Question 9 of 10
Which of the following is an example of a Brønsted-Lowry acid?
OA. NH4+
OB. F
OC. BF3
OD. NH3
SUBMIT

0.86 moles of [tex]N_2[/tex] and 1.72 moles of Li will react.

We must place a 3 coefficient in front of Li in order to bring the equation into balance:

[tex]N_2 + 2Li = 2Li_3N[/tex]

The balanced equation demonstrates that 2 moles of Li and 1 mole of N2 react to create 2 moles of Li3N. Therefore, we can apply the following dimensional analysis to determine how many moles of Li will react with 0.86 moles of N2:

[tex]0.86 mol N_2 x (2 mol Li / 1 mol N_2) = 1.72 mol Li[/tex]

A declaration that two expressions with variables or integers are equal. In essence, equations are questions and attempts to systematically identify the solutions to these questions have been the driving forces behind the creation of mathematics.

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There are 1 lone pairs of electrons are in the ion OH⁻

Since oxygen creates two bonds, we know that two electrons are required to create those two bonds. There are now just two electron pairs remaining that are not involved in bonding. Oxygen thus contains two lone pairs.

The O and H atoms are connected by a solitary covalent link. The oxygen atom has a net -1 charge, which normally manifests as the whole charge on the OH- ion. On the O atom in the OH- Lewis structure, there exist lone electron pairs.

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The moles of carbon, hydrogen, and oxygen may not be whole numbers, we may need to round them to the nearest whole number to get the simplest ratio.

What is Empirical Formula?

The empirical formula of a chemical compound represents the simplest, most reduced ratio of atoms in that compound. It shows the relative number of atoms of each element present in the compound, expressed as the smallest whole numbers. In other words, it gives the simplest whole number ratio of the elements in a compound.

Mass of carbon = moles of CO

Mass of hydrogen = 2 x moles of H2O (since each H2O molecule has 2 hydrogen atoms)

Calculate the moles of oxygen in the compound.

Given:

Mass of oxygen = moles of CO (since each CO molecule has 1 oxygen atom) + moles of H2O (since each H2O molecule has 1 oxygen atom)

Determine the empirical formula.

The empirical formula represents the simplest, most reduced ratio of atoms in the compound. To determine it, we can use the mole ratios of carbon, hydrogen, and oxygen calculated in the previous steps.

Empirical formula = CxHyOz, where x, y, and z represent the mole ratios of carbon, hydrogen, and oxygen, respectively.

Now, let's plug in the calculated values for moles of carbon, hydrogen, and oxygen into the empirical formula:

Empirical formula = C moles : H moles : O moles

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The empirical formula of the unknown compound given the combustion analysis data is C2H3O.

The first step in solving this problem is to know how much carbon and hydrogen in grams are in the carbon dioxide (CO2) and water (H2O) produced. From the mass of CO2, we get 2.224g * 0.2729 (proportion of carbon in CO2) = 0.607g C. And the mass of hydrogen is 0.3035 g * 0.1119 (proportion of hydrogen in H2O) = 0.034g H. The remaining mass is 1g (total mass) - 0.607g C - 0.034g H = 0.359g O. Then, we need to convert these values to moles. This gives us 0.607g C * (1 mole C / 12.01 g C) = 0.050 moles C, 0.034g H * (1 mole H / 1.01 g H) = 0.033 moles H, and 0.359g O * (1 mole O / 16.00 g O) = 0.022 moles O.

By finding the ratio of these moles, we get C2H3O, which is the empirical formula of the compound.

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Answer:

the new concentration of the solution is 0.171 M.

Explanation:

To solve this problem, we can use the formula for dilution:

C1V1 = C2V2

where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Substituting the given values, we get:

(0.400 M)(300.0 mL) = C2(700.0 mL)

Solving for C2, we get:

C2 = (0.400 M)(300.0 mL) / (700.0 mL)

C2 = 0.171 M

Therefore, the new concentration of the solution is 0.171 M.

Alkene is transformed to alcohol via the oxymercuration-demercuration reaction. The reagent employed in this reaction is mercury (II) acetate in tetrahydrofuran, which also serves as the solvent.

