Suppose a student is given 4.123 g
of a powered mixture to separate which contains iron shavings. The iron (Fe)
is removed from the mixture using a magnet and weighed on a balance. The mass of the iron is 1.213 g.
What is the mass percent of iron in the mixture?

Due to full outermost electron shell, noble gases become highly stable and unreactive.

Inert gases, also known as noble gases, are a group of elements that have low reactivity due to their stable electron configurations, making them unlikely to form chemical bonds with other elements.

Inert gases, also known as noble gases, do not readily form chemical bonds with other elements because their outermost electron shell is already full, making them highly stable and unlikely to lose or gain electrons. As a result, they have little chemical reactivity and do not easily form chemical compounds. This stability is due to their electronic configuration, which consists of a complete valence shell containing eight electrons, except for helium which has only two. This makes them less likely to gain or lose electrons, and hence less reactive.

To know more about inert gases, click here

https://brainly.com/question/14234951

#SPJ9

Therefore, approximately 267.9 mL of 0.170 M NaOH should be added to the 379 mL of 0.0481 M MOPS to obtain a pH of 7.55.

The following problem illustrates how the Henderson-Hasselbalch equation can be used to determine how much acid and conjugate base should be combined to create a buffer solution with a specific pH.

To calculate the volume of 0.170 M NaOH that must be added to the 379 mL of 0.0481 M MOPS to achieve a pH of 7.55, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where [A-] is the concentration of the deprotonated form of MOPS and [HA] is the concentration of the protonated form of MOPS.

At pH 7.55, we know that:

7.55 = 7.18 + log([A-]/[HA])

Solving for the ratio [A-]/[HA]:

0.37 = log([A-]/[HA])

2.42 = [A-]/[HA]

Next, we need to determine the concentrations of [A-] and [HA]. At the midpoint of a buffer, the concentrations of [A-] and [HA] are equal, so we can assume that:

[A-] = [HA] = 0.0481 / 2 = 0.02405 M

Now, we can use the equation for the amount of base added to a buffer to find the volume of 0.170 M NaOH required to achieve the desired pH:

Vbase = (Vbuffer × Cbase) / Cacid

where Vbuffer is the volume of the buffer solution, Cbase is the concentration of the NaOH solution, and Cacid is the concentration of the MOPS buffer.

Plugging in the values:

Vbase = (379 mL × 0.170 M) / 0.02405 M

Vbase = 2679 mL or 2.679 L

Converting to milliliters:

Vbase = 2679 mL × 1000 mL/L = 267900 mL or 2.679 L

To know more about NaOH visit:-

brainly.com/question/29854404

#SPJ1

The three factors A, B, and C are those that most likely allowed life to begin on Earth, Oxygen rich atmosphere.

A section of the Planet Earth Hall. Why is the Earth a habitable planet. It is at the ideal distance from the Sun, its magnetic field shields it from dangerous solar radiation, and an insulating atmosphere keeps it warm.

It not only protects us from harmful UV solar radiation but also gives us the oxygen we require to survive. Without it, the pressure needed for liquid water to exist on the surface of our planet would not be possible. Also, it warms our globe and maintains livable temperatures.

To know more about Oxygen visit:-

https://brainly.com/question/13370320

#SPJ1

3 moles of H2 are needed to produce 3 moles of water.

Moles are a unit of measurement that are used to determine how much of a chemical there is. The amount of a material that has the same number of particles (atoms, molecules, ions, etc.) is said to be one mole.

In order to create water (H2O), hydrogen gas (H2) and oxygen gas (O2) must react. The balanced chemical equation for this reaction is:

2H2 + O2 -> 2H2O

The stoichiometry of this reaction states that 2 moles of hydrogen gas and 1 mole of oxygen gas combine to form 2 moles of water. Therefore, we require 3/2 * 2 = 3 moles of hydrogen gas in order to make 3 moles of water.

So, 3 moles of H2 are needed to produce 3 moles of water.

To know more about moles, visit:

https://brainly.com/question/26416088

#SPJ9

Answer:

The statements that are true about unstable isotopes are:

They are radioactive.

