Help me please and thank you

Answer:

40.72g of sulfuric acid are needed

Explanation:

When sulfuric acid, H₂SO₄, is neutralized by lead (IV) hydroxide, Pb(OH)₄, Lead (IV) sulfate, Pb(SO₄)₂ and water as follows:

2 H₂SO₄ + Pb(OH)₄ → Pb(SO₄)₂ + 4H₂O

To solve this question we must find the moles of 57.18g of Pb(SO₄)₂. As 2 moles of H₂SO₄ produce 1mol Pb(SO₄)₂ we can find the moles of H₂SO₄ and its mass as follows:

Moles Pb(SO₄)₂ -Molar mass: 275.23 g/mol-

57.18g * (1mol / 275.23g) = 0.2078 moles Pb(SO₄)₂

Moles H₂SO₄:

0.2078 moles Pb(SO₄)₂ * (2mol H₂SO₄ / 1mol Pb(SO₄)₂) = 0.4155 moles H₂SO₄

Mass H₂SO₄ -Molar mass: 98g/mol-

0.4155 moles H₂SO₄ * (98g / mol) =

Answer:

I would assume its the last one "The grass in the prairie provides oxygen, while animals give off carbon dioxide gas."

Explanation:

The question asks how the animals and plants rely on each other

The plants provide oxygen and food for the animals, and the animals provide carbon dioxide to them.

Hope this helps :D

The percentages of KBr and KI  in the sample by mass is 80.68 and 19.32 % respectively.

Molar mass is defined as the mass contained in 1 mole of sample.

It is given that

the sample has a total mass of 5.76 g contains KBr and KI

and contains 1.79 gm of K is present

what is the percentage of KBr and KI in the sample

Molecular weight of K = 39

Molecular weight of Br = 79.9

Molecular weight of I = 126.9

In KBr the mass percentage of K is 39/(39+79.9) = 32.89%

In KI the mass percentage of K is 39/(39+126.9) = 23.5%

Let the mass of KBr present in the sample is x

K will be 0.3289 x

and let the mass of KI present be y

K will be 0.235y

x +y =5.76

0.3289x+0.235y = 1.79

0.0939y = 0.1045

y = 1.1125 gm

x = 5.76-1.1125

x = 4.6475 gm

% of KBr = (4.6475/5.76  )*100 = 80.68 %

% of KI = (1.1125/5.76) *100 = 19.32%

To know more about Molar Mass

https://brainly.com/question/12127540

#SPJ1

Answer:

this reaction is an oxidation reaction

The chemical reactions involving both oxidation and reduction are known as redox reactions. The oxidation involves the loss of electrons. The reaction of lead with oxygen is an example of oxidation reaction.

According to the classical concept, oxidation is defined as a process which involves the addition of oxygen or electronegative element or the removal of hydrogen or electropositive element.

During electron transfer, the species which loses electrons is said to be oxidized and the species which gains electrons is said to be reduced.

The lead (IV) oxide is the formula of PbO₂. Here the oxidation state of lead is +4. The lead (IV) oxide is used in manufacturing dyes and also used to make explosives. It is a corrosive outcome that can evolve in lead pipes that are used for drinking water.

The formation of lead (IV) oxide is given as:

Pb (s) + O₂ (g) → PbO₂ (g)

Thus the reaction is an oxidation reaction.

To know more about oxidation reaction, visit;

https://brainly.com/question/29218241

#SPJ2

The option (b) is strong acid for Arrhenius theory.

The hydrogen ion (H⁺) is one of the electrically charged atoms or molecules that are produced when an acid dissociates in water, according to the Arrhenius hypothesis, which was first proposed by the Swedish scientist Svante Arrhenius in 1887. On the other hand, bases ionize in water to produce hydroxide ions (OH). It is now understood that in a solution of water, the hydrogen ion cannot exist alone but rather coexists with a water molecule to form the hydronium ion (H₃O⁺). The hydrogen ion is still the common name for the hydronium ion in everyday speech.