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B. It will be slow because you will have to wait for natural processes to affect each area.

What is Ocean?

An ocean is a vast body of saltwater that covers more than 70% of the Earth's surface. Oceans are the largest bodies of water on our planet and are essential for supporting life on Earth. Oceans play a crucial role in regulating the Earth's climate, absorbing heat and carbon dioxide, and generating oxygen.

The impact of human activities on ocean shores zones, such as coastal development, pollution, and overfishing, can have long-lasting and sometimes irreversible effects on these ecosystems. Restoring or mitigating the impacts of human activities on ocean shores zones requires time and effort, as natural processes need to take place to restore the affected areas.

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Li₃PO₄ + 3 Zn(NO₃)₂ → 3 LiNO₃ + Zn₃(PO₄)₂. In this balanced equation, one of the products is Zn₃(PO₄)₂. To ensure that the equation is balanced, we need 3 moles of Zn(NO₃)₂ for every 1 mole of Li₃PO₄.

In a chemical reaction, a product is a substance that is formed as a result of the chemical reaction. It is the end result of a chemical reaction, and it is produced by the rearrangement of atoms and/or ions of the reactants.

In the given equation, we end up with 1 mole of Zn₃(PO₄)₂ for every 3 moles of Zn₃(PO₄)₂. This means that the molar ratio of Zn₃(PO₄)₂ to Zn₃(PO₄)₂ is 1:3, indicating that we need three times as much Zn₃(PO₄)₂ as Zn₃(PO₄)₂ to balance the equation. Therefore, one of the products, Zn₃(PO₄)₂, must be produced in a smaller quantity than the other product, LiNO₃.

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Answer:

H₂S(aq) + H₂O(l) → HS⁻(aq) + H₃O⁺(aq)

The Bronsted-Lowry Theory defines acids as substances that act as proton donors (proton refers to the H⁺ ion which only consists of a single proton, no electron). Bases are therefore substances that act as proton acceptors. This theory can apply to practically any solvent.

For example, neutralisation of hydrochloric acid with sodium hydroxide:

HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)

In the reaction provided, hydrogen sulfide reacts with water.

H₂S(aq) + H₂O(l) → HS⁻(aq) + H₃O⁺(aq)

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The mass (in grams) of CuO formed when 63.5 g of copper, Cu is heated strongly in air is 79.5 g

First, we shall write the balanced equation for the reaction, This is given below:

2Cu + O₂ -> 2CuO

Now, we shall determine the mass of CuO formed from the reaction. Details below:

From the balanced equation above,

127.1 g of Cu reacted to form 159.1 g of CuO

Therefore,

63.5 g of Cu will react to form = (63.5 × 159.1) / 127.1 = 79.5 g of CuO

Thus, the mass of CuO formed is 79.5 g

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There are 91.84L of a 0.200 M sodium cyanide solution would be needed to react with 45.0kg of rocks that contain 2.00% by mass of gold

The formula for % w/w is mass of solute /mass of solution*100

Substituting the values in the equation

2%= mass of solute/45000 *100

mass of solute= 2*45000/100

mass of solute = 900 gram

Now, to calculate the volume we use the molarity given

molecular weight of sodium cyanide is 49 g/mol

Molarity= mass of solute/molecular mass *volume

0.2=900/49* volume

volume= 900/49*0.2

volume= 91.84 liter

The mass percentage of a solute in solution is the percent concentration of a substance (solute) in solution when it is stated as 'w/w'. This phrase is frequently used when the solute and solution are weighted.

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The car's average speed is 116 kilometers per hour.

The entire distance traveled divided by the total time elapsed is the definition of average speed. It is typically stated in terms of the amount of time or distance per unit, such as meters per second (m/s) or kilometers per hour (km/hr).

Average speed = total distance ÷ total time

In this case, the total distance is 464 km and the total time is 4 hours.

Average speed = 464 km ÷ 4 hours

Average speed = 116 km/hr

Therefore, the car's average speed is 116 kilometers per hour.