They have an imbalance between protons and neutrons.

They may decompose.

Explanation:

An isotope is an atom that has the same number of protons as other atoms of the same element but a different number of neutrons. Some isotopes are stable, meaning they do not undergo any changes over time, while others are unstable or radioactive.

Unstable isotopes have an imbalance between the number of protons and neutrons in the nucleus, which makes them unstable and prone to breaking apart or decomposing. This process is called radioactive decay, and it can result in the emission of alpha or beta particles, gamma radiation, or other forms of energy.

The instability of the nucleus is due to the strong nuclear force that holds the nucleus together, which is overcome by the electrostatic repulsion between the protons. As a result, unstable isotopes are constantly trying to reach a more stable state by releasing energy in the form of radiation.

Because unstable isotopes can decompose, they have a limited lifespan, and their half-lives can vary from fractions of a second to billions of years. This property of unstable isotopes makes them useful in many fields, including medicine, geology, and nuclear energy.

Answer:

Explanation:

The statements that are true about unstable isotopes are:

They are radioactive.

They have an imbalance between protons and neutrons.

They may decompose.

The phosphoric acid solution has a molarity of 0.3067 M.

The most common measure for expressing solution concentration is molarity (M), which is calculated by dividing the solute's mass in moles by the volume of the solution in litres: litres of solution/moles of solute equals M.

The term "molarity" (M) refers to the quantity of solute in moles per litre of solution. A clean 1-L volumetric flask should be halfway filled with distilled or deionized water to create a 1 M solution. Slowly add 1 formula weight of the chemical to the flask. Let the compound to completely dissolve, gently turning the flask as needed.

To know more about molarity visit:-

https://brainly.com/question/8732513

#SPJ1

the partial pressure of COCl₂ at equilibrium is 10.25 atm. We are given the following information:

Initial mixture: 45% CO, 55% Cl₂

Total initial pressure: 10.25 atm

Equilibrium reaction: CO(g) + Cl₂(g) ⇌ COCl₂(g)

The equilibrium constant (Kp) = 22.5 (for pressures in atm)

Let's use the following variables to represent the equilibrium concentrations (in atm) of the gases:

[P_CO] = partial pressure of CO

[P_Cl2] = partial pressure of Cl₂

[P_COCl2] = partial pressure of COCl₂

At the start of the reaction, we have:

[P_CO] = 0.45 x 10.25 atm = 4.6125 atm

[P_Cl2] = 0.55 x 10.25 atm = 5.6375 atm

[P_COCl2] = 0 atm (since no COCl₂ is present initially)

At equilibrium, the partial pressures will have adjusted according to the equilibrium constant (Kp) and the stoichiometry of the reaction. Let's assume that x atm of COCl₂ forms at equilibrium. Then, using the stoichiometry of the reaction, we can write:

[P_COCl2] = x atm

[P_CO] = (4.6125 - x) atm

[P_Cl2] = (5.6375 - x) atm

We can now use the equilibrium constant expression to solve for x:

Kp = [P_COCl₂]/([P_CO] x [P_Cl₂])

22.5 = x / ((4.6125 - x) x (5.6375 - x))

22.5 (4.6125 - x) (5.6375 - x) = x

572.71594 - 28.125x + x²= x

x² - 29.125x + 572.71594 = 0

Using the quadratic formula, we get:

x = (29.125 ± sqrt(29.125² - 4 x 1 x 572.71594)) / 2

x = 18.458 atm or 11.667 atm

Since x represents the partial pressure of COCl₂, it cannot be negative, so we must choose the positive root:

x = 18.458 atm

Therefore, at equilibrium, we have:

[P_COCl2] = 18.458 atm

[P_CO] = (4.6125 - 18.458) atm = -13.8455 atm (negative value indicates that no CO is present at equilibrium)

[P_Cl2] = (5.6375 - 18.458) atm = -12.8205 atm (negative value indicates that no Cl₂ is present at equilibrium)

However, negative partial pressures are not physically meaningful. This indicates that our assumption that x atm of COCl₂ forms at equilibrium is incorrect. Instead, all of the CO and Cl₂ must have reacted to form COCl₂. Therefore, at equilibrium:

[P_COCl₂] = [CO] = [Cl₂] = 10.25 - 0 = 10.25 atm

So the partial pressure of COCl₂ at equilibrium is 10.25 atm.

