How many atoms of lead are in 3.5 moles of lead?

The new rate constant is 1.5 * 10^6  M-1s-1 .

In this case we know that we have to use the Arrhenius equation to find the rate constant at two different temperatures by the use of the formula;

ln(k2/k1) = -Ea/R(1/T2 - 1/T1)

k2 = Rate constant at  436 K

k1 = Rate constant at 249 K

T1 = initial temperature

T2  = final temperature

R = Gas constant

Ea = activation energy

Hence;

ln(k2/1.60 × 10^2) = -38 * 10^3/8.314(1/436 - 1/249)

ln(k2/1.60 × 10^2) =  -38 * 10^3/8.314(0.002 - 0.004)

ln(k2/1.60 × 10^2) =  9.14

k2/1.60 × 10^2 = e^ 9.14

k2 = e^ 9.14 * 1.60 × 10^2

k2 = 1.5 * 10^6  M-1s-1

Learn more about activation energy:https://brainly.com/question/11334504

#SPJ1

Cu + O2 --->  CuO2 -The first reaction is a combustion reaction

2 HCl + Mg → H2 + MgCl2- The second reaction is a Single replacement reaction

A combustion reaction is a type of chemical reaction that occurs between a fuel and an oxidizer in the presence of heat or light, resulting in the release of energy in the form of heat and light.

In other words, it is a reaction in which a substance reacts with oxygen to produce heat and light.

Combustion reactions are important in many aspects of daily life, including the burning of fossil fuels for energy production, the combustion of wood or other materials for heating or cooking, and the combustion of fuels in internal combustion engines.

Learn more about combustion reaction:https://brainly.com/question/30562669

#SPJ1

Answer:

3Mg(s) +2P(s) -------> Mg3P2(s) + energy

Keq= [Mg3P2]/[Mg]^3 [P]^2

Explanation:

The equation for the formation of magnesium phosphide from its elements is;

3Mg(s) +2P(s) -------> Mg3P2(s) + energy

Hence we can see that three moles of magnesium atoms combines with two moles of phosphorus atoms to yield one mole of magnesium phosphide. The equation written above is the balanced chemical reaction equation for the formation of the magnesium phosphide.

The equilibrium expression for the reaction K(eq) will be given by;

Keq= [Mg3P2]/[Mg]^3 [P]^2

Approximately 631.5 liters of dry air at 25°C and 750 torr would need to be processed to produce 150 liters of liquid \(O_2\) -183°C.

To solve this problem, we need to consider the ideal gas law and the molar volume of gases.

First, we can calculate the number of moles of oxygen in 150 L of liquid \(O_2\) at -183°C. To do this, we divide the mass of liquid oxygen by its molar mass:

Mass of liquid oxygen = volume of liquid oxygen * density of liquid oxygen = 150 L * 1.14 g/mL = 171 g

Molar mass of oxygen (O2) = 32 g/mol

Number of moles of oxygen = mass of oxygen / molar mass of oxygen = 171 g / 32 g/mol ≈ 5.34 mol

Since the mole fraction of oxygen in dry air is given as 0.21, we can calculate the total moles of dry air needed to produce 5.34 mol of oxygen:

Moles of dry air = moles of oxygen / mole fraction of oxygen = 5.34 mol / 0.21 ≈ 25.43 mol

Now, we can use the ideal gas law to calculate the volume of dry air at 25°C and 750 torr (convert to atm) that corresponds to 25.43 mol:

PV = nRT

P = 750 torr * (1 atm / 760 torr) ≈ 0.987 atm

V = volume of dry air (unknown)

n = 25.43 mol

R = 0.0821 L·atm/(mol·K)

T = 25°C + 273.15 = 298.15 K

Solving for V:

V = nRT / P = (25.43 mol)(0.0821 L·atm/(mol·K))(298.15 K) / 0.987 atm ≈ 631.5 L

For more such questions on dry air visit:

https://brainly.com/question/14247097

#SPJ8

Answer:3

Explanation: counting from left to right there is 3 sig figs.

Food energy is transformed into energy that the body's cells can utilise during cellular respiration. Energy is converted to ATP during cellular respiration, which transforms glucose and oxygen into carbon dioxide and water.

What kind of energy is used by your body to develop and maintain itself?

Your body can move its muscles when you ingest food, which enables you to breathe, walk, run, leap, lift objects, and perform all the other survival-related tasks. The mechanical energy of moving muscles is created from the chemical energy of food.

