is a chemist has 1.87 moles of na2o and causes it to decompose into its constitiuent elemtns how many moles of na will form

The paper titled "Large-Area 2D Layered MoTe2 by Physical Vapor Deposition and Solid-Phase Crystallization in a Tellurium-Free Atmosphere" discusses a method for producing large-area, two-dimensional (2D) layered MoTe2 using physical vapor deposition (PVD) and solid-phase crystallization (SPC) in an atmosphere without the use of tellurium.

The researchers aim to overcome the challenges associated with the synthesis of MoTe2, particularly the limited availability and high cost of tellurium, which is commonly used in traditional synthesis methods. They propose a process that involves depositing molybdenum (Mo) and tellurium (Te) precursors onto a substrate using PVD and subsequently subjecting the deposited film to SPC in a tellurium-free atmosphere.

The results demonstrate the successful synthesis of large-area, high-quality 2D layered MoTe2 films without the need for tellurium. The films exhibit desirable structural and electronic properties, making them suitable for various applications in electronic and optoelectronic devices.

This research presents an alternative approach for the scalable synthesis of 2D layered materials and offers potential benefits such as reduced cost, improved sustainability, and broader accessibility to these materials for scientific and technological advancements.

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Given:

Crystal shield (CuSO4 . 5H2O) dissolves in water in the large tank.CuSO4′5H2O(s) → CuSO4 (aq) + 5H2O(l)0.01 mm = thickness of film layer24.3 g crystal/100 g water at 275 K, density 1140 kg/m3Diffusion of CuSO4 in dilute aqueous solution 3.6x10-10 m2/s at 275 K

Concentration can be taken at an average of 55.93 kmol/m3, water density 1000 kg/m3The mass of CuSO4 that dissolves per unit area per unit time is called flux.The transfer rate per unit area from the crystal surface to the bulk solution is given by;\(\frac{dn}{dt} = D.

A\frac{dc}{dx}\)Where, D is diffusion coefficient A is the area of the interfacec is the concentration of the diffusing species in the filmx is the direction of diffusion

From the given data, crystal density can be calculated as;\(\frac{24.3}{100+24.3}=0.1955\)

Now, we can calculate the mass transfer flux from the given data;\(\frac{55.93}{159.61}=\frac{C_{CuSO_4}}{1140}\)\(C_{CuSO_4}=39.76 kmol/m^3\)\(J = -D\frac{dc}{dx}\)

Since the inner film is saturated, \(c_0 = 39.76 kmol/m^3\)

At the outer surface, there is no CuSO4 present and the concentration gradient is;\(\frac{39.76-0}{0.01*10^{-3}}= 3.976*10^6 kmol/m^4\)\(J = -3.6*10^{-10}*3.976*10^6\)\(= -1.43456*10^{-3} kmol/m^2s\)

Thus, the mass transfer flux is -1.43456 * 10^-3 kmol/m^2s.

The transfer rate per unit area from the crystal surface to the bulk solution is -1.43456 * 10^-3 kmol/m^2s.

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If 120 cm³ of oxygen gas is collected at 713.3 mm Hg pressure, the volume of the dry gas at STP is 0.102 cm³.

To solve this problem, we will use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas:

PV = nRT

First, we need to convert the given conditions to the correct units. The temperature is already in Celsius, so we need to convert it to kelvins by adding 273.15:

T = 27 + 273.15 = 300.15 K

The pressure is given in millimeters of mercury (mm Hg), so we need to convert it to atmospheres (atm) to use in the ideal gas law. There are 760 mm Hg in 1 atm, so:

P = 713.3 mm Hg / 760 mm Hg/atm = 0.938 atm

Next, we can use the ideal gas law to find the number of moles of oxygen gas:

n = PV/RT = (0.938 atm)(120 cm³)/(0.08206 L·atm/(mol·K))(300.15 K) = 0.00454 mol

Finally, we can use the molar volume of a gas at STP (standard temperature and pressure) to find the volume of the dry gas at STP. At STP, the temperature is 273.15 K and the pressure is 1 atm. The molar volume of a gas at STP is 22.4 L/mol, so:

V = n(22.4 L/mol) = (0.00454 mol)(22.4 L/mol) = 0.102 cm³

Therefore, the volume of the dry gas at STP is 0.102 cm³.

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Answer:

binary fission

Explanation:

i just took the quiz

Answer:

wrong.

Explanation: charged atoms have have more electrons than neural because  they charge it . a  neural atom has eaqual number of electrons and neutrons.

hope this helps(^人^)

Answer:

1.3 M/s

Explanation:

Step 1: Given data

Step 2: Calculate the average rate of consumption of methane

Methane burns in excess oxygen according to the following equation.}

CH₄ + 2 O₂ ⇒ CO₂ + 2 H₂O

We can calculate the average rate of consumption of methane (r) using the following expression.

r = - Δn/V × t = - (nf- ni) / V × t

r = - (0 mol - 8.0 mol) / 2.00 L × 3.2 s = 1.3 M/s

The drift speed of electrons in this aluminum wire is 1.12 × 10⁻³ m/s.

