An analytical chemist is titrating 212.7 mL of a 0.6800 M solution of hydrazoic acid (HN3) with a 0.2900 M solution of KOH. The p Ka of hydrazoic acid is 4.72. Calculate the pH of the acid solution after the chemist has added 571.6 mL of the KOH solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of KOH solution added. Round your answer to 2 decimal places.

The total pressure of a gaseous mixture that contains three gases with partial pressures is 972 torr.

When more than one gas is present in a container, each gas exerts pressure, which is known as partial pressure. Its partial pressure refers to the pressure of any gas inside the container.

According to Dalton's Law, also known as the Law of Partial Pressures, the combined pressure of a mixture of gases is equal to the sum of their individual partial pressures.

1 - 0.845 atm - 0.854 atm x 760 Torr/atm = 642 torr

2 - 120 torr

3 - 210 mmHg - 1 mmhg is almost equivalent to 1 torr - therefore its 210 torr

total pressure - 642 + 120 + 210 = 972 torr

To know more about partial pressure visit the link:

https://brainly.com/question/13199169?referrer=searchResults

#SPJ4

Answer:

i do not now

Explanation:

The molar mass and mass of each element in a mole of the compound are both solved for in the Mass Percent formula.  Mass Percentage = (Mass of Solute / Mass of Solution) × 100

What does "Mass Percent" mean?

A component in a particular combination or a concentration can be described using the mass percent symbol. The mass of solute contained in a specific mass of solution is indicated by the mass percentage used to characterize the solution composition. The concentration of the solute is expressed in terms of mass or moles. By multiplying the grammes of solute per gramme of solution by 100, the mass percent of a solution can be computed.

The molar mass and mass of each element in a mole of the compound are both solved for in the Mass Percent formula. The mass proportion of each element can be determined using these masses.

(Mass of Solute / Mass of Solution) × 100 Equals Mass Percentage

Example: The process of making an aqueous solution of sodium chloride (CaCl₂). Determine how much calcium chloride, in the form of a 5%(m/m) solution, can be generated from 100 g of the chemical.

To know about percent by mass, visit: https://brainly.com/question/14990953

#SPJ4

The rf value for a spot in a chromatography experiment if the solvent moved 13.1 cm and the spot moved 9.5 cm from the origin is 0.73.

What is chromatography ?

Separating ingredients in a mixture using chromatography is a procedure. The mixture is dissolved in the mobile phase, which starts the process off, and then transports it through the stationary phase, which is the final phase.

What is experiment ?

A scientific experiment is a test carried out to ascertain what occurs to a subject under a given set of circumstances.

Therefore,  rf value for a spot in a chromatography experiment if the solvent moved 13.1 cm and the spot moved 9.5 cm from the origin is 0.73.

Learn more about chromatography  from the given link.

https://brainly.com/question/11960023

#SPJ4

Answer:

added to what? base? if its added to base then it will increase in pH. H2S04(sulphuric acid is strong) so the pH is ard 3

If a titration net volume should be 20. 00 ml and a student accidentally goes one drop past the endpoint (~0. 05 ml),then the percent error is 0.25%.

Percent error is defined as the difference of experimental value and theoretical value and measures the accuracy of the result found. The greater the error, lesser is the accuracy and vice versa.

Vd = 1mL/20 drops

where,

Vd is volume of one drop

Vd = 0.05mL

Error is defined as the ratio of change in volume divided by real volume.

e(%) = {(Vr-Vt) /Vt}×100

where,

Vr = real volume

Vd = theoretical volume

e(%) = {((20+0.05) -20) /20} × 100

e(%) = 0.25%

Thus, we find that the percent error on adding one drop is 0.25%.

learn more about percent error:

https://brainly.com/question/3105259

#SPJ4

21.3 days will be taken to consume 1000kg glucose.

Fermentation is an alcoholic process where 1 molecule of glucose is converted to 2 molecules of CO2 and 2 molecule of ethanol/ethyl alcohol.

Fermentation takes place in absence of oxygen, which means in anaerobic conditions.