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Answer:A. The gas particles have essentially zero volume and no attraction

for one another.

Explanation:

To determine the number of moles of boron in 6.035 x 10^25 atoms of boron, we need to use Avogadro's number, which is 6.022 x 10^23 particles per mole. We can set up a proportion to solve for the number of moles:

(6.035 x 10^25 atoms) / (6.022 x 10^23 atoms/mol) = x moles

Simplifying the expression on the left side, we get:

x = (6.035 / 6.022) x (10^25 / 10^23) moles

x = 1.002 moles

Therefore, there are 1.002 moles of boron in 6.035 x 10^25 atoms of boron.

The color of the paper may change as a result of the UV light.

Yes, that is conceivable if the table you are referring to shows that ultraviolet (UV) radiation can cause the paper to change colour.

Compared to visible light, UV light is more energetic and has shorter wavelengths. The molecules of the paper may experience a chemical reaction as a result of this high-energy radiation, changing the colour of the paper.

The term "photochemical reaction" or "photochemistry" refers to this process. The molecules of the paper are affected by UV radiation, which can result in chemical reactions that create new compounds with various colours.

For instance, some dyes have chemical connections that are UV-sensitive. These connections may rupture in the presence of UV radiation, changing the dye's colour.

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Explanation: The level of the liquid in a sealed jar decreases slightly due to the evaporation of some of the liquid molecules into the air space above the liquid. However, once the concentration of the liquid molecules in the air space reaches a certain level, the rate of evaporation will slow down. This is because the concentration of the liquid molecules in the air space will eventually reach a point where the rate of evaporation is balanced by the rate of condensation.

At this point, the liquid molecules in the air space will be colliding with the surface of the liquid at the same rate that liquid molecules are evaporating from the surface of the liquid. As a result, the level of the liquid will cease to change, and the liquid will remain at a stable level within the jar.

We can start by using Dalton's Law of Partial Pressures, which states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas component.

Let PCO2 be the partial pressure of CO2 in the mixture after it is added. Then, we can set up the following equation:

PO2 + PN2 + PAr + PCO2 = Ptotal

Substituting in the given partial pressures and total pressure, we get:

100 torr + 150 torr + 200 torr + PCO2 = 575 torr

Simplifying the equation, we get:

PCO2 = 575 torr - 100 torr - 150 torr - 200 torr

PCO2 = 125 torr

Therefore, the partial pressure of CO2 in the gas mixture is 125 torr. Answer: B) 125 torr.

Answer: 199.68 grams of oxygen gas (O2) are needed to react with 85 grams of ammonia (NH3).

Explanation: The equilibrium chemical equation is as follows:

The chemical equation expressed as 4NH3 + 5O2 → 4NO + 6H2O is a representation of a chemical reaction that describes the reaction between four molecules of ammonia and five molecules of oxygen to yield four molecules of nitrogen monoxide and six molecules of water.

The stoichiometric analysis indicates that the reaction between oxygen and ammonia necessitates five moles of the former to react with four moles of the latter.

The present ratio can be employed for the computation of the requisite quantity of O2 necessary for the reaction with 85 grams of NH3, in the ensuing manner:

Determine the quantity of moles of NH3.

The molar mass of ammonia (NH3) can be calculated by adding the atomic masses of its constituent elements. The atomic mass of nitrogen (N) is 14.01 g/mol, and the atomic mass of hydrogen (H) is 1.01 g/mol. Therefore, the molar mass of NH3 is determined by adding the atomic mass of N to three times the atomic mass of H. Mathematically, the molar mass of NH3 is expressed as 14.01 g/mol + 3(1.01 g/mol), which yields a value of 17.04 g/mol.

The quantity of NH3 in moles can be determined by dividing the mass of NH3 by its corresponding molar mass, according to the fundamental principle of stoichiometry.

The number of moles of NH3 can be determined as 85 grams divided by the molar mass of NH3, which is 17.04 grams per mole.

The calculated value of the quantity represented by "moles of NH3" has been determined to be 4.99 mol, with insignificance beyond two decimal places due to rounding.