The drift speed of electrons in a wire can be calculated using the following formula;

v_d = I/(n × A × q)

where; v_d = drift speed of electrons (m/s)

I = current (A)

n = number of the charge carriers per unit volume (m⁻³)

A = cross-sectional area of the wire (m²)

q = charge of each electron (C)

First, we need to calculate the number of charge carriers per unit volume (n) using the density of aluminum (ρ), its molar mass (M), and Avogadro's number (N_A);

n = (ρ × N_A) / M

Given; Cross-sectional area of the wire (A) = 4.0 mm² = 4.0 × 10⁻⁶ m²

Current (I) = 6.0 A

Density of aluminum (ρ) = 2.7 g/cm³ = 2.7 × 10³ kg/m³ (since 1 g/cm³ = 10³ kg/m³)

Molar mass of aluminum (M) = 27 g/mol

Avogadro's number (N_A) = 6.022 × 10²³ particles/mol

Charge of each electron (q) = 1.6 × 10⁻¹⁹

Let's calculate n first; n = (ρ × N_A) / M

n = (2.7 × 10³ kg/m³ × 6.022 × 10²³ particles/mol) / 27 g/mol

n = 1.186 × 10²⁹ electrons/m³

Now we can put in the given values, along with the calculated value of n, into the drift speed formula to find v_d;

v_d = I / (n × A × q)

v_d = 6.0 A / (1.186 × 10²⁹ electrons/m³ × 4.0 × 10⁻⁶ m² × 1.6 × 10⁻¹⁹ C)

v_d ≈ 1.12 × 10⁻³ m/s

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C

The trout will suffer from disease

Answer:

C

Explanation:

I got it correct on a quiz I did that had this question

Answer:

Dehydration reactions can be defined as the chemical reactions in which a water molecule is eliminated from the reactant molecule. The process of combination of two molecules with the elimination of water molecule is called dehydration synthesis.

Answer:

C

Explanation:

view the Attached photo i added to see how i got that answer

Answer:

3.15×18

56.7

................

0.34 kJ of heat are absorbed in total.

Chemically, ammonium nitrate has the following formula: \(NH_4NO_3\). It is a salt comprised of ammonium and nitrate ions that is white and crystalline. It is a solid that is extremely hygroscopic and highly soluble in water despite without generating hydrates.

The first step is to calculate the amount of moles of ammonium nitrate consumed. This can be done using the molar mass of ammonium nitrate:

Molar mass of ammonium nitrate = \((1 mol NH_4NO_3) * (80.04 g/mol NH_4NO_3) = 80.04 g/mol NH_4NO_3\)

Number of moles of ammonium nitrate consumed

\(\frac{(25.0 g NH_4NO_3)}{ (80.04 g/mol NH_4NO_3) }\\\\= 0.3125 mol NH_4NO_3\)

The sum of the heat absorbed per mole of ammonium nitrate and the moles of ammonium nitrate consumed represents the total heat absorbed.

Total heat absorbed =\((27 kJ/mol NH_4NO_3) * (0.3125 mol NH_4NO_3) = 0.34 kJ\)

Therefore, the total heat absorbed is 0.34 kJ

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Answer:

D on edge

Explanation:

just took test

The list of elements in order from most conductive to least conductive is; potassium (K), germanium (Ge), selenium (Se).

Conductivity is a property of metals. The more "metallic" an element is, the greater its conductivity.

The most metallic element in the list is Potassium hence it has the highest conductivity (1.4×107 S/m) followed by germanium which is a semiconductor (2000 S/m). Selenium has the least electrical conductivity.

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The binding energy of an atom of 90Kr is approximately 78 MeV per atom.


1. Calculate the total mass of protons and neutrons in the nucleus:
- 90Kr has 36 protons and 54 neutrons (90-36 = 54).
- Mass of protons: 36 * 1.007825 amu = 36.2817 amu
- Mass of neutrons: 54 * 1.008665 amu = 54.46791 amu
- Total mass of protons and neutrons: 36.2817 amu + 54.46791 amu = 90.74961 amu

2. Calculate the mass defect (difference between total mass and the actual mass of the atom):
- Mass defect: 90.74961 amu - 89.919517 amu = 0.830093 amu

3. Convert the mass defect to energy using Einstein's mass-energy equivalence equation (E = mc^2):
- 1 amu is approximately equivalent to 931.5 MeV.
- Binding energy: 0.830093 amu * 931.5 MeV/amu ≈ 773.159 MeV

4. Calculate the binding energy per nucleon (atom):
- Binding energy per atom: 773.159 MeV / 90 ≈ 8.59065 MeV
- Rounding to the nearest whole number: 9 MeV per atom (± 1)

The binding energy of an atom of 90Kr is approximately 9 MeV per atom (± 1).

