How many moles of C2H3N022- would you need to prepare a buffer solution with C2H4NO2 that has a pH = 9.85? O 1.17 O 0.85 0.068 O 0.07

Answer:

30 2 the second power

Explanation:

Calcium hydroxide, commonly known as hydrated lime or slaked lime, is a soft white powder that is used as a primary ingredient in the chemical industry.

Its chemical formula is Ca(OH)2. When calcium oxide and water are combined, it produces.

There are two hydroxide ions (OH) in the molecule for every calcium ion (Ca2+). The substance is ionic, and both electrolytic and aqueous dissociations result in calcium and hydroxide ions.

When water is added to dry portland cement to create concrete, this reaction takes place, and the mixture warms up and releases heat. An alternative method of manufacturing entails an aqueous double displacement reaction between sodium hydroxide and calcium chloride.

Therefore, Calcium hydroxide, commonly known as hydrated lime or slaked lime, is a soft white powder that is used as a primary ingredient in the chemical industry.

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The subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).

The properties of an element are primarily determined by its atomic structure. Elements are characterized by the number of protons, neutrons, and electrons they possess.

Protons and neutrons are located in the nucleus of an atom, while electrons orbit around the nucleus in energy levels or shells.

The electron configuration of an atom, specifically the arrangement and distribution of electrons in the outermost shell, is what primarily influences the chemical and physical properties of an element. The behavior of atoms in chemical reactions, bonding patterns, and electrical conductivity are all related to the movement and interactions of electrons.

Although protons and neutrons contribute to factors such as atomic mass and stability, the electron's involvement in chemical reactions and interactions is most significant in determining an element's properties.

Therefore, the subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).

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The temperature of water after 30 minutes will decrease. The correct option to this question is B.

The thermometer may blow up if the temperature exceeds the permitted limit. Since boiling water is known to have a temperature in the range of 100 C, a standard clinical thermometer cannot be used to measure its temperature. Query: Laboratory Boiling water's temperature can be determined using thermometers.

A thermometer's operation is an illustration of how a liquid can be heated and cooled. The molecules of the liquid in the thermometer move more quickly when it is heated, which causes them to move somewhat farther apart. The thermometer moves upward as a result.

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When dissolving PVA (polyvinyl alcohol) in water, it is important to not exceed a temperature of 80°C for a few reasons. First and foremost, PVA is a thermoplastic, which means that it can soften and even melt under high temperatures. This can result in the PVA becoming too sticky and difficult to handle, and in some cases, it can even cause the PVA to break down chemically, reducing its effectiveness as a binder or adhesive.

Additionally, the solubility of PVA in water is highly temperature-dependent. At temperatures above 80°C, the PVA molecules begin to break down and become less soluble in water. This means that the PVA may not dissolve fully, resulting in clumps or uneven distribution in the water, which can cause issues with the final product.

Therefore, to ensure that the PVA dissolves properly and maintains its chemical and physical properties, it is best to keep the temperature below 80°C when dissolving it in water. This allows for a long answer, but it is important to understand the science behind this process to ensure the best results when using PVA as a binder or adhesive.

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Answer: C: an electron

Explanation:

Answer:

C: electrons

Explanation:

Substances produced when atoms of elements chemically combine with each other are called Compound.

Compounds are defined as the pure substances formed from two or more elements by the chemical combination.

For example:

A element is defined as a species or group of atoms which have a given number of protons in their nuclei, including the pure substance made up of only that species. Unlike chemical compounds, chemical elements can not be broken down into more simpler substances by applying any chemical reaction.

An element is composed of a single type of atom. An atom is defined as the smallest indivisible unit of matter. It composed of electrons, protons and neutrons. The centre of an atom is termed as the nucleus which is positively charged and having protons and neutrons.

Thus, we concluded that the substances produced when atoms of element chemically combine with each other are called compound.

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the nurse will administer approximately 1 teaspoon (tsp) of the medication.1 teaspoon (tsp) is approximately equal to 5 mL.

To determine the number of teaspoons the nurse should administer, we need to calculate the equivalent volume of 30 mEq of KCL using the provided concentration of 60 mEq/10 mL.

First, we'll find the ratio of milliequivalents (mEq) to milliliters (mL) in the given concentration:

60 mEq / 10 mL = 6 mEq/mL

Next, we can set up a proportion to find the volume (in mL) that corresponds to 30 mEq:

6 mEq/mL = 30 mEq / X mL

To solve for X, we can cross-multiply:

6X = 30 * 1

6X = 30

X = 30 / 6

X = 5 mL

Since the medication cup is marked in teaspoons, we need to convert 5 mL to teaspoons.

