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Find the number of grams 9.30 x 10^-3 mole of SmO

The rate of effusion of a gas is inversely proportional to its molar mass.

Therefore, the gas with the molar mass closest to that of nitrogen (14 g/mol) will have the most similar rate of effusion to nitrogen at 350 K.

The gas with the molar mass closest to that of nitrogen is hydrogen (1 g/mol). Therefore, the gas with the most similar rate of effusion to nitrogen at 350 K is hydrogen (H2). The other gases (CH4, CO, CO2, and Ne)

all have molar masses significantly higher than nitrogen, and therefore they will have slower rates of effusion than nitrogen at 350 K.

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(a) The number of moles of oxygen gas (O₂) that reacted is 0.00325 mol.

(b) When the experiment is repeated without a lid on the crucible, the magnesium oxide produced will react with any oxygen present in the air.

(a) To calculate the number of moles of oxygen gas (O₂) that reacted, we need to first determine the number of moles of magnesium that reacted using its atomic mass:

Mass of magnesium (Mg) = 0.12 g

Atomic mass of Mg = 24.31 g/mol (from periodic table)

Number of moles of Mg = Mass of Mg / Atomic mass of Mg

= 0.12 g / 24.31 g/mol

= 0.00494 mol

The balanced chemical equation for the reaction between Mg and O₂ to produce MgO is:

2Mg + O₂ → 2MgO

From the equation, we can see that 2 moles of Mg react with 1 mole of O₂ to produce 2 moles of MgO.

Therefore, the number of moles of O₂ that reacted can be calculated as follows:

Number of moles of MgO produced = Mass of MgO / Molar mass of MgO

= 0.20 g / (24.31 g/mol + 16.00 g/mol)

= 0.00650 mol

Since 2 moles of MgO are produced from 1 mole of O₂, the number of moles of O₂ that reacted can be calculated as:

Number of moles of O₂ = Number of moles of MgO produced / 2

= 0.00650 mol / 2

= 0.00325 mol

(b) When the experiment is repeated without a lid on the crucible, the magnesium oxide produced will react with any oxygen present in the air. This will cause the mass of magnesium oxide produced to be greater than when the experiment was conducted with a lid on the crucible, as more oxygen will react with the magnesium.

Additionally, any water vapor or other gases present in the air may also react with the magnesium oxide, further affecting the mass of the final product. Therefore, the mass of magnesium oxide produced will be different without a lid on the crucible due to the presence of additional reactants in the air.

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Answer:

2.03 atm

Explanation:

Number of moles of He = 1g/4g/mol = 0.25 moles

Number of moles of F2 = 14.0g/38 g/mol = 0.37 moles

Number of moles of Ar=19.0g/40g/mol = 0.48 moles

Total number of moles = 0.25 + 0.37 + 0.48 = 1.1 moles

From;

PV=nRT

P= pressure of the gas mixture

V= volume of the gas mixture

n= total number of moles of the gas mixture

R= gas constant

T= temperature of the gas mixture

P= nRT/V

P= 1.1 × 0.082 × 293/13

P= 2.03 atm

Answer: The pH of [H30+] = 2.4 * 10 -3 M is 2.6

Explanation:

pH = 3 - log 2.4 = 2.6

Answer:

c

Explanation:

just got this question

Answer:

g HCN = MW HCN g/mole HCN * [8.00E19 molecules/6.022E23 molecules/mole HCN] = ??

EmForm = CaxPy

moles Ca = 0.66g / atwt Ca g/mole = ??

moles P = (1.00-0.66)g / atwt P g/mole = ??

x/y = moles Ca / moles P = ?? (express as ratio of two numbers; if both are not intergers multiply each by the same number that make them integers. This ratio gives the empirical formula.

Ca3P2

Plug and SOLVE

The Option C is correct precipitation is concentrated in the season

Hope it help

Answer:

C) precipitation is concentrated in one season

Explanation:

edge 2020

Each element has an emission spectra because of different electron energy and transitions.

First and foremost, we must comprehend what emission spectra are and why they exist.

The spectrum of frequencies of electromagnetic radiation released by an atom or molecule transitioning from a high energy state to a lower energy state is known as the emission spectrum of a chemical element or chemical compound.

So, as an electron moves from a higher energy state to a lower energy state, it emits an electromagnetic wave in the form of a photon, which is light.