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A Scientist test a small section of a carrot root to determine the type of molecules were present. the results showed that the molecule contained carbon , hydrogen , and oxygen . the option d is correct (d) both (a) and (c)

(a)the molecule are a type of carbohydrate (c) the carrot contains some type of sugar.

Carrot is one of the important root vegetable rich in bioactive compounds. carbohydrates are made up of carbon , hydrogen and oxygen. carbohydrates are sugar molecules. The main three carbohydrates : sugar , starches and fiber. The carrot vegetable we eat is the taproot of carrot plant. The sucrose is major transport and storage sugar but it convert into starch. Carbohydrates provides energy for living things.

Thus, A Scientist test a small section of a carrot root to determine the type of molecules were present. the results showed that the molecule contained carbon , hydrogen , and oxygen . the option d is correct (d) both (a) and( c)

(a)the molecule are a type of carbohydrate

(c) the carrot contains some type of sugar.

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The elements with the higher first ionization energy in each pair are Kr, Ca, As, and S.

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Answer:

The reaction rate in mol/sec is 0.005.

Explanation:

To determine the reaction rate in mol/sec, you need to first determine the number of moles of H₂ gas produced in the reaction. The volume of a gas at STP (standard temperature and pressure) is directly proportional to the number of moles of the gas, so you can use the volume of H₂ gas produced to calculate the number of moles.

At STP, 1 mole of a gas occupies a volume of 22.4 L. Therefore, the number of moles of H₂ gas produced in the reaction can be calculated as follows:

moles H₂ = 4.48 L / 22.4 L/mol = 0.2 mol

To determine the reaction rate in mol/sec, you need to divide the number of moles of H₂ gas produced by the time it took for the reaction to occur:

reaction rate (mol/sec) = 0.2 mol / 40 sec = 0.005 mol/sec

So, the reaction rate in mol/sec is 0.005.

Answer:

Yes

Explanation:

A compound is a pure substance composed of two or more different atoms chemically bonded to one another. A compound can be destroyed by chemical means. It might be broken down into simpler compounds, into its elements or a combination of the two.

Answer:

Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Objective observation: Measurement and data (possibly although not necessarily using mathematics as a tool)

Explanation:

Answer:

Modern science is typically divided into three major branches that consist of the natural sciences (e.g., biology, chemistry, and physics), which study nature in the broadest sense; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences

The pressure : 800 kPa

Boyle's law and Gay Lussac's law  

\(\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}\)

P1 = initial gas pressure (N/m² or Pa)  

V1 = initial gas volume (m³)  

P2 = gas end pressure  

V2 = the final volume of gas  

T1 = initial gas temperature (K)  

T2 = gas end temperature  

The pressure after the gas is compressed :

\(\tt \dfrac{100\times 6.4}{300}=\dfrac{P_2\times 2.4}{900}\\\\P_2=800~KPa\)

The pH of the solution will be 7.00, option (a).

To find the pH of the solution, we need to first calculate the moles of KOH and HCl in the solution.

Moles of KOH = (0.125 mol/L) x (0.050 L) = 0.00625 mol

Moles of HCl = (0.125 mol/L) x (0.050 L) = 0.00625 mol

Since KOH is a strong base and HCl is a strong acid, they will react in a 1:1 ratio to form water and a salt. The salt in this case is KCl.

KOH + HCl → KCl + H2O

Since both KOH and HCl are present in equal amounts, they will completely neutralize each other. This means that all of the KOH will react with all of the HCl to form water and KCl.

The resulting solution will be a solution of KCl in water. KCl is a neutral salt, so it will not affect the pH of the solution.

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A whorl is found in 16 listed for one of the fingers

A 10-finger classification method is the main one. Therefore, it must be applied when both hands' prints are present. The world's fingerprints might be classified into 1,024 groups using this technique.

Each hand's finger is assigned a unique number. The fingers of the right hand are numbered from one to five, beginning with the right thumb. They are numbered 6 through 10 on the left hand, beginning with the thumb. As an illustration, the left middle finger is numbered 8, and the right ring finger is numbered 4.

The precise finger and the print pattern are used for classification. Only if each finger has a whorl design is it assigned a value. The finger is assigned a value of zero if it has an arch or loop. If a finger has a whorl, not all fingers are valued equally. The value assigned to a finger with a whorl design is shown in the following chart.