It takes place in presence of enzyme zymase.

The formula for alcoholic fermentation,

C6H12O6 -> 2C2H5OH + 2CO2

From the data given,  we know

5 hr. = 8 kg alcohol.

Days to consume = 1000 kg glucose.

Mol ethanol:

5000/46 = 108.7 moles.

1/2 X 108.7 = 54.35

hence, 54.35 moles are produced in 5 hours.

moles of 1000kg of glucose:

10⁶g/180g/mol = 5555.5 moles.

so for 5555.5 moles the days we need is

5555.5/54.35 X 5 hours

= 511.085h

= 21.3 days.

To know more about alcoholic fermentation,

https://brainly.com/question/20662833

#SPJ4

When 156.32 g of barium hydroxide is reacted, approximately 142.34 g of aluminum hydroxide can be produced, based on the balanced chemical equation and stoichiometry.

To determine the amount of aluminum hydroxide that can be produced when 156.32 g of barium hydroxide is reacted, we need to consider the balanced chemical equation for the reaction and use stoichiometry.

The balanced chemical equation for the reaction is:

Ba(OH)2 + 2AlCl3 → 2Al(OH)3 + 3BaCl2

From the balanced equation, we can see that for every 1 mole of Ba(OH)2, 2 moles of Al(OH)3 are produced.

First, we need to calculate the number of moles of barium hydroxide (Ba(OH)2) in 156.32 g:

Molar mass of Ba(OH)2 = (137.33 g/mol + 2(16.00 g/mol + 1.01 g/mol)) = 171.34 g/mol

Moles of Ba(OH)2 = mass / molar mass = 156.32 g / 171.34 g/mol = 0.911 mol

Now, using the stoichiometry of the balanced equation, we can determine the moles of aluminum hydroxide (Al(OH)3) produced:

Moles of Al(OH)3 = 2 × Moles of Ba(OH)2 = 2 × 0.911 mol = 1.822 mol

Finally, to convert the moles of aluminum hydroxide to grams, we need to multiply by the molar mass of Al(OH)3:

Molar mass of Al(OH)3 = (26.98 g/mol + 3(16.00 g/mol + 1.01 g/mol)) = 78.00 g/mol

Mass of Al(OH)3 = Moles of Al(OH)3 × molar mass = 1.822 mol × 78.00 g/mol = 142.34 g

Therefore, when 156.32 g of barium hydroxide is reacted, approximately 142.34 g of aluminum hydroxide can be produced.

For more such questions on barium hydroxide visit;

https://brainly.com/question/29344018

#SPJ8

The metabolic pathway by which glucose is synthesized from non-carbohydrate precursors such as amino acids, lactate, or glycerol is known as gluconeogenesis. This process occurs primarily in the liver.

When the intake of dietary is insufficient or absent, gluconeogenesis provides glucose. It is also required for the maintenance of acid-base balance, amino acid metabolism, and the synthesis of carbohydrate-derived structural components.

Glycolysis has three irreversible steps:

1. Hexokinase/Glucokinase: This enzyme catalyzes the first step of glycolysis, the phosphorylation of glucose to glucose-6-phosphate.

2. phosphofructokinase-1: This enzyme catalyzes the third step of glycolysis by converting fructose-6-phosphate to fructose-1,6-bisphosphate.

3. Pyruvate kinase: This enzyme catalyzes the final step of glycolysis, the conversion of phosphoenolpyruvate to pyruvate.

Glycogen phosphorylase, phosphorylase kinase, and phosphoglucomutase are key enzymes in glycogenolysis.

To know more about the gluconeogenesis visit:

https://brainly.com/question/30908065

#SPJ1

The rate constant for the first-order decomposition of H2O2 with a half-life of 660 minutes is approximately \(0.00105 min^(-1).\)

To find the rate constant for the first-order decomposition of H2O2 with a half-life of 660 minutes, you can use the following formula:
rate constant (k) = ln(2) / half-life

Step 1: Plug in the given half-life value.
k = ln(2) / 660 minutes

Step 2: Calculate the rate constant.
\(k ≈ 0.00105 min^(-1)\)
So, the rate constant for the first-order decomposition of H2O2 with a half-life of 660 minutes is approximately 0.00105 min^(-1).

