How many moles are in 0.0723 atoms of Iron. Fe?-

2H2O2 (aq) 2H2O(aq) + O2 is the overall reaction (g)

OI- Intermediate

The molecularity of the RDS is 2

A reaction mechanism has to do with the way that the sequence of elementary reactions are taking place as we can see here.

The rate of a reaction, the energy changes that take place throughout the reaction, and the variables that affect the reaction can all be learned a lot from the reaction mechanisms. Additionally, they can serve as a guide for creating more effective and focused chemical processes as well as an aid in explaining the behavior of a chemical reaction as it is observed.

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Answer:

A- antimony

Explanation:

Answer:

A

Explanation:

Answer:

Aluminium (A1) -Used in the production of duralumin alloy for use in the construction of aeroplane bodies. 3. Silicon (Si) -To make microchips 4. Sulphur (S) -To make matches, fireworks and for the manufacture of sulphuric acid 5.

Explanation:

Hope this helped!

Answer:

yes

Explanation:

we use different elements and compounds in our life ex salt and iron but most of the substances found in our environment are mixture btw scientists need to classified substances to work with our substances and to study pure substances hope it helps u

Answer: F : Gas

Explanation:

Answer: it’s c

Explanation:

The molar mass of a substance can be calculated from its density alone if that substance is a gas at STP.

The molar mass of a substance is the mass of one mole of that substance.

One mole of a substance is the amount of that substance that contains as many elementary entities as there are in 12 g of carbon-12.

The number of particles in 12 g of carbon-12 is the Avogadro number = 6.03 * 10²³ particles.

One mole of all gases occupies the same volume at STP.

Also, the molar mass of a gas is related to the vapor density of that gas by the formula below;

Hence, the molar mass of a gas can be determined from the density of the gas by multiplying the vapor density of the gas. by 2.

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There are 0.5 moles of helium atoms present in 11.2 L of Helium gas at Standard Temperature Pressure.

At STP (Standard Temperature and Pressure), which is defined as 0°C (273.15 K) and 1 atm of pressure, one mole of any gas occupies a volume of 22.4 L. Therefore, we can use the following formula to calculate the number of moles of helium atoms present in 11.2 L of He gas at STP:

n = V/ Vm

where n is the number of moles of helium atoms, V is the volume of the gas (11.2 L), and Vm is the molar volume of the gas at STP (22.4 L/mol).

Substituting the values, we get:

n = 11.2 L / 22.4 L/mol

n = 0.5 mol

Therefore, there are 0.5 moles of helium atoms present in 11.2 L of He gas at STP.

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Answer:

The ocean is made up of salt water, which is a combination of fresh water, plus minerals collectively called "salts." These salts aren't just sodium and chloride (the elements that make up our table salt), but other minerals such as calcium, magnesium, and potassium, among others.

Explanation:The answer is since particles can be found in ocean water It is a compound, since it results from the combination of elements It is a solution

Answer:

54.21 mL.

Explanation:

We'll begin by calculating the number of mole in 0.242 g calcium carbonate, CaCO3.

This is illustrated below:

Mass of CaCO3 = 0.242 g

Molar mass of CaCO3 = 40 + 12 +(16x3) = 40+ 12 + 48 = 100 g/mol

Mole of CaCO3 =?

Mole = mass /Molar mass

Mole of CaCO3 = 0.242/100

Mole of CaCO3 = 2.42×10¯³ mole.

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

CaCO3 —> CaO + CO2

From the balanced equation above,

1 mole of CaCO3 decomposed to produce 1 mole CaO and 1 mole of CO2.

Next, we shall determine the number of mole of CO2 produced from the reaction.

This can be obtained as follow:

From the balanced equation above,

1 mole of CaCO3 decomposed to produce 1 mole of CO2.

Therefore,

2.42×10¯³ mole of CaCO3 will also decompose to produce 2.42×10¯³ mole of CO2.

Therefore, 2.42×10¯³ mole of CO2 were obtained from the reaction.

Finally, we shall determine volume occupied by 2.42×10¯³ mole of CO2.