Determine the quantity of moles of O2 necessary.

The number of moles of O2 present is equivalent to five-fourths of the moles of NH3.

The amount of oxygen, represented by the unit of moles, can be mathematically expressed as (5/4) multiplied by 4.99 mol.

The quantity of oxygen, expressed in terms of moles, corresponds to 6.24 mol.

The conversion of moles of O2 to grams can be made by utilizing the molar mass of O2, which is 32 g/mol. This entails multiplying the given number of moles by the molar mass in order to obtain the corresponding mass in grams.

The molar mass of O2 was determined to be 32.00 g/mol, which was derived by multiplying 2 with the molar mass of oxygen, 16.00 g/mol.

The computation of the mass of O2 is achieved by multiplying the number of moles of O2 by the molar mass of O2.

The expression denoting the quantity of molecular oxygen, where mass is represented as a product of 6.24 moles and a molecular weight of 32.00 grams per mole, can be expressed in a manner consistent with academic writing.

The mass of O2 is 199.68 g.

In this reaction, 8.55 grammes and 11.34 grammes of KCN will react.KCN's molar mass, 65.12 g/mol, is equal to its molecular mass, or mass of KCN, which is equal to 0.1744 mol.

Something that occurs in response to another event is called a reaction. A reaction is an procedure where any number of compounds are changed into other substances in science. This occurs when chemical bonds are broken & new ones are formed.

They responded favourably to the news. He expressed disbelief when I first informed him what had transpired. Most attendees at the conference reacted to the announcement with anger or shock. When I initially met him, I didn't believe he was trustworthy.

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An antacid tablet's CaCO content should be between 25 and 35% by mass.

To completely neutralise 20 ml of HCl solution, 19.85 ml of 0.01 M NaOH solution is required.

It is a neutralisation reaction in which sodium hydroxide, a basic, interacts with  to form salt sodium phosphate, which is salt and water. According to the stoichiometric mole ratio, three moles of sodium hydroxide are needed to neutralise one mole of phosphoric acid.

To calculate the amount of moles of acid neutralised by the tablet, subtract the number of moles of acid neutralised in the titration from the starting solution's moles of acid.

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The compound shown has the IUPAC name O Macmillan Learning. -3-ethyl-2,2-dimethyl-hexane Incorrect.

Explanation and response: Because it implies that there's methyl groups on carbons number one and sixth of the parent carbon chain, the name — appears-dimethylhexane is incorrect. Because the name "hexane" implies that a parent atom chain only has six molecules long, the methyl groups are located at the ends of every molecule.

Hexane, commonly referred to as sextane, is an organic compound that belongs to the alkane class. They are acyclic branched as well unbranched hydrocarbons with the standard structure CnH2n+2, and thus entirely composed of hydrogen and saturated oxygen atoms. Hexane is a colorless, clear liquid.

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Answer:

Explanation:

0.25 moles KCl = 19g KCl (molar mass KCl = 74.6g)

The  volume of acetone would be required to purify a 5.0g sample of compound is 58.82ml

Let use the solubility data of acetone provided to calculate the volume.

First we will need to calculate the solubility of Y in 25 degree.

   Solubility of Y= 0.12g/10ml= 0.012g/ml.

Solubility of y in boiling acetone = 0.85g/10ml =0.085g/ml.

In order to purify y, we need to dissolve the amount of y in the 5.0g sample.

The amount of acetone needed to dissolve y in the sample is

amount acetone= mass of y/ solubility of y in boiling acetone.

amount acetone= 5.0g/0.085g/ml= 58.82ml.

Therefore, the  volume of acetone would be required to purify a 5.0g sample of compound is 58.82ml

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Answer: 34.24 g

Explanation: The molar mass of CO(NH2) can be calculated by including up the nuclear masses of each component within the atom. The nuclear masses of carbon (C), oxygen (O), nitrogen (N), and hydrogen (H) are 12.01 g/mol, 16.00 g/mol, 14.01 g/mol, and 1.01 g/mol, individually.