To know more about first-order decomposition :

https://brainly.com/question/4288256

#SPJ11

The molecular formula of the compound is C₆H₁₂O₆.

The molecular formula of a compound is determined by dividing the molar mass of the compound by the empirical formula mass. The empirical formula mass is the sum of the atomic masses of the elements in the empirical formula.

To determine the molecular formula of the compound, we first need to find the empirical formula mass. This can be done by using the atomic masses of the elements in the compound and multiplying them by the number of atoms of each element in the empirical formula.

For example, if the empirical formula of the compound is CH₂O, the empirical formula mass would be:

C: 12.01 g/mol x 1 = 12.01 g/mol
H: 1.01 g/mol x 2 = 2.02 g/mol
O: 16.00 g/mol x 1 = 16.00 g/mol

Empirical formula mass = 12.01 g/mol + 2.02 g/mol + 16.00 g/mol = 30.03 g/mol

Next, we can divide the molar mass of the compound by the empirical formula mass to find the molecular formula:

Molecular formula = Molar mass / Empirical formula mass
Molecular formula = 180.15 g/mol / 30.03 g/mol
Molecular formula = 6

Therefore, the molecular formula of the compound is 6 times the empirical formula, or C₆H₁₂O₆.

So, the molecular formula of the compound is C₆H₁₂O₆.

To know more about molecular formula refer here:

https://brainly.com/question/28647690#

#SPJ11

Answer:

First, I will convert from grams to moles. This will give me approximately 4.032 moles of carbon, 6.740 moles of hydrogen, and 3.344 moles of oxygen. Then, I will calculate the mole ratio, using whole numbers. I must also identify the least amount of moles in an element for this step, which is oxygen at 3.344 moles.

Oxygen = 3.344/3.344 = 1

Carbon = 4.032/3.344 = 1

Hydrogen = 6.740/3.344 = 2

The empirical formula will be COH2.

Now that we have the molar mass of the molecular formula, we can calculate for the molecular formula. First, we will begin by discovering the molar mass of the empirical formula, which will be C molar mass x 1 + O molar mass x 1 + H molar mass x 2. That will be equal to 60.949. After that, we can divide the molecular mass by the empirical formula molar mass, giving us approximately 3. Now we will multiply the empirical formula by 3, giving us our molecular formula, which will be equal to C3O3H6.

Answer: It supplies water to nearly half of US households.

Answer:

Rubber, plastic,candle wax, graphite glass

Explanation:

they all lack internal structure

The solids are characterized as amorphous and crystalline solids based on the arrangement of atoms. The solids that are amorphous are rubber, plastic, candle wax, and glass.

The solids have the arrangement of atoms in the lattice. The solids with an appropriate arrangement of atoms are crystalline solids. For example, sugar, graphite.

The solids with irregular arrangements of atoms in the lattice are amorphous solids. For example, glass, rubber.

Thus, the solids that are amorphous in nature are rubber, plastic, candle wax, and glass.

Learn more about amorphous solids, here:

https://brainly.com/question/4626187

The stomach's capacity and the efficiency of the digestive system are two factors that can limit the amount of food that can be consumed and absorbed.

One factor that limits the amount of food that can be consumed and absorbed is the capacity of the stomach. The stomach has a finite volume and can only expand to a certain extent. Once it reaches its capacity, it sends signals to the brain to indicate fullness, leading to a decrease in appetite and a natural limitation on food intake.Another factor is the efficiency of the digestive system. The small intestine is responsible for absorbing nutrients from food.

If there is a decrease in the surface area of the small intestine due to certain conditions or diseases, such as Crohn's disease or celiac disease, the absorption of nutrients may be impaired, resulting in limited nutrient uptake from food. It's important to note that there are other factors, such as individual metabolism, hormone regulation, and psychological factors, that can also influence food consumption and absorption.  