In the case of hydrogen, there is only one electron, and that electron moves from a higher energy state to a ground state, resulting in the emission spectrum of a hydrogen atom.

Now, in the instance of sodium metal or sodium element, there are a total of 11 electrons present, therefore 11 can travel into higher energy states before returning to the ground state. So, the amount of electrons that can be stimulated between this and element is the difference.

Each atom has several different electron transitions, each with a different energy difference. An emission spectrum is a collection of distinct transitions that result in different radiated wavelengths. As a result, the emission spectra of each element differs from one another.

As a result, each element has a distinct emission spectrum.

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Explanation:

So copper is a lattice of positive copper ions with free electrons moving between them. 

The volume of bag in plane will be 181 ml.

The volume and pressure are inversely related with each other. Representing the equation -

\( P_{1}\) \( V_{1}\) = \( P_{2}\) \( V_{2}\). The values on LHS are initial pressure and volume. The values on RHS are final pressure and volume.

Keep the values in formula -

150 × 760 = 630 × \( V_{2}\)

Rewriting the equation as per \( V_{2}\)

\( V_{2}\) = (150 × 760) ÷ 630

Performing multiplication in numerator followed by division in fraction

\( V_{2}\) = 114,000 ÷ 630

\( V_{2}\) = 181 ml

Thus, the final volume is 181 ml.

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\(\huge{\mathbb{\tt {QUESTION:}}}\)

What makes a radioactive decay chain end?

OA. The final element has the longest half-life.

OB. All mass has been converted to energy.

OC. The radiation is absorbed by something.

OD. The final product is not radioactive.

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D. The final product is not radioactive

\(\huge{\mathbb{\tt {EXPLANATION:}}}\)

A radioactive decay chain will end when the last particle formed is stable. The initial radioactive isotope is called the parent isotope.

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A decay chain will end only when the final product is not radioactive.

The term radioactivity has to do with the sponteanous disintegration of an atom with the emission of radiation. Usually, there are radioactive decay series for different isotopes.

A radioactive decay series will continue untill a stable isotope is formed hence, a decay chain will end only when the final product is not radioactive.

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The ratio of argon-40 to potassium-40 two half-lives after the rock has formed is 7:1.

The half-life of a radioactive compound tells us the time needed for half of the atoms of any compound to go through the radioactive decay.

We know that, half-life of potassium-40 is 1.25 billion years because this is how long it takes for half of the number of atoms which are present in the sample to decay to argon-40.

The half-life of potassium-40 which decays by the beta emission is 1.28 × 10⁹ years. The half-life of potassium-40 which decays by the positron emission is 1.19 × 10¹⁰ years.

40 K which naturally occurs decays to the stable 40 Ar which is 11.2%, It happens by the capture of electron and by positron emission. It gets decayed to stable 40 Ca (88.8%) by emission of negatrons. Half-life of 40 K 1.25 x 10⁹ years.

The dating method of potassium-argon is specifically useful in determining the Lava age.

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Answer:

second one/ B

Explanation:

just took the quiz

Answer:b

Explanation:

The moles allow us to associate the microscopic scale of atoms to the macroscopic one to be able to make calculations of mass. The weight of a mole will depend on the element so it does not always weigh the same.

One mole will always represent 6.022x10^23 atoms according to Avogadro's number so the correct answer will be:

b. Because it always counts the same number of items

Answer:

1) 3Fe + 2O(2, this is the subscript) - Fe(3)O(4)

2) 2Sr + O(2) - 2SrO

3) Sn + 2NaOH - Na(2)SnO(2) + H(2)

4) 2K + Br(2) -2KBr

5) 2C(8)H(18) + 25O(2) - 16CO(2) + 18H(2)O

The Δ Hrxn, in kJ/mol, for this reaction= 11.04 kJ/mol

Given

0.848 g ammonium nitrate

The enthalpy change : +0.117 kJ

Required

Δ Hrxn, in kJ/mol

Solution

Delta H reaction (ΔH) is the amount of heat change between the system and its environment  

The value of ° H ° can be calculated from the change in enthalpy of standard formation:  

∆H ° rxn = ∑n ∆Hf ° (product) - ∑n ∆Hf ° (reactants)  

mass of NH4NO3 = 0.848 g

mol of NH4NO3(MW = 80 g/mol)

mol = 0.848 : 80

mol = 0.0106

The Δ Hrxn :

= 0.117 kJ : 0.0106 mol

= 11.04 kJ/mol

Answer:

the chemical formula of benzaldehyde is C₇H₆O

Ionic bonds occur between a metal and a nonmetal. In this type of bond, electrons are transferred from the metal atom to the nonmetal atom. The metal atom loses one or more electrons to become a positively charged ion, called a cation.