Your body can move its muscles when you ingest food, which enables you to breathe, walk, run, leap, lift objects, and perform all the other survival-related tasks. The mechanical energy of moving muscles is created from the chemical energy of food.

To know more about cellular respiration visit:

https://brainly.com/question/13721588

#SPJ9

Answer:

1600J

Explanation:

1 mole of oxygen gas (O2) has a mass of 32g i.e. the molar mass = 32g/mol

Kinetic energy (K.E) = ½ × m × v²

Where;

m = mass (g)

v = speed or velocity (m/s)

From the information given in this question;

m = 32g

V = 10m/s²

K.E = ½ × 32 × 10²

K.E = 16 × 100

K.E = 1600J

Answer:

2.5471951319999997

Explanation:

The solubility of many substances increases with temperature, there are exceptions. Some substances exhibit a decrease in solubility with temperature due to specific interactions or changes in solute-solvent interactions at higher temperatures.

The increase in solubility of many substances with temperature can be attributed to the effect of temperature on the kinetic energy and intermolecular interactions of molecules.

On a microscopic scale, an increase in temperature corresponds to an increase in the kinetic energy of molecules. As the kinetic energy increases, the molecules move more rapidly and collide with each other and with the solvent molecules more frequently and with greater force.

These increased collisions and kinetic energy result in enhanced molecular interactions and overcome the forces holding the solute particles together. This increased energy disrupts the intermolecular forces within the solute, allowing the solvent molecules to surround and interact more effectively with the solute particles, leading to greater solubility.

Additionally, an increase in temperature can cause solvent molecules to move more freely, reducing their cohesion and allowing them to interact more readily with solute particles.

for more questions on  solubility

https://brainly.com/question/24057916

#SPJ8

The covalent bond is present in the compound C₃H₈. The reactant C is 3, product C is 6, reactant H is 8, product H is 10, Reactant O is 2, product O is 9.

What is covalent bond ?

Atoms share electron pair between them in covalent bonds. H-H or C-H are examples of nonpolar covalent bonds between atoms with similar or identical electronegativity, whereas polar covalent bonds are formed when unequal electronegativity is shared between atoms (e.g., H–O).

What is reactant ?

Raw materials known as reactants combine to create products. When the right factors, such as temperature, time, or pressure, come into play, the chemical bonds between the reactants are broken, allowing the atoms to form new bonds that lead to various combinations.

Therefore, covalent bond is present in the compound C₃H₈. The reactant C is 3, product C is 6, reactant H is 8, product H is 10, Reactant O is 2, product O is 9.

Learn more about covalent bond from the given link.

https://brainly.com/question/3447218

#SPJ1

The diagram is correct because electrons are present in distinct energy levels around the nucleus. Option D

Let nus just take a minute to be able to remind ourselves that when we look at the atom that there are several subatomic particles that can be shown to be able to make up the atom. We know that the electron is the particle that can be shown to be arranged in shells.

What we saw in the inner or the core of the atom is the nucleus and the six grey spheres  that we can see there would have to do with the nucleus of the atom that is in the question.

As we now look up at the shells, we can see the electrons as they have been arranged into the respective shells were they can be found in the atom on the basis of the energy that they possess.

Learn more about atoms:https://brainly.com/question/13654549?

#SPJ1

Answer:

Fault-Block Mountain

Explanation:

just did test and got it correct UwU

The geologist is making observation from the fault block mountain so that she sees two parallel faults one from east and another from west.

Mountains with fault blocks are identifiable by their great sheer rock faces. These are created when a large rock mass separates from another due to intense subterranean pressure. The fault is the location on the line where this break occurs.

The rocks rise on one side of this breach and sink on the other. Fault blocks are very large blocks of rock, sometimes hundreds of kilometers in extent, created by tectonic and localized stresses in earth's crust. Large areas of bedrock are broken up into blocks by faults. Blocks are characterized by relatively uniform lithology.

The largest of these fault blocks are called crustal blocks. Large crustal blocks broken off from tectonic plates are called terranes. Those terranes which are the full thickness of the lithosphere are called microplates.

To find more on block mountains, refer here:

https://brainly.com/question/22964031

#SPJ6

Answer:

28

Explanation:

The grams of salt dissolved in the solution was 28, because 40 minus 12 would be 28. I know I'm suppose to subtract 40 by 12 considering the fact, it is 12 grams of salt that came out. The rest of the numbers are irrelevant. (apologies this is a week late.)

The amount of salt that was dissolved in the water is 28 grams of the salt.

The term solubility refers to the amount of a substance that dissolves in solution. In this case we are told that about  40-grams of salt was added to water but about 12 grams of the salt came out of the solution.