1 teaspoon (tsp) is approximately equal to 5 mL.

Therefore, the nurse will administer approximately 1 teaspoon (tsp) of the medication.

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Answer:

1) 9.4 mol

2) 0.6 mol

3) 0.9 mol

What is Stoichiometry?

In chemical equations, unless stated otherwise, the reactants and products will theoretically always remain in stoichiometric ratios.

The stoichiometry of a reaction is the relationship between the relative quantities of products and reactants, typically a ratio of whole integers.

Consider the following chemical reaction: aA + bB ⇒ cC + dD.

The stoichiometry of reactants to products in this reaction is the ratio of the coefficients of each species: a : b : c : d.

Converting between moles and mass:

To convert from mass to moles, divide the mass present by the molar mass, resulting in the number of moles. Mathematically, the units present themselves like this: \(\frac{g}{gmol^{-1}} =g(g^{-1}mol)=mol\).

Thence, the formula for moles: n = m/M, where n = number of moles, m = mass present, and M = molar mass. This formula can be easily rearranged to find mass present from molar mass and moles, or molar mass from mass and moles.

1) For the reaction C + 2H₂ → CH₄, how many moles of carbon are needed to make 150.6 g of methane, CH₄? (Molar Masses: H=1; C=12)

Stoichiometry of carbon to methane = 1 : 1.

Therefore, moles of CH₄ = moles of C. Using the formula to find moles, n(CH₄) = m/M = 150.6/(12+1×4) =9.4125 ≈ 9.4 mol

Therefore, we require 9.4 moles of carbon.

2) S + 6HNO₃ → H₂SO₄ + 6NO₂ + 2H₂O

In the above equation, how many moles of water can be made when 113 g of HNO₃ are consumed? (Molar Masses: H=1; N=14; S=32; O=16)

Stoichiometry of Nitric acid to water = 6 : 2 = 3 : 1. Therefore, we produce 1 mole of water for every 3 moles of nitric acid consumed. Hence,  n(HNO₃) = m/M = 113/(1+14+16×3) = 1.79365 mol

Therefore: n(H₂O) = 1/3 × n(HNO₃) = 0.59788 mol ≈ 0.6 mol

3) 3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 2NO + 4H₂O

In the above equation, how many moles of water can be made when 117.8 grams of HNO3 are consumed?

Stoichiometry of Nitric acid to water = 8 : 4 = 2 : 1. Therefore, we produce 1 mole of water for every 2 moles of nitric acid consumed. Hence,  n(HNO₃) = m/M = 117.8/(1+14+16×3) = 1.86984 mol

Therefore: n(H₂O) = 1/2 × n(HNO₃) = 0.9349 mol ≈ 0.9 mol

The ratio of the resistance of wires Y and X is 2:1

Resistance in an electrical circuit is used to calculate the current flow. The symbol for the ohm, a unit of measurement for resistance, is omega. The unit of resistance is named after German physicist Georg Simon Ohm, who looked into the relationship between voltage, current, and resistance. He is credited for creating Ohm's Law.

To ascertain the state of a component or circuit, resistance measurements are frequently made.

Since resistance is independent of length, it stays constant. The term resistivity itself refers to the material's resistance per unit length and unit area.

While the resistance depends on the length

R₁=ρL/A

R₂=ρ2L/A

R₂=2ρL/A

R₂=2R₁

Thus, the resistance of a second wire is twice that of a first wire.

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Explanation:

pH is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution.

Periodic table is divided into three metals, non metals and metalloids. The non metals are kept on the right side of the periodic table. Th correct option is option D.

Non metals are the element that have property to gain electron. When any element gain electron then element attain negative charge and that element is called anion. The examples of non metals are Oxygen, nitrogen, carbon, Fluorine etc.

The properties of non metals are

Non metals are soft.

Non metals are not malleable that is they can be broken into thin sheets.

Non metals are not ductile they can not be broken into thin wires.

Non metals are brittle in nature that is they can be broken down easily.

Non metals are not lustrous.

In metals, reactivity increases down a group, and in non-metals reactivity increases up a group.

Therefore the correct option is option D.

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Answer:

d

Explanation:

same question

Answer:

Prokaryotic / Eukaryotic

Answer:

It's more like abnormal tissue growth

Explanation:

consider it like a cancer.

Answer:

0.807 moles

Explanation:

No of molecules = No of mole × Avogadro's number

No of mole = No of molecules / Avogadro's number

No of mole = 5.24×10^23/6.02×10^23

0.870 moles

Answer: If we work it out with direct proportions, the vapor pressure of propanone is 56 degrees Celsius. The atmospheric pressure is about 101.