The basic characteristics of well-known hydroxides like sodium, potassium, and calcium hydroxides as well as the acidic behaviour of many well-known acids like sulfuric, hydrochloric, nitric, and acetic acids are explained in terms of their capacity to produce hydrogen and hydroxide ions, respectively, in solution. Furthermore, based on the proportion of hydrogen ions or hydroxide ions formed in solution, these acids and bases can be categorized as strong or weak acids and bases. A salt is created when an acid and a base mix, and water is created when a hydrogen ion and a hydroxide ion combine to produce that salt.

Therefore (b). strong acid

In Arrhenius theory, a strong acid is a substance that completely ionizes in aqueous solution to give H₃O⁺ (aq) and an anion. The H₃O⁺ ions, also known as hydronium ions, are responsible for the acidic properties of the solution. Examples of strong acids include hydrochloric acid (HCl), sulfuric acid (H₂SO₄), and nitric acid (HNO₃).

To know more about ionize:

https://brainly.com/question/31298750

#SPJ4

Answer:

6

Explanation:

Magnesium=24

helium= 4

24:4=6

True. Injection molding is indeed a process in which a polymer is heated to a highly plastic state and forced to flow under high pressure into a mold cavity, where it solidifies and is then removed from the cavity.

Injection molding is a commonly used manufacturing process for producing plastic parts in large quantities with high precision and consistency. The process involves melting a thermoplastic polymer resin and injecting it into a mold cavity under high pressure. The molten plastic is then cooled and solidified within the mold, and the finished part is ejected from the mold cavity.
Injection molding is a widely used process in the manufacturing industry, and it involves heating and injecting a polymer into a mold cavity under high pressure to create a solidified plastic part.

To know more about injection molding, click here

https://brainly.com/question/31498781

#SPJ11

Ester is the major product formed in the reaction involving an acid anhydride dissolved in alcohol.

Learn more about acid anhydride here:

https://brainly.com/question/3678985

#SPJ4

Wine was produced 37 years ago (1984 as usual year 15,2021) that is shown in the calculations below.

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

The time can be represented as follows:

t= 2.303\∧ log A0/A

∧= 0.693/t 1/2

The rate of a reaction is proportional to the reciprocal of the time taken. Rate α 1 time Rate is inversely proportional to time. Units: s-1, min-1 etc.

The given parameters are as follows:

t1/2=12.3

A0=5.5

A=0.688

t= 2.303/(0.693/12.3) log (5.5/0.688)

t=36.9

t=37 years

Thus, wine was produced 37 years ago (1984 as usual year 15,2021)

To learn more about rate of reaction check the link below:

https://brainly.com/question/24795637

#SPJ4

In the periodic table, group numbers are the number of valence electrons present in valence shells of an atom.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Learn more about periodic table,here:

https://brainly.com/question/11155928

#SPJ1

Answer:  CaCO3 = CaO  + CO2

Explanation:

 CaCO3 = CaO  + CO2

This is balanced already.

Elem      Reactant  Products

Ca                1                  1

C                  1                   1

O                  3                  3

Distillation, separates solutions based on the differences in boiling points of the components.

Based on the components of the mixture's varying affinities for a stationary phase and a mobile phase, chromatography separates solutions. The mobile phase is often a liquid or a gas, while the stationary phase might be either a solid or a liquid.

Contrarily, distillation divides solutions according to variations in the components' boiling points. The lower boiling point component will evaporate and ascend as a vapor when a combination is heated, whereas the higher boiling point component will remain in the liquid phase.

This technique takes advantage of the fact that various substances have varying boiling points. A purified component is then obtained by condensing and collecting the vapor.

Learn more about distillation:https://brainly.com/question/31829945

#SPJ4

A substance has 0. 0152088 moles per 10 grammes. One can use the equation grams = weight / molar mass to determine this. The volume of one mole of a chemical is represented by its molar mass on the chemical elements.