This can be obtained as follow:

1 mole of CO2 occupies 22400 mL at STP.

Therefore, 2.42×10¯³ mole of CO2 will occupy = 2.42×10¯³ x 22400 = 54.21 mL

Therefore, 54.21 mL of CO2 were obtained from the reaction.

After 10 days, there will be approximately 15,625 radioactive atoms left.

What is radioactive?
The process through which an unstable nucleus loses energy through radiation is known as radioactive decay, also recognised as nuclear decay, radioactive contamination, radioactive disintegration, as well as nuclear disintegration. A substance that has unstable nuclei is regarded as radioactive. Alpha decay, beta decay, and gamma decay are three of the most frequent types of decay, and they all involve the emission of one or even more particles. Beta decay is a result of the weak force, while the nuclear force and electromagnetism are in charge of the other two mechanisms. Electron capture, which occurs when an unstable nucleus seizes an inner electron in one of the electron shells, is the fourth common type of decay.

This is because the half life of the nuclide is 2 days, meaning that after 2 days, half of the 100,000 atoms will have decayed and only 50,000 atoms will remain. After 10 days, the number will have halved 6 times, leaving 15,625 atoms (50,000/2^6).

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Answer:

iodine is 53

tellurium is 52

antimony is 51

Otin Is 50

Explanation:

The fluid-filled interior compartment of the thylakoid network is referred to as the: Lumen

The thylakoid lumen is an aqueous phase that is continuously enclosed by the thylakoid membrane. It is essential for photophosphorylation during photosynthetic activity. Protons are hyped across the thylakoids into the lumen during the light-dependent reaction, making it acidic down to pH 4. The lumen in the chloroplast is referred to as the stroma. The stroma is the whitish fluid that surrounds the grana (thylakoids stacks) within the chloroplast. A lumen is the chloroplast membrane that surrounds space. Light energy is captured by photosystems found in thylakoid membranes. The thylakoid membrane contains enzymes required for photosynthesis's light-dependent reactions. Hydrogen ions are pumped into the thylakoid space, or lumen, during these reactions.The thylakoid space has an acidic pH due to the high concentration of hydrogen ions.

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Answer:

0.208 mol B

Explanation:

There are 6.02 × 10^23 atoms in one mole of a substance, according to Avagadro's law.

According to this question, there are 1.25 x 10^23 atoms of Boron. This means that the number of moles in the Boron atom can be calculated thus:

number of moles (n) = number of boron atoms (nA) ÷ Avagadro's number

n = 1.25 x 10^23 ÷ 6.02 × 10^23

n = 0.2076 × 10^(23-23)

n = 0.208 × 10^0

n = 0.208 × 1

n = 0.208 moles of Boron

Answer:

4.2 gigagrams

Explanation:

kilo = 1,000

giga = 1,000,000,000

milli = .001

The solid commonly used as an inactive electrode in electrochemical cells is Graphite. So option b is the correct answer.

Graphite is often chosen as an electrode material because it is chemically inert, highly conductive, and has a stable structure. This makes it suitable for various electrochemical applications without affecting the overall cell reactions.

An inactive electrode, also known as an inert electrode, is an electrode that does not participate in the chemical reaction occurring in the cell but serves as a conductor for the flow of electrons.

The graphite working electrode, which can be employed as an anode or a cathode in various electrochemical applications, is renowned for its chemical stability, superior electrical conductivity, and high melting point.

So the correct answer is option b. Graphite.

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Answer:Because there are so many units for energy.

Explanation:

Answer:

Radioactive

Explanation:

They're more unstable than my home life

Aluminum hydroxide will breakdown in a sodium hydroxides solution because the [Al(OH)4] ion, a basic ion which is soluble in water, will develop as a result of the excess hydroxide.

In chemistry, a solution is a homogeneous combination of two or more compounds in their relative proportions, which may be constantly changed up to what is known as the limitation of solubility. Although combinations of gas and solids are possible, the term "solution" was mostly frequently used to refer to the liquid condition of matter.