To know more about partial pressure, visit:

https://brainly.com/question/31214700

#SPJ1

Answer:

D

Explanation:

got it right on the test

The number of mole of HNO₃ that will be produced from the reaction of 57.0 g of NO₂ with excess water is 0.826 mole

First, we shall obtain the number of mole in 57.0 g of NO₂. This shown below:

Mole = mass / molar mass

Mole of NO₂ = 57 / 46

Mole of NO₂ = 1.239 mole

Finally, we shall determine the number of mole of HNO₃ produced. Details below:

3NO₂(g) + H₂O(l) → 2HNO₃(g) + NO(g)

From the balanced equation above,

3 moles of NO₂ reacted to produce 2 moles of HNO₃

Therefore,

1.239 mole of NO₂ will react to produce = (1.239 × 2) / 3 = 0.826 mole of HNO₃

Thus, we can conclude that the number of mole of HNO₃ produced is 0.826 mole

Learn more about number of mole:

https://brainly.com/question/13375719

#SPJ1

there are an infinite number of ways to synthesize an answer to a question, including the following:

Summarize the key points in a concise manner.

Provide a detailed explanation of the topic.

Use examples or analogies to illustrate the concept.

Break down the answer into smaller, more digestible pieces.

Address potential counterarguments or alternative perspectives.

Incorporate relevant statistics or data to support the answer.

Compare and contrast different aspects of the topic.

Provide historical context or a timeline of events.

Use a storytelling approach to engage the reader.

Use a Q&A format to organize the information.

To know more about answer synthesize, visit:

https://brainly.com/question/30029537

#SPJ1

Lithium-7 has 3 protons and 4 neutrons, carbon-6 has 2 protons and 4 neutrons, while beryllium-8 has 4 protons and 4 neutrons.

No matter how many neutrons or electrons are present, the nucleus of a lithium atom always has three protons. The atomic number for lithium is always 3, which is evident given that the lithium atom always has three protons. Yet, the mass number in the isotope with 3 neutrons is 6 and in the isotope with 4 neutrons is 7.

Negatively charged subatomic particles include electrons. A category of subatomic particle having a positive charge is the proton. The strong nuclear force holds the protons together in the atom's nucleus. A subatomic particle with no charge is called a neutron (they are neutral).

To learn more about protons and neutrons visit:

brainly.com/question/29248303

#SPJ9

The osmolarity of a 0.50 M MgSO4 solution is 1.50 osmol/L.

To calculate the osmolarity of a solution of magnesium sulfate (MgSO4) with a concentration of 0.50 M, we need to consider the number of particles that contribute to the osmotic pressure in the solution.

MgSO4 dissociates in water to form three ions: one magnesium ion (Mg2+) and two sulfate ions (SO42-).

So, the total number of particles that contribute to the osmotic pressure in the solution is 1 (Mg2+) + 2 (SO42-) = 3.

Therefore, the osmolarity of a 0.50 M MgSO4 solution would be 0.50 M x 3 = 1.50 osmol/L.

Learn more about osmolarity at:

https://brainly.com/question/13258879

#SPJ1

5 moles of Oxygen gas must totally react with 224 litres of Hydrogen gas at STP.

There is nothing in front of this, thus we may place a one. I get three moles of Carbon dioxide and four moles of Water from one mole of this and five moles of Oxygen. According to Avogadro's law, a mole of any gas has a 22.4 L volume at STP.

2Hydrogen(g) + Oxygen (g) → 2Water (g)

From the equation, we can see that 2 moles of Hydrogen are required to react with 1 mole of Oxygen.