You would take its weight (10g) and multiply it by the material's molar mass to determine the number of molecules within 10g of a substance. For instance, if the material is water, its molar mass is 18. 015 g/mol, meaning that 10 g is comparable to 0. 555 molecules of water.

However, the formula moles = mass / molar weight can be used to determine the number of moles in an unit weight regardless of the substance. Therefore, there are 0. 0152088 mole in 10

To know more about Weight click here

brainly.com/question/10069252

#SPJ4

Answer:

It's a Sodium Atom

Answer:

all statements are true but scientifically depending on some assumptions

Explanation:

Each element has it's own atomic number that determine how electrons are distributed in shells. the more the shells of electrons, the bigger the atomic radius. Therefore the actual space occupied by an atom of an element fully depends on its atomic number

From the findings of Van Der Waal, the actual space occupied by a gas is less than the volume of the container. Reasons being the magnitude of the intermolecular forces between the gas molecules and volume of the molecules being almost negligible to the volume of the container

The weight percentage of piperazine in the commercial product is approximately 92.71%.

To calculate the weight percentage (wt%) of piperazine in the commercial product, we need to determine the mass of piperazine present in the precipitate and then calculate its percentage relative to the initial mass of the commercial product.

Given:

Mass of commercial product = 0.288 g

Mass of precipitate containing piperazine = 0.555 g

To find the mass of piperazine, we subtract the mass of the precipitate from the mass of the commercial product:

Mass of piperazine = Mass of precipitate - Mass of commercial product

= 0.555 g - 0.288 g

= 0.267 g

Now, we can calculate the weight percentage of piperazine:

wt% of piperazine = (Mass of piperazine / Mass of commercial product) x 100

Substituting the values:

wt% of piperazine = (0.267 g / 0.288 g) x 100

≈ 92.71%

Therefore, the weight percentage of piperazine in the commercial product is approximately 92.71%.

learn more about piperazine here

https://brainly.com/question/10817601

#SPJ11

Explanation:

use the formula:

moles = grams / molecular mass

molecular mass of CaSO4 is 136 g/mol

moles= 92,4 / 136 = 0,67 mol

Answer:

On July 4, 1776—the day the Declaration of Independence was approved by the Second Continental Congress—the prevailing mood was trepidation and fear.

Explanation:

Answer and Explanation:

When methane (CH4) and chlorine (Cl2) react, a substitution reaction takes place. Specifically, the reaction is a halogenation reaction, in which one or more hydrogen atoms in the methane molecule are replaced by chlorine atoms. The reaction can be represented by the following equation:

CH4 + Cl2 → CH3Cl + HCl

In this equation, CH3Cl represents chloromethane, which is a type of organochlorine compound. The reaction is typically initiated by ultraviolet (UV) light or heat, and it proceeds through a series of free radical chain reactions. The products of the reaction are typically a mixture of chloromethane and hydrogen chloride (HCl) gas.

Soil erosion is basically the soil being deteriorated by the gradual impact of water or wind to it, being a very mechanical situation, where water or wind will hit the soil, detaching some particles and making the soil weaker. The main cause will be hits from water or wind. Deforestation will have a huge impact on erosion, since the soil where trees are taken down is more likely to receive impacts from wind or water, if the trees were left in their place, they would be used as a "shield" for the soil

Answer: any answer choices

Explanation:

Answer:

Carbon

Explanation:

Therefore, the net ionic equation for the reaction is Copper(2+) (aq) + 2 chlorine- (aq) → Copper(II) chloride (aq).

Ammonium sulphate and Copper hydroxide precipitate are the first products of the reaction between copper sulphate and ammonium hydroxide.

Mixing copper(II) sulphate and ammonium chloride results in the following observations:

Conventional: When copper ions (Copper2+) from Copper(II) sulfate are present, a blue solution develops. The colour of Ammonium Chloride doesn't seem to have changed at all.