When a solvent and just a solute, several chemicals, are combined, they form a solution. A solution is generated when a molecule and a solvents are combined.

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Answer:

a. The limiting reagent is NO2.

b. 126g of nitric acid can be produced.

Explanation:

1st) It is necessary to write the balanced equation:

From the balanced equation we know that 3 moles of NO2 (3x46g= 138g) react with 1 mol of water (18g/mol) to produce 2 moles of nitric acid (2x63g= 126g) and 1 mol of NO (30g/mol).

2nd) To calculate the limiting reagent it is necessary to use the given values and the stoichiometry of the balanced equation:

The 10.0g of NO2 will need 1.30g of H2O to react.

The 30.0g of H2O will need 230g of NO2 to react.

So, as we only have 10.0g of NO2 and 30.0g of H2O, the limiting reagent will be NO2.

3rd) Now, to calculate the theorical yield, we need to use the stoichiometry of the balanced equation using the limiting reagent:

1 mol of H2O produces 2 moles of nitric acid. With the molar mass of nitric acid (63g/mol), we can calculate the grams.

Finally, 126g of nitric acid will be produced if the reaction is 100% efficient (theoretical yield).

Answer:

1 sigma bond and 2 pi bonds

Explanation:

A triple bond is made up of 1 sigma bond and 2 pi bonds.

Given example is that of ethyne

Answer:

1 \(\sigma\) and 2π bonds

Explanation:

Always remember that

The general example is

N=N bond

Answer:

157 grams magnesium chloride

Explanation:

1.  We must first find the molar mass (g/mole) of magnesium chloride.  The molecular formula is MgCl2.

Add the elemental atromic weights for one molecule of the material:

1 Mg = 24.3

2 Cl = 2*(35.45) = 70.9

Total = 95.2 grams/mole

We can use this as a conversion factor by multiplying it times the moles we are asked to convert:  (1.65 moles MgCl2)*(95.2 grams/mole MgCl2).

The moles cancel, leaving us with 157 grams of magnesium chloride.

Answer: The Mass of an electron is 9.1093837 x 10^-31 kgs

Explanation:

Answer:

1 gold(III), 3 fluoride

Explanation:

The average atomic mass of the element X is [86.00 amu].

To calculate the average atomic mass, we need to multiply the mass of each isotope by its percent abundance, and then sum up these values.

For isotope X-84, we have 0.56% abundance, so we multiply 84 amu by 0.56/100 = 0.4704 amu.

For isotope X-86, we have 9.86% abundance, so we multiply 86 amu by 9.86/100 = 8.4836 amu.

For isotope X-87, we have 7.00% abundance, so we multiply 87 amu by 7.00/100 = 6.09 amu.

For isotope X-88, we have 82.58% abundance, so we multiply 88 amu by 82.58/100 = 72.4384 amu.

Summing up these values, we get:

0.4704 amu + 8.4836 amu + 6.09 amu + 72.4384 amu = 87.4824 amu.

Rounding this value to the hundredths place, the average atomic mass of the element X is 87.48 amu.

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The amino acid that has been shown from the reaction is alanine. Option A

Amino acids are organic compounds that serve as the building blocks of proteins. They are composed of an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a unique side chain, also known as the R-group. The R-group varies among different amino acids, giving each amino acid its distinct properties.

There are 20 standard amino acids that are in biological processes. They are used as precursors for the synthesis of various molecules, such as neurotransmitters, hormones, and nucleotides.

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Question A. How does the composition of the atmosphere change from year to year? most likely would be studied by a chemist.

The work of a chemist professional is based on examining the composition of the different materials and compounds that form the subject of study such as in this case the composition of the atmosphere.

Therefore, with this data, we can see that the work of a chemist professional is based on deciphering the composition of the different compounds that form the natural world.

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Answer:

nonpolar

Explanation:

A nonpolar solvent has the highest solubility with a nonpolar solute.

Answer:

Organelles are structures within a cell that perform specific functions like controlling cell growth and producing energy. Plant and animal cells can contain similar types of organelles. However, certain organelles can only be found in plant cells and certain organelles can only be found in animal cells.