Therefore, to react completely with 5 moles of Oxygen, we need:

5 moles Oxygen × 2 moles Hydrogen / 1 mole Oxygen = 10 moles Hydrogen

At STP (standard temperature and pressure), 1 mole of any ideal gas occupies 22.4 L. Therefore, 10 moles of Hydrogen would occupy:

10 moles H2 × 22.4 L/mole = 224 L

To know more about STP visit:-

https://brainly.com/question/24050436

#SPJ1

This reaction can be represented by the following equation: H₃PO₄ + OH⁻ → H₂PO₄⁻ + H₂O

Buffer solution resists the changes in pH when small amounts of acid/ base are added.

In the case of buffer made from H₃PO₄ and NaH₂PO₄, the H₃PO₄ will act as weak acid, and NaH₂PO₄ will act as its conjugate base.

When base is added to this buffer solution, it will react with weak acid (H₃PO₄) to form its conjugate base (H₂PO₄⁻ ) and water (H₂O). The H₂PO₄⁻ ion will then act as weak acid and react with any additional base added to buffer. This reaction can be represented by the following equation: H₃PO₄ + OH⁻  → H₂PO₄⁻  + H₂O

OH⁻  represents any hydroxide ion that may be added to the buffer solution.

To know more about buffer solution, refer

https://brainly.com/question/8676275

#SPJ1

The advantage of using telescopes launched into orbit around Earth or sent out into deep space is that the images gathered are usually clearer because they do not have to look through our atmosphere.

What is an atmosphere?

The atmosphere can distort and blur images, making it difficult to observe distant objects with high precision. By placing telescopes in space, scientists can avoid this problem and obtain much clearer and more detailed images of objects in the universe. Additionally, space telescopes can observe a wider range of the electromagnetic spectrum, including ultraviolet and infrared radiation, which are absorbed by Earth's atmosphere.

What is telescopes?

A telescope is an instrument used to observe and study distant objects in space by collecting and focusing electromagnetic radiation. Telescopes can be used to study visible light, infrared radiation, ultraviolet radiation, X-rays, and other forms of electromagnetic radiation. They are important tools in astronomy and have helped scientists make many discoveries about the universe. There are many different types of telescopes, including refracting telescopes, reflecting telescopes, and radio telescopes.

To know more about atmosphere, visit:

https://brainly.com/question/28310375

#SPJ1

Balanced net ionic equation for this reaction is : Zn(s) + 2Ag⁺(aq) -> Zn²⁺(aq) + 2Ag(s)

Solid electric conductor that carries electric current into the non-metallic solids, liquids, gases , plasmas or vacuums is called a electrode.

To set up the cell, you will need:

Zn electrode (solid zinc metal) in 1.0 M aqueous Zn⁺ solution on left side

Ag electrode (solid silver metal) in 1.0 M aqueous Ag+ solution on right side

Salt bridge (such as a U-shaped tube filled with a solution of KCl or NaCl)

To set up the cell, connect the Zn electrode to negative (-) terminal of voltmeter and the Ag electrode to positive (+) terminal of voltmeter. Then, connect two electrodes with salt bridge.

Balanced net ionic equation for this reaction is: Zn(s) + 2Ag⁺(aq) -> Zn⁺(aq) + 2Ag(s)

This reaction involves oxidation of zinc (Zn) at Zn electrode, where Zn atoms lose electrons and form Zn⁺ ions: Zn(s) -> Zn²⁺(aq) + 2e⁻

Electrons flow through the external circuit to Ag electrode, where Ag⁺ ions are reduced to solid Ag atoms, gaining electrons: 2Ag⁺(aq) + 2e⁻ -> 2Ag(s)

To know more about electrodes, refer

https://brainly.com/question/18251415

#SPJ1

The correct answers are: 1,1,1,1; 1.524 mol; 22.4L; the mol ratio of CO to N2 is 1:1; the volume of N2 gas produced is 34.1 L.

The balanced chemical equation for the reaction is:

CO + NO ---> N2 + CO2, with coefficients from left to right being 1, 1, 1, and 1. Therefore, the answer is option A.

To calculate the number of moles of CO, we need to divide the given mass by its molar mass. The molar mass of CO is 28.01 g/mol. Thus, the number of moles of CO is 42.7 g / 28.01 g/mol = 1.524 mol.Therefore, the answer is option B.