To know more about stomach's  visit:-

https://brainly.com/question/19098210

#SPJ11

During the research, the scientists collect the details and observations based on the information called data. Thus, option A is accurate.

A data is set of facts and observations including textual information, graphs, images, etc. It includes all the measurements and observations collected during the research work. The hypothesis is a thesis statement or a theory.

Observation in research is the gained information and facts during the research process that involves the recording of the data using some sort of tools. While variable is the set that can vary or change.

Therefore, the correct option is A. data.

Learn more about data here:

https://brainly.com/question/1362152

#SPJ1

If one form of a gene can mask the appearance of another form, that form is considered dominant over the other form. Option B.

According to Mendel, genes are usually made up of 2 alleles. These alleles can be the same or different. When the alleles are the same, the gene is said to be homozygous. If the alleles are different, the gene is said to be heterozygous.

When the two alleles that make up a gene are different, one will be dominant and the other will be recessive. The dominant gene masks the effect of the recessive gene. In other words, the recessive gene cannot be expressed as long as it coexists with the dominant gene. In order for it to be expressed, it has to be in two copies or a homozygous recessive form.

For the dominant allele, however, only one copy is needed for it to be expressed.

In summary, if one form of a gene can mask the appearance of another form, that form is considered dominant over the other form.

More on genes can be found here: https://brainly.com/question/5519888

#SPJ1

Answer:

a chemical change

Explanation:

a physical change is mostly identified even without indicators i.e candle wax about forming a new acid or base I guess we have to include a ph scale to ascertain since the salt can be acidic but not necessarily an acid

Answer: The answer is A, a chemical change has occurred

Explanation:

I’m just a jenious

The molar mass of potassium permanganate (\(KMnO_4\)) is 158.03 g/mol, and it is a dark purple compound.

Potassium permanganate (\(KMnO_4\)) is a chemical compound that consists of one potassium (K) atom, one manganese (Mn) atom, and four oxygen (O) atoms. To determine the molar mass of potassium permanganate, we add up the atomic masses of these elements.

The atomic mass of potassium (K) is approximately 39.10 g/mol, the atomic mass of manganese (Mn) is approximately 54.94 g/mol, and the atomic mass of oxygen (O) is approximately 16.00 g/mol.

To calculate the molar mass of potassium permanganate, we multiply the number of each element by its atomic mass and then sum them up:

Molar mass of \(KMnO_4\)= (1 × 39.10 g/mol) + (1 ×  54.94 g/mol) + (4 ×  16.00 g/mol) = 39.10 g/mol + 54.94 g/mol + 64.00 g/mol = 158.03 g/mol.

Therefore, the molar mass of potassium permanganate is approximately 158.03 g/mol.

In terms of its color, potassium permanganate is a dark purple compound. This vibrant color is characteristic of its extended delocalized system of electrons, which absorbs light in the visible spectrum and reflects the purple wavelength. The intense purple color makes potassium permanganate easily recognizable in its solid or dissolved form.

To learn more about molar mass refer:

https://brainly.com/question/837939

#SPJ11

Potassium permanganate is a compound with the formula \(KMnO4.\)  Its molar mass is approximately 158.03 g/mol. It is a dark purple crystalline solid used as an oxidizing agent and antiseptic.

Potassium permanganate is a compound with the formula

\(KMnO4.\) Its molar mass is calculated by adding up the atomic masses of its constituent elements: potassium (K), manganese (Mn), and oxygen (O). The molar mass of potassium permanganate is approximately 158.03 g/mol.

Potassium permanganate is a dark purple crystalline solid. It is commonly used as a powerful oxidizing agent, antiseptic, and disinfectant. In terms of its color, potassium permanganate is a dark purple compound. This vibrant color is characteristic of its extended delocalized system of electrons, which absorbs light in the visible spectrum and reflects the purple wavelength. The color makes potassium permanganate easily recognizable in its solid or dissolved form.

https://brainly.com/question/35880995

#SPJ12

Synthesis reaction

It is a reaction in which 2 or more reactants combine with each other to form one product .