Explanation: hope this helps.

The vapor pressure of propanone at 50°C is :

- 78° vapor pressure

When the vapor pressure is specifically work through the extents to a temperature rate it response is intensely subordinate on their possess a mass nature.

The vapor weight of propanone is calculated and shape in degree Celsius in rate.

The rate of vapor when it is calculated by 50°C with propanone its at long last gives us a 78° vapor pressure.

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The molar mass of the compound (i.e silver oxide) Ag₂O obtained from the periodic table is 232 g/mol

The molar mass a compound is simply defined as the sum of the molar masses of the individual elements found in the compound.

Molar mass of Ag₂O = (2×108) + 16

Molar mass of Ag₂O = 216 + 16

Molar mass of Ag₂O = 232 g/mol

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Answer: 231.753 g/mol

Explanation:

got it right on Exact Path

The periodic properties of the d-block elements differ from the main group elements in that they are less sensitive and less reactive.

The periodic table is divided into blocks; s-block, p-block, f-block, and d-block. The d-block elements are also known as transition metals.

The s and p-block elements are known as the main group elements. Compared to these, the d-block elements have some different properties because of their partially filled d-orbitals.

However, the d-block elements still have many similar properties. These elements can still displace hydrogen from dilute acid and some of them can react with water under appropriate conditions.

The first row of these transition metals are found to be more reactive than the second and third row. However, they are not as reactive as the s-block and p-block elements.

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Therefore, 50 mL of distilled water must be added to 0.5 mL of 0.1 M FeCl₃ to make it 0.001 M FeCl₃.

Distilled water is a type of purified water that has gone through a process of distillation, which involves boiling water and then condensing the steam into a separate container. This process removes impurities and minerals from the water, resulting in a very pure form of water. Distilled water is often used in laboratory experiments and medical procedures where purity is important. It can also be used in household appliances, such as irons and humidifiers, to prevent mineral buildup that can lead to damage or decreased performance.

Here,

To calculate the amount of distilled water that must be added to 0.5 mL of 0.1 M FeCl₃ to make it 0.001 M FeCl₃, we can use the dilution formula:

M1 x V1 = M2 x V2

where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

We can rearrange this formula to solve for V2, which represents the volume of water that must be added:

V2 = (M1 x V1) / M2

Plugging in the values we have:

M1 = 0.1 M (the initial concentration)

V1 = 0.5 mL (the initial volume)

M2 = 0.001 M (the final concentration)

V2 = unknown (the volume of water to be added)

V2 = (0.1 M x 0.5 mL) / 0.001 M

V2 = 50 mL

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Through a procedure known as polymerization, monomers are joined to produce polymers.

the process of polymerization involves the joining of monomers, or small organic molecules, to create polymers, which are larger molecules that resemble long chains. Condensation and addition polymerization are the two primary forms of polymerization.

The method of addition polymerization involves joining together monomers with double or triple bonds to create polymers without losing any atoms. Plastics such as polyethylene and polypropylene are produced using this method of polymerization.

In the process of condensation polymerization, functional monomers like amines and carboxylic acids are linked together to form polymers by removing a tiny molecule like water. Polyamides, polyesters, and polyurethanes are produced using this form of polymerization.

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Answer:

the object should be displaced on which the force is applied

Explanation:

HOPE IT HELPS YOU

Answer:

Because the cohesive forces inside the droplets are stronger than the adhesive forces between both the drops and the wax, water does not penetrate waxed surfaces. Because the adhesive forces between the liquid and the glass are stronger than the cohesive forces inside the water, water wets glass and spreads out across it.

Explanation:

EDMENTUM

Answer:

The answer is the layer of the sun that radiates energy outwards from the sun core

Explanation:

the reason why that is becuase the convection zone is a layers which is unstable to convection. And energy is primarily or partially transported by convection

Answer:

D

Explanation:

Answer:

bbbbbbbbbbbbbbbbbbb

Explanation:

A food supply company produces Yellow-42 (from previous example) in 200-gram wholesale bottles. The grams of FeCl3 needed to produce one bottle of Yellow 42 is 303.638 grams.  The amount of NaOH needed to produce one bottle of Yellow 42 is 226.32 grams.