The volume of 1 mol of any gas at STP (standard temperature and pressure) is 22.4L. Thus, the answer is option B.

To solve for the volume of N2 gas produced, we need to use the coefficients in the balanced equation to determine the mole ratio of CO to N2. The coefficient for CO is 1, and the coefficient for N2 is also 1. Therefore, the mole ratio of CO to N2 is 1:1.

Since 1.524 mol of CO is reacted, an equal number of moles of N2 is produced. Thus, the number of moles of N2 is also 1.524 mol. To convert moles to volume at STP, we can use the volume of 1 mol of any gas at STP (22.4 L). Thus, the volume of N2 gas produced is 1.524 mol × 22.4 L/mol = 34.1 L. Therefore, the answer is not given in the options.

Learn more about moles here:

https://brainly.com/question/26416088

#SPJ1

As a result, the Methylamine buffer solution has a pH of roughly 10.50.

There is a 0.20 M solution. Let represent the methylamine's level of ionisation. Therefore, the solution's pH value is 11.50.

The Henderson-Hasselbalch equation is used to determine a buffer solution's pH:

pH = pKa + log([A-]/[HA])

In this situation, Methylamine is a weak base, while Methylamine is its conjugate. So, using the Kb value of Methylamine, we must calculate the pKa of Methylamine:

Kb = [Methylamine][hydroxide-]/[Methylamine]

pKb = -log(Kb) = -log(3.7x10⁻⁴) = 3.43

pKa + pKb = 14

pKa = 14 - pKb = 14 - 3.43 = 10.57

The Henderson-Hasselbalch equation is now applicable:

pH = pKa + log([A-]/[HA])

pH = 10.57 + log(0.28/0.33)

pH = 10.57 - 0.07

pH = 10.50

To know more about buffer solution visit:-

https://brainly.com/question/24262133

#SPJ1

Answer:

C- CARBON COMPONENTS ARE IN 2 ATOMS

H- HYDROGEN IS 6

Explanation:

C IS THE ELEMENTIC FORMULAE AND C2 IS THE MOLECULAR FORMULAE.

H IS HYDROGEN AND H6 MOLECULAR FORMULAE

The actual yield of NaCl produced in the reaction is 9.85 g.

A combination reaction is a type of chemical reaction in which two or more substances react to form a single new substance. In other words, the reactants combine or "combine together" to form a product. This type of reaction is also sometimes referred to as a synthesis reaction. Combination reactions often involve the transfer of electrons from one reactant to another, and may involve the breaking and forming of chemical bonds. The general form of a combination reaction can be written as:

A + B → AB

The balanced chemical equation for the reaction of sodium (Na) with chlorine (Cl₂) to form sodium chloride (NaCl) is:

2Na + Cl₂ → 2NaCl

To determine the limiting reactant, we need to first calculate the number of moles of each reactant:

Number of moles of Na = 8 g / 23 g/mol = 0.348 moles

Number of moles of Cl₂ = 8 g / 71 g/mol = 0.113 moles

According to the stoichiometry of the balanced equation, 2 moles of Na react with 1 mole of Cl₂ to produce 2 moles of NaCl. Therefore, the number of moles of NaCl that can be produced from the given amounts of reactants is limited by the amount of Cl₂ present.

The theoretical yield of NaCl can be calculated based on the limiting reactant, which in this case is Cl₂:

Moles of NaCl = 0.113 moles Cl₂ x (2 moles NaCl / 1 mole Cl₂) = 0.226 moles NaCl

Mass of NaCl = Moles of NaCl x Molar mass of NaCl

Mass of NaCl = 0.226 moles x 58.44 g/mol = 13.22 g

The actual yield of NaCl is given to be 74.5% of the theoretical yield:

Actual yield = 74.5% x 13.22 g = 9.85 g

To know more about combination reaction, click here?

https://brainly.com/question/3664113

#SPJ1

Answer:

formula

Explanation:

the mistake is in formula please check

actual yeild = 0.493 moles NaCl

mistake

here