In this case, the amount of salt that was dissolved in the water is 40 g - 12 g = 28 grams of the salt.

Learn more about solubility: https://brainly.com/question/14356798

Answer:

45N, and B

Explanation:

Answer:

an object will continue in its state of motion unless an unbalanced force is acting on it. If forces are balanced, then the net force equals 0. This means that there is no acceleration.

Explanation:

Answer:

zwasetdrcyfvgybhuknjimk

Explanation:

Answer:

The chemical bond between atoms in metallic elements

Explanation:

Metallic bond is a bond that exist between metallic elements. It does not occur between metals and non metals.

Answer:

36704 $

Explanation:

First we calculate how much the worker gets paid in one week:

Then we calculate how many weeks does the worker work in 1.7 years:

Finally we calculate how much does the worker make in 1.7 years:

The first shown ionic compound has only two elements, Li and F.

On a periodica table, we can see that Li is on the first group, so it is the metal one.

F is on the 17th group, so it is the nonmetal.

We have only one of each of them, so the formula will only have one of each.

The formula is:

And we have 1 of each, so their ratio is 1:1.

The percentage of yield of K₂PO₄ obtained from the reaction of 49.0 g of H₃PO₄ is 46.2%

We'll begin by obtaining the theoretical yield of K₂PO₄. Details below:

H₃PO₄ + 3KOH -> K₃PO₄ + 3H₂O

From the balanced equation above,

98 g of H₃PO₄ reacted to produce 212 g of K₃PO₄

Therefore,

49 g of H₃PO₄ will react to produce = (49 × 212) / 98 = 106 g of K₃PO₄

Thus, the theoretical yield of K₃PO₄ obtained is 106 g

Now, we shall determine the percentage yield of K₃PO₄. Details below:

Percentage yield = (Actual /Theoretical) × 100

Percentage yield of K₃PO₄ = (49 / 106) × 100

Percentage yield of K₃PO₄ = 46.2%

Learn more about percentage yield:

https://brainly.com/question/29615581

#SPJ1

Answer:the correct answer is a.

According to the law of reciprocal proportions, they should combine in the ratio of 10.24:7.92:1.29 by mass.

According to the law of reciprocal proportions when two elements join to form more than one compound, the weights of one element that combine with a fixed weight of the another are in a ratio of small whole numbers.

In phosphine, phosphorus = 91.1 parts and hydrogen = 8.9 parts

So, 8.9 pads of hydrogen combine with phosphorus = 91.1 parts .

1 part of hydrogen combine =  91.1 / 8.9

= 10.24 parts

Similarly,

for water 88.8 / 11.2

= 7.92 parts of hydrogen

For Phosphorus tetra oxide

= 56.4 / 43.6

= 1.29 parts

Thus, According to the law of reciprocal proportions, they should combine in the ratio of 10.24:7.92:1.29 by mass.

To learn more about the law of reciprocal proportions, follow the link;

https://brainly.com/question/17062521

#SPJ1

The mass of the cereal that you would need to consume can be obtained as 84.8 g

The number of moles, denoted by the symbol "n," is a fundamental unit of measurement in chemistry that represents the amount of a substance. It is used to quantify the quantity of atoms, molecules, or ions in a sample.

Number of moles of sucrose in the cereal = 11g/342 g/mol

= 0.03 moles

Now;

0.03 moles of sucrose is contained in 60 g of cereal

0.0424 moles of sucrose would contain 0.0424 moles * 60 g/0.03 moles

= 84.8 g

Learn more about moles:https://brainly.com/question/15209553

#SPJ1

Answer:

1. Electron-deficient molecules

2. Odd electron molecules

3. Expanded valence shell molecules

Explanation:

Answer:

.

Explanation:

A light-year is how astronomers measure distance in space. It's defined by how far a beam of light travels in one year – a distance of six trillion miles. Think of it as the bigger, badder cousin of the inch, the mile, the kilometer, and the furlong.

Answer: the pressure releases gas. The two most abundant gases are sulfur dioxide and carbon dioxide, and if levels of these gases increase,

Explanation:

Answer:

Explanation:

Here, we want to get the product of the chemical reaction

In a chemical reaction equation, the reactants are written on the left-hand side before the arrow, while the products are written on the right-hand side after the arrow

What that means is that the two products we have here are:

Answer:

Al = 13.4%  Cr = 38.8%  O = 47.7

Aluminium Chromium Oxygen

Explanation:

im so sorry if i am wrong

Answer:

If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.