Check option C

Sulphate and water are combining to form sulfuric acid .

Hence option C is correct

Answer:

SO3 + H2O => H2SO4

Explanation:

I took the test :)

Answer:

The periodic table, in full periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number—i.e., the total number of protons in the atomic nucleus. When the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same column (group) have similar properties. The initial discovery, which was made by Dmitry I. Mendeleyev in the mid-19th century, has been of inestimable value in the development of chemistry.

It was not actually recognized until the second decade of the 20th century that the order of elements in the periodic system is that of their atomic numbers, the integers of which are equal to the positive electrical charges of the atomic nuclei expressed in electronic units. In subsequent years great progress was made in explaining the periodic law in terms of the electronic structure of atoms and molecules. This clarification has increased the value of the law, which is used as much today as it was at the beginning of the 20th century, when it expressed the only known relationship among the elements.

Explanation:

is a table of the chemical elements arraged in order of atomic number

Volume of H₂O produced = (1.8 g) × (1 cm³/g) = 1.8 cm³

Simplifying :

Molar volume of O₂ at STP = 22400 cm³/mol

No. of moles of O₂ liberated = (1120 cm³) / (22400 cm³/mol) = 0.05 mol

According to the given equation, mole ratio H₂O : O₂ = 2 : 1

No. of moles of H₂O produced = (0.05 mol) × 2 = 0.1 mol

Molar mass of H₂O = (1×2 + 16) g/mol = 18 g/mol

Mass of H₂O produced = (0.1 mol) × (18 g/mol) = 1.8 g

Volume of H₂O produced = (1.8 g) × (1 cm³/g) = 1.8 cm³

What happens in the decomposition of hydrogen peroxide?

The decomposition of hydrogen peroxide can be summarized by the chemical equation: which states that two molecules of hydrogen peroxide break down to form two molecules of water and one molecule of oxygen gas, along with heat energy.

Why does hydrogen peroxide decompose quickly?

In many living organisms hydrogen peroxide is a product of metabolism that must be broken down, since in appreciable concentrations it is toxic. The rate of decomposition is increased by the intra-cellular enzyme catalase.

At what temperature does hydrogen peroxide decompose?

Properties. The boiling point of H 2O 2 has been extrapolated as being 150.2 °C (302.4 °F), approximately 50 °C (90 °F) higher than water. In practice, hydrogen peroxide will undergo potentially explosive thermal decomposition if heated to this temperature

Learn more about decomposition of hydrogen peroxide:

brainly.com/question/20418092

#SPJ4

The chemical equations given would be balanced below

The balanced equation of the various given chemical equations can be determined only when the number of atoms on the product part is the same with the number of atoms on the reactant side.

For 1.)

\(N_{2} + 3H_{2} ----- > 2NH_{3}\)

For 2.)

\(2KCl_{3} ----- > 2KCl + 3O_{2}\)

For 3.)

\(2NaCl + F_{2} ----- > 2NaF + Cl_{2}\)

For 4.)

\(2H_{2} + O_{2} ----- > 2H_{2} O\)

For 5.)

\(Pb(OH)_{2} + 2HCl ----- > 2H_{2} O +PbCl_{2}\)

For 6.)

\(2AlBr_{3} + 3K_{2}SO{4} ---- > 6KBr + Al_{2}(SO_{4})_{3}\)

For 7.)

\(CH_{4} + O_{2} ----- > CO_{2} + 2H_{2} O\)

For 8.)

\(C_{3} H_{8} + 3O_{2} ----- > 3CO_{2} + 4H_{2} O\)

For 9.)

\(C_{8} H_{18} + 8O_{2} ----- > 8CO_{2} + 9H_{2} O\)

Learn more about chemical equation here:

https://brainly.com/question/30265799

#SPJ1

Explanation:

its its originality as an atom has to be pure

A different element is formed because the radioactive element has lost its originality as a pure atom when a radioactive element emits alpha radiation.