The transfer of electrons creates a strong electrostatic attraction between the oppositely charged ions, resulting in the formation of an ionic bond. The cations and anions are held together by this attraction, forming an ionic compound.

For example, consider the formation of sodium chloride (NaCl). Sodium, a metal, has one valence electron, while chlorine, a nonmetal, has seven valence electrons. Sodium donates its valence electron to chlorine, resulting in the formation of a sodium cation (Na+) and a chloride anion (Cl-). The positive charge of the sodium cation is attracted to the negative charge of the chloride anion, creating the ionic bond between them.

In summary, ionic bonds occur between a metal and a nonmetal. Electrons are transferred from the metal atom to the nonmetal atom, resulting in the formation of cations and anions. The electrostatic attraction between these charged ions forms the ionic bond.

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I think it's the D because you should prove it

Answer:

Accelerometer

Explanation:

Accelerometer are use to measure Acceleration

Answer: 6.45 Joules

Explanation: I just did it

The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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Answer:

electronegativity generally increase as you go from bottom to top group

Answer:

The reddish-brown substance is a different color than the fertilizer, which is white, and the substance that makes up the pipe, which is gray. This means that they cannot be the same substance because they do not have the same properties. The atomic models show that the reddish-brown substance is made up of different repeating groups of atoms than the fertilizer and the pipe substance. The difference in atoms caused the difference in properties.

Explanation:

lul

People of westfield identifying the reddish brown substance and that substance is rust i.e. iron oxide.

Rust is a chemical compound which is formed by the oxidation reaction between iron and oxygen for the formation of iron oxide.

People of westfield observed the reddish brown color in the water, that is the rust compound which is obtained by the chemical reaction occur between the iron pipes and the compound present in the fertilizers that are present in water.

Hence, the reddish brown substance in rust.

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According to capnography research, EtCO2 is part of the normal flow of carbon dioxide through the respiratory system.

End-tidal carbon dioxide, a parameter used in capnography, quantifies ventilation (EtCO₂). The pressure unit mm Hg (millimeters of mercury) is used to measure EtCO₂ values. No matter the patient's age, gender, race, or size, the normal values fall between 35 and 45 mm Hg, or around 5% CO₂.

When a patient has a high EtCO₂ reading at the beginning of treatment, a drop in that reading signifies improvement. If there is no change or an increase in EtCO₂, it means that respiratory effort is still insufficient to sufficiently remove CO₂ and that additional interventions are required.

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The concentration of [Hg2+] is 2.02 x\(10^-11 M\) and the concentration of [I-] is 4.04 x\(10^{11}\). The concentration of [K+] in the solution is equal to its initial concentration, which is 0.05 M.

The solubility product constant expression for K2[HgI4] can be written as follows:

Ksp =\([Hg2+][I-]^2\)

We can use stoichiometry to determine the initial concentration of [Hg2+] and [I-] in the solution:

0.05 M K2[HgI4] = 0.05 M K+ = 0.025 M  \(HgI4^2-\)

From the formula of K2[HgI4], we can see that each mole of K2[HgI4] contains 2 moles of K+ and one mole of  \(HgI4^2-\)          . Therefore, the initial concentration of \(HgI4^2-\)is 0.025 M.

We can assume that x is the concentration of [Hg2+] and 2x is the concentration of [I-] that dissociates from  \(HgI4^2-\). Therefore, the equilibrium concentrations are:

[Hg2+] = x

[I-] = 2x

Using the solubility product constant expression and substituting the concentrations:

Ksp =\([Hg2+][I-]^2\)

1.48 x\(10^-30 = x(2x)^2\)

x = 2.02 x\(10^-11 M\)

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Answer:

oxygen molecule has two oxygen atom . Each O atom share 2 electrons to form two covalent bonds out of which one is sigma bond and other is pi bond . sigma bond is formed by axial overlap 2p atomic orbitals of oxygen and pi bond is formed of lateral overlap of 2p atomic orbitals of oxygen .