∴

Using the relation for the number of moles which is:

\(\mathbf{number \ of \ moles = \dfrac{mass }{molar \ mass}}\)

\(\mathbf{number \ of \ moles \ of \ Yellow \ 42 = \dfrac{200 g }{106.867 \ g/mol}}\)

\(\mathbf{number \ of \ moles \ of \ Yellow \ 42 =1.872 \ moles}\)

Now,

∴

Mass of FeCl₃ required = number of moles of  FeCl₃ × molar mass of FeCl₃

Mass of FeCl₃ required = 1.872 moles × 162.2 g/mol

Mass of FeCl₃ required = 303.638 grams

7.

Recall that:

Now, 1.872 moles of Fe(OH)₃ will require (3 × 1.872 moles of NaOH)

= 5.616 moles of NaOH

Thus, the amount of NaOH in grams, that will be needed to produce one bottle of Yellow 42 is:

= 5.616 moles × 40.3 g/mol (molar mass of NaOH)

= 226.32 grams of NaOH

8.

The company could set up this reaction in a way that ensures no iron (III) chloride is wasted in the reaction by using the concept of the stoichiometry of the reaction involved in the system and he should feed the reactant within the ratio of 1:3 for FeCl₃ and NaOH respectively.

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Answer:

45594J

Explanation:

Needed information in this question are;

Specific heat of ice = 2.06 J/g°C

Specific heat of water = 4.18 J/g°C

Specific heat of steam = 2.03 J/g°C

Heat of fusion of water ΔHf = 334 J/g

Melting point of water = 0 °C

Heat of vaporization of water ΔHv = 2257 J/g

Boiling point of water = 100 °C

- STEP 1:

Q1 = mcΔT

where

m = 15 grams

c (specific heat of ice) = 2.06 J/g°C

Tinitial = -5 °C

Tfinal = 0 °C

ΔT = (Tfinal – Tinitial)

ΔT = (0 °C - (-5 °C))

ΔT = 5 °C

Q1 = mcΔT

Q1 = (15 g) · (2.06 J/g°C) · (5 °C)

Q1 = 154.5 J

- STEP 2:

Q2 = m · ΔHf

where

m = 15 grams

ΔHf (heat of fusion) = 334 J/g

Q2 = m · ΔHf

Q2 = 15 · 334 J/g

Q2 = 5010 J

- STEP 3:

Q3 = mcΔT

where

m = 200 grams

c (specific heat of water) = 4.18 J/g°C

Tinitial = 0 °C

Tfinal = 100 °C

ΔT = (Tfinal – Tinitial)

ΔT = (100 °C – 0 °C)

ΔT = 100 °C

Q3 = mcΔT

Q3 = (15 g) · (4.18 J/g°C) · (100 °C)

Q3 = 6270 J

- STEP 4:

Q4 = m · ΔHv

where

m = 15 grams

ΔHv (heat of vaporization) = 2257 J/g

Q4 = m · ΔHf

Q4 = 15 · 2257 J/g

Q4 = 33855 J

- STEP 5:

Q5 = mcΔT

where

m = 15 grams

c (specific heat of steam) = 2.03 J/g°C

Tinitial = 100 °C

Tfinal = 110 °C

ΔT = (Tfinal – Tinitial)

ΔT = (110 °C – 100 °C)

ΔT = 10 °C

Q5 = mcΔT

Q5 = (15 g) · (2.03 J/g°C) · (10 °C)

Q5 = 304.5 J

Total heat = 304.5J + 33855 J + 6270 J + 5010 J + 154.5 J

= 45594J

The statement that can be made about the samples is that each balloon contains 1 mole of each gas.

Molar volume refers to the volume that is occupied by one mole of a gas. According to Avogadro, the volume occupied by one ole of  a gas is 22.4-L at STP.

Hence, if 22.4-L at STP is the volume of both the helium and argon filled balloons, then each balloon contains one mole of the gas.

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The mass of potassium chloride produced when potassium chlorate decomposes in this instance is 178.92 g.

The balanced chemical equation is:

2KClO3(s) → 2KCl(s) + 3O2(g)

From the equation, we can see that 2 moles of KClO3 produce 2 moles of KCl. Therefore, 1 mole of KClO3 produces 1 mole of KCl.

Given that 2.4 moles of KClO3 decompose, the amount of KCl produced will also be 2.4 moles.

Now, we need to find the mass of KCl produced, using the molar mass of KCl:

KCl: K = 39.10 g/mol, Cl = 35.45 g/mol

Molar mass of KCl = 39.10 + 35.45 = 74.55 g/mol

Mass of KCl produced = number of moles x molar mass

Mass of KCl produced = 2.4 moles x 74.55 g/mol = 178.92 g

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Answer:249.68 g/mol

Explanation: