Delta{{\text{T}}_{{\text{calorimeter}}}}[/tex]is [tex]{5^\circ}{\text{C}}[/tex].

Substitute these values in equation (2).

[tex]\begin{aligned}{{\text{q}}_{{\text{calorimeter}}}}&=\left({\frac{{0.10\;{\text{kJ}}}}{{^\circ{\text{C}}}}}\right)\times 5\;^\circ{\text{C}}\\&={\text{0}}{\text{.50 kJ}}\\\end{aligned}[/tex]

Amount of heat absorbed by calorimeter is[tex]{\mathbf{0}}{\mathbf{.50 kJ}}[/tex].

The formula to calculate the total amount of heat released to burn 3.5 g of sample is as follows:

[tex]- {{\text{q}}_{{\text{rxn}}}}={{\text{q}}_{{\text{water}}}}+{{\text{q}}_{{\text{calorimeter}}}}[/tex]                   …… (3)

Substitute 20920 J for [tex]{{\text{q}}_{{\text{water}}}}[/tex] and 0.50 J for [tex]{{\text{q}}_{{\text{calorimeter}}}}[/tex] in equation (3)

[tex]\begin{aligned}-{{\text{q}}_{{\text{rxn}}}}&=20920{\text{ J}}+{\text{0}}{\text{.50 kJ}}\left({\frac{{1000\;{\text{J}}}}{{{\text{1}}\;{\text{kJ}}}}}\right)\\&={\text{21420 J}}\\\end{aligned}[/tex]

The total amount of energy released to burn 3.5 g of oil is 21420 J.

The amount of energy released to burn 1 g of oil is calculated as follows:

[tex]\begin{aligned}{\text{Energy released per gram}}&=\frac{{21420{\text{ J}}}}{{3.5{\text{ g}}}}\\&={\text{6120 J}}\\\end{aligned}[/tex]

The conversion factor to convert energy from J to kJ is as follows:

[tex]1{\text{ kJ}}={\text{1000}}\;{\text{J}}[/tex]

The amount of energy released after one gram of oil gets burned is calculated as follows:

[tex]\begin{aligned}{\text{Energy released per gram}}\left({{\text{kJ}}}\right)&=\left({{\text{1 kJ}}}\right)\left({\frac{{{\text{6120 J}}}}{{{\text{1000J}}}}}\right)\\&={\text{6}}{\text{.12 kJ}}\\\end{aligned}[/tex]

Hence, [tex]{\mathbf{6}}{\mathbf{.12 kJ}}[/tex] of energy is released when one gram of oil is burned.

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Answer details:

Grade: Senior school.

Subject: Chemistry.

Chapter: Thermodynamics

Keywords: Heat capacity, molar heat capacity, specific heat capacity, released, absorbed, calorimeter, bomb calorimeter, water, mass, temperature, degree, 6.12 kj, 6120 j, 0.50 and 2120 J.

The heat released per gram of oil shale is 6120 J/g.

To determine the heat released per gram of oil shale, calculate the heat absorbed by both the water and the calorimeter, then divide the total heat by the mass of the oil shale.

To determine how much heat is released per gram of oil shale when it is burned, follow these steps:

First, calculate the heat absorbed by the water.

Thus, q water = 1000 g * 4.184 J/g°C * 5.0°C = 20920 J.

Next, calculate the heat absorbed by the bomb calorimeter.

Then, calculate the heat (q calorimeter) absorbed by the calorimeter:

Add the heat absorbed by the water and the calorimeter to get the total heat released by the combustion of the oil shale:

Finally, determine the heat released per gram of oil shale by dividing the total heat by the mass of the oil shale:

Therefore, the heat released per gram of oil shale is 6120 J/g.

Correct question is: A 3.5-g sample of colorado oil shale is burned in a bomb calorimeter, which causes the temperature of the calorimeter to increase by 5.0°c. the calorimeter contains 1.00 kg of water (heat capacity of H₂O = 4.184 j/g°c) and the heat capacity of the empty calorimeter is 0.10 kj/°c. how much heat is released per gram of oil shale when it is burned?

Answer:

AB negative.

Explanation:

Four major types of blood group found in humans are A, B, AB and O. The rhesus factors determines whether the blood group is positive or negative. Karl Landsteiner explained the different types of blood group.

The blood test shows clumping in the wells with  anti-A and anti-B antibodies. The blood group is AB because AB blood group has both the antigens A and B, shows clumping in both the anti-A and anti-B antibodies. The rhesus test is negative indicates that the blood type is negative as the rhesus protein is absent on the surface of blood cells. Hence, the individual has AB- blood type.

Thus, the correct answer is option (4).

Answer:

AB -

Explanation:

took it

Answer:

B. a pipette

Explanation:

on edg 2021

In chemical reactions, nonmetals generally gain electrons to form negatively charged ions called anions, achieving a stable electronic state like the next noble gas.

When nonmetals form ions, they typically gain electrons to form negatively charged ions known as anions. This process results in nonmetals achieving a stable electronic configuration that is similar to the one of the next noble gas in the periodic table.

Nonmetals, particularly those in groups 16 and 17, and to a lesser extent those in Group 15, have a high electronegativity which drives them to gain electrons and form anions such as the chloride ion (Cl-), the nitride ion (N3-), and the selenide ion (Se2-). Unlike metals that typically lose electrons to form cations, nonmetals do not form monatomic positive ions (cations) in normal chemical processes due to their high ionization energies.

The difference between mass and time is the influence of the earth's gravitational force on objects

In general, some people equate mass and weight.

Mass is one of the principal quantities, which is related to the matter in the matter, whereas weight is a force that leads to the center of the earth which is subject to the earth to matter (Earth's gravitational force)

So that the mass does not depend on the location of the object, while the weight can change depending on the position of the object

In international standards, the mass unit is kg while the weight is in units of newton

1 kg itself is the mass of a cylinder made of platinum-iridium

While the standard mass of an atom is determined according to the carbon-12 atomic mass of 12 atomic mass units

1 atomic mass unit comparable to 1.6605402.10-17 kg

Measuring the atomic mass using a mass spectrometer.

The mass itself can be measured by the arm balance while the weight is measured by the spring balance

One equation that can relate mass and force (weight) is

W = m.g

W = weight, N

m = mass, kg

g = gravity acceleration, m / s2

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The number of electrons required to complete the outer energy level of the phosphorus atom has been 3.

Phosphorous has been Group 15 nonmetal. The atomic number of phosphorus has been 15.

The electronic configuration has been assigned to fill the subshells. The electronic configuration of Phosphorus has been:

2, 8, 5

The third shell of atoms has 8 electrons. In the third shell of phosphorus, the number of electrons is 5.

In order to complete the outer energy level, the number of electrons required are:

8 = 5 + electrons required

Electrons required = 8 - 5

Electrons required = 3

The number of electrons required to complete the outer energy level of the phosphorus atom has been 3.

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