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Answer:

C) 0.121 M

Explanation:

HCl + H₂O = H₃O⁺ + OH⁻

.121M              .121M

HCl is a strong acid . It will dissociate almost 100 % so the concentration of acid and hydronium ion formed will be equal . It is to be noted that hydronium ion is formed due to association of H⁺ and H₂O . H⁺ is formed due to ionisation of HCl .

So concentrtion of hydronium ion ( H₃O⁺ ) will be .121 M.

Answer:

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Astronomers studying the planet of Rhombus have detected sedimentary rock on its surface. One astronomer wonders if material in this sedimentary rock used to be in igneous rock deep in Rhombus's interior. Can igneous rock become sedimentary rock? Explain your answer

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igneous rocks can form ____, _____ and _____ rock

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Video Transcript

Okay so let's answer now the question. So we have here the igneous rock. So the igneous rock, it was formed when lava or magma, okay when magma or lava solidified. So the solidification of the lava or magma resulted to the igneous rock. Now Igneous rock can be sedimentary rock. So this is our first answer. So igneous rocks and sedimentary rocks when the igneous rocks became um ah through weathering and through erosion became sediments. If the igneous rock became sediments and the sediments undergo the process of lit defecation then it will become sedimentary rock. The next rock is we have metamorphic rocks. So Igneous rock can be metamorphic rock if there is an igneous rock that will be subjected in intense he and pressure. So this heat and pressure will transform these the igneous rocks into metamorphic rock and the last time or the next. The next thing is the igneous rock can become big news rock again. Okay so if the igneous rocks will be molten again and then after the molten rocks or the lava or magma solidifies, then it becomes igneous rock. So basically this is our answer. So igneous rock can be a symptom entire Iraq if it becomes sediments through um weathering and erosion and through lift ification process it becomes sedimentary rocks. Next through intensity and pressure. Igneous rock will become metamorphic rock. Next the igneous rock can be another igneous rock. If the big news if the previous igneous rock will be subjected to heat and it will be melted and then after that it solidifies again then it becomes another igneous rock. So here we go. These are the answers. Thank you for listening.

Answer:

240.1428

Explanation:

I hope this helps! :<

The ground state electron configuration of ground state gaseous neutral polonium is [Xe]. 4f14. 5d10.

The electron configuration of an element describes how electrons are disbursed in its atomic orbitals. Electron configurations of atoms observe a well-known notation wherein all electron-containing atomic subshells  are positioned in a sequence.

Eighty four electrons  successively occupy to be had electron shells (rings). Polonium is a radioactive metalloid in organization 16, length 6, and the p-block of the periodic table. Discovered in 1898 through the Curies, it turned into named after Poland. Polonium-209 has a half-lifestyles of 103 years.

The symbols used for writing the electron configuration begin with the shell wide variety (n) observed through the kind of orbital and in the end the superscript suggests what number of electrons are withinside the orbital. For example: Looking on the periodic table, you may see that Oxygen has eight electrons.

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Answer: 3.05L= V2

Explanation:

using

P1V1/T1=P2V2/T2

where p1= 345torr

T1, tempertaure= -15c+ 273=258K

T2, temperature= 36+ 273=309K

p2, Pressure= 468 torr

V2=???

P1V1/T1=P2V2/T2

v2=P1V1T2/T1P2= 345X3.46L X 309/ 258X 468=

V2=  3.05L

Answer:

James Hutton described the Law of Inclusions, which states that if one rock body (Rock B) contains fragments from another rock body (Rock A), then Rock B must be younger than the bits of rock it has.Garnets commonly contain many inclusions

Answer:

They are positively charged

Explanation:

Hope it will help you

Protons are the sub-atomic particles present within the nucleus of the atom. The protons determine the atomic number and carry a positive charge. Thus, options c and d are correct.

Protons have been discovered as the smallest unit or particle of the atom. They are present in the nucleus of the atom situated in the middle along with the neutrons. The protons alone are the characteristics to determine the atomic number and property of the element in the periodic table.

The protons have also been discovered to have a positive charge (+1) on them that binds the atom and electron by the attractive forces. They are heavier than the other particles and are the determinant of the chemical element.

Therefore, options c and d. protons are equivalent to atomic numbers and carry a positive charge is correct.

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The volume of the metal sample is 6.2 ml

The theory behind this is that the volume of the metal is what causes the increase in water volume in the cylinder.

This means that by comparing the volume occupied by the water and metal together and the amount occupied by the water alone in the cylinder, you can determine the volume of the metal.

To be more specific, the volume of the metal will be,

Vmetal= Vwater + metal - Vwater

In this case, we have

Vwater = 23.6 ml

Vwater + metal = 29.8 ml

So,

Vmetal = 29.8 ml - 23.6 ml = 6.2 ml

Thus the volume of the metal sample is 6.2 ml.

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