Molar mass of CO(NH2) = 1 x molar mass of C + 1 x molar mass of O + 2 x molar mass of N + 4 x molar mass of H

Molar mass of CO(NH2) = 1 x 12.01 g/mol + 1 x 16.00 g/mol + 2 x 14.01 g/mol + 4 x 1.01 g/mol

Molar mass of CO(NH2) = 60.06 g/mol

Presently, we will utilize this molar mass to change over moles of CO(NH2) to grams of CO(NH2):

mass of CO(NH2) = number of moles x molar mass

mass of CO(NH2) = 0.57 mol x 60.06 g/mol

mass of CO(NH2) = 34.24 g

Hence, there are 34.24 grams of CO(NH2) in 0.57 moles of CO(NH2). The answer isn't among the choices, so we have to be calculate the proper reply.

To discover the proper reply, ready to utilize the relationship between moles and mass:

mass = moles x molar mass

mass = 0.57 moles x 60.06 g/mol = 34.24 g

Answer:

The composition and properties of a substance are different from each other.

The composition of a substance is what he substance is made of.

Let's take water as an example. We know that the chemical formula for water is  . This tells us that water has 2 hydrogen molecules and 1 oxygen molecule. That is the composition of water.

The properties of a substance are how a substance appears and behaves both chemically and physically.

Again, let's use water as an example. Most times, water is a clear liquid. It freezes at 0 degrees Celsius and boils at 100 degrees Celsius. These are some of water's physical properties. Water also has many chemical properties; however, we needn't go into those.

Explanation:

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Answer:

a. The recorded waves are mechanical waves.

c. The wave display does not change the wave type.

e. The frequency or amplitude of the waves could change.

These statements are true. Recorded sound waves are mechanical waves, meaning they require a medium to travel through, such as air or water. The wave display is a device that displays the shape, frequency, and amplitude of the sound waves. It does not change the type of wave from mechanical to electromagnetic, or vice versa. The frequency and amplitude of the sound waves could change, depending on the characteristics of the source producing the sound.

There are 6 atoms of oxygen present on the reactants side of the given reaction. Thus the correct answer is option B.

Firstly, let us write the accurate chemical equation and then subsequently we will balance it as and when needed.

4Fe+3O₂→2Fe₂O₃

This is the correct balanced chemical equation for the reaction. And as we can find that the amount of iron and oxygen atoms on the reactants side is equivalent to that of the products side. This corroborates that the given chemical equation is correctly balanced.

Now, the query is based on counting the total number of oxygen atoms present on the side of reactants. As we can clearly see on the reactant side  there are three Oxygen molecules that are present. That means that there are a total of six oxygen atoms, since 3*2 gives us a total of 6 oxygen atoms.

Hence, there are a sum total of six O₂ atoms that are present on the reactant side of the provided chemical equation.

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The full question is:

How many oxygen atoms are present on the reactant side of the chemical equation  4Fe+3O₂→2Fe₂O₃?

A. 3

B. 6

C. 7

D. 13

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The amount of heat required to melt 13.3 g of ice at 0°C in water at 0°C is approximately 4.43 kJ.

What is Heat?

Heat is a form of energy that is transferred between objects or systems as a result of a temperature difference. It is a form of energy associated with the motion of particles, such as atoms and molecules, within a substance. Heat energy is responsible for changing the temperature of a substance or causing phase transitions, such as melting, boiling, or condensing.

Given:

Mass of ice (m) = 13.3 g

ΔHfus for water = 6.01 kJ/mol

First, we need to convert the mass of ice from grams to moles, using the molar mass of water. The molar mass of water (H2O) is:

2(atomic mass of hydrogen) + atomic mass of oxygen

= 2(1.008 g/mol) + 15.999 g/mol

= 18.015 g/mol

So, moles of ice (n) = mass of ice (m) / molar mass of water

= 13.3 g / 18.015 g/mol

= 0.7386 mol

Now, we can use the formula to calculate the heat required:

Q = m * ΔHfus

= 0.7386 mol * 6.01 kJ/mol

= 4.43 kJ (rounded to two decimal places)

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