Ionic total: While Ammonium Chloride dissociates into Ammonium and Chlorine- ions in solution, Copper(II) sulfate dissociates into Copper2+ and Sulfate 2- ions.

Copper(II) sulfate (aq) + 2 Ammonium Chloride (aq) → Copper(II) Chloride (aq) + 2 Ammonium (aq) + Sulfate 2- (aq)

Net Ionic: The net ionic equation shows only the species involved in the reaction. In this case, the Copper2+ and the Cl- ions combine to form Copper(II) chloride.

Copper2+ (aq) + 2 Chlorine- (aq) → Copper(II) chloride (aq)

To know more about ionic equation visit:-

https://brainly.com/question/29299745

#SPJ1

Answer:

12 L of O₂.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

CS₂ + 3O₂ —> CO₂ + 2SO₂

From the balanced equation above,

3 L of O₂ reacted to produce 1 L CO₂.

Finally, we shall determine the volume of O₂ needed to produce 4 L of CO₂. This can be obtained as follow:

From the balanced equation above,

3 L of O₂ reacted to produce 1 L CO₂.

Therefore, xL of O₂ will react to produce 1 L CO₂ i.e

xL of O₂ = 3 × 4

xL of O₂ = 12 L

Thus, 12 L of O₂ is needed for the reaction.

1,640.  The number is rounded up because the digit in the tenths place is 8, which is greater than or equal to 5.

Rounding off is a mathematical process of replacing a number with an approximate value that has a shorter, simpler, or more explicit representation. It is often done to reduce the number of significant figures in a calculation or to make calculations easier. Rounding off is used in many everyday situations, such as calculating a restaurant bill or estimating the amount of paint needed to paint a room. It is also used in more complex calculations, such as in scientific and engineering calculations.

To learn more about rounded off
https://brainly.com/question/13993506
#SPJ1

280.53 L is the final volume in liters.

Applying the ideal gas equation for O₂

    PV = nRT  

where P is pressure, V is volume, n is the number of moles of gas, R is gas constant and T is temperature

As n and T are not changing

So,  

    P₁V₁ = P₂V₂  ⇒equation 1

now from the question we have,

Given data;

    P₁ = 20.8 atm, P₂= 2.70 atm

    V₁ = 26.3 L

now we have to find the volume of a gas when pressure is changed.

V₂ = ?  

Put values in equation 1

    20.8 × 26.3 = 2.70 × ?

     V₂ = 20.8 × 26.3 / 2.70

     V₂ = 280.53 L  

You can also learn more about ideal gas behavior from the following link;

https://brainly.com/app/ask

#SPJ4      

Answer  the ratio of Be to At is 1:2 in the compound

Explanation:

Be in Periodic Table 2A has 2 valence electrons in its outer orbital and needs to give them away.  When it gets rid of 2 negatives, its charge is +2.

At in Periodic Table 7A has 7 valence electrons in it outer orbitals and needs one more electron.  2 AT atoms each accept one electron from Be and each has a charge of -1.  The Be ion of +2 charge is balanced by the two At ions of -1 charge, so the ratio of Be to At is 1:2

Answer: Gas

Explanation:

Gas. The arrows represent direction. They are moving around in the box extremely fast, and are not compact like a solid or liquid.

Answer:

What is the density of a 40g object that has a volume of 2ml

Explanation:

20 g/mL

The density of a 40g object that has a volume of 2ml is 20g/ml. Details about density can be found below.

The density of a substance refers to the measure of the mass of matter contained by a unit volume.

The density of a substance is calculated by dividing the mass of the substance by its volume.

According to this question, a 40g object has a volume of 2ml. The density is calculated as follows:

Density = 40g ÷ 2mL

Density = 20g/mL.

Therefore, the density of a 40g object that has a volume of 2ml is 20g/mL.

Learn more about density at: https://brainly.com/question/15164682

#SPJ2