Some elements of unstable atomic nuclei undergo radioactive decay to form stable nuclei because of the presence of excess nuclear charge inside them are known as radioactive elements.

The stability of nuclei of an element can be estimated by neutron to proton ratio. The atomic number up to Z= 20 is stable nuclei and contains an equal number of protons and neutrons. As the atomic number starts to increase, the repulsion forces between protons increase.

Thus, the neutron-to-proton ratios of stable nuclei increase with increasing atomic numbers. If elements with the atomic number, Z > 83 and n/p > 1.5 and they will be most unstable and radioactive.

For example, Pu-240 emits an alpha particle and gets converted into U-236 which is completely different from the original nuclei.

²⁴⁰Pu₉₄  →   ⁴He₂  +   ²³⁶U₉₂

Therefore, the radioactive element lost its identity after disintegration.

Learn more about the radioactive element, here:

https://brainly.com/question/23759636

#SPJ2

Answer: Carbon's valence shell is unique because it has 4 valence shell electrons, which means it is less likely to gain or lose electrons to other elements. Rather, it shares its electrons. In other words, it tends to form covalent bonds (4) rather than ionizing. This results in carbon being able to form long chains or rings.

Answer:

An example of a chemical change is when copper mixes with the air to form a greenish copper carbonate. A chemical change is a type of change that involves a chemical reaction, in which the substances involved in the change are transformed into new substances with different chemical properties. In this case, when copper mixes with the air, it reacts with carbon dioxide and moisture to form a new substance called copper carbonate. This substance has a different color and chemical properties than the original copper, which indicates that a chemical change has occurred. In contrast, the other options you provided do not involve chemical reactions and are not examples of chemical changes.

Explanation:

The covalent compounds formed from the given elements are as follows:

Covalent compounds are compounds that are formed as a result of covalent bonds formed between atoms of different elements.

Covalent bonds are formed as a result of sharing of electrons between atoms of different elements usually non-metals.

Due to differences between the electronegativities of atoms of nom-metals, the electrons shared in covalent compounds are not always shared equally. Thus, several other intermolecular forces exist between molecules of covalent compounds.

Some of the intermolecular forces that exist in covalent compounds include:

Given the following elements: nitrogen, fluorine, oxygen, carbon, and hydrogen.

The covalent compounds that can be formed representing the given intermolecular forces are as follows:

Learn more about covalent compounds at: https://brainly.com/question/3447218

#SPJ1

The probability that a randomly selected x-value from the distribution is at least 80 is approximately 0.9938.

In a normal distribution with a mean of 98 and a standard deviation of 6, we can calculate the probability of a randomly selected x-value being at least 80.

To do this, we need to find the area under the normal curve to the right of 80. By standardizing the value using the z-score formula, we can convert 80 to a z-score of (80 - 98) / 6 = -3.

The area to the right of this z-score can be obtained from a standard normal distribution table or using statistical software, which is approximately 0.9938.

A normal distribution is a common probability distribution that has a symmetric bell-shaped curve. It is characterized by its mean and standard deviation.

In this case, the mean is 98, indicating the center of the distribution, and the standard deviation is 6, representing the spread of the data around the mean.

The probability calculation involved converting the x-value of interest (80) to a z-score, which measures the number of standard deviations an x-value is from the mean.

By finding the area under the curve to the right of the z-score, we determine the probability of selecting an x-value that is at least 80.

Learn more about distribution

brainly.com/question/29664127

#SPJ11

MgF2 is the empirical formula of the ionic compound that forms from magnesium and fluorine.

The simplest whole number ratio of atoms in a compound is the empirical formula of a chemical compound in chemistry. [1] Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula, S2O2, are two straightforward examples of this idea. As a result, both the sulfur and oxygen compounds sulfur monoxide and disulfur dioxide have the same empirical formula. They do not, however, have the same molecular formulae, which specify how many atoms are present in each molecule of a chemical compound.

To know more about empirical formula, click here,

brainly.com/question/1603500

#SPJ4