What is the mole concept in chemistry?

Q: description An element in Period 3 and Group 4A. A semimetal in Group 8A. An element in the nitrogen…

A: The periodic table is divided into groups (vertical columns), periods (horizontal rows), and…

Q: Determine the value of ΔSsurr at 303 K and assume constant pressure. Answer to 3 significant figures…

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Q: Draw a structural formula for 2,2-dimethyl-1-propanol. [Review Top

A: Since, For writing the structure of organic compound then follow the step- 1) First make carbon…

Q: f the half-life of cisplatin = 200 min. How many half-lives will it take for the concentration of…

A: The half-life of a substance undergoing first order kinetics is defined as the time it takes for the…

Q: Which compound H CI C=C X has the higher boiling point? Explain briefly. H H C=C Y CI X, because it…

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Q: Use the References to access important values if needed for this question. A 18.42 g sample of…

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Q: 6) What kind of molecular orbital (o, o, 7, or 7) results when the two atomic orbitals shown below…

A: In molecular orbital theory is the formation of molecular orbitals through the overlap of atomic…

Q: An example of a chiral center is a carbon that bears 4 different groups, and therefore has no…

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Q: What orbital does the lone pair on nitrogen sit in?

A: Answer:-'P' orbital •Lone pair electron of nitrogen in pyrrole is present in ' p orbital'. •Lone…

Q: Add curved arrow(s) to draw step 1 of the mechanism. Modify the given drawing of the product as…

A: In this question, we will add the curved arrows to show the reaction mechanism for step-1.

Q: 2. Calculate the number of moles of chlorine needed to form 14 moles of iron(III)chloride. 2Fe(s) 1…

A: Q2.  Given a reaction : 2Fe(s) + 3Cl2(g) = 2FeCl3(s) We have to calculate the number of moles of…

Q: A certain liquid has a vapor pressure of 92.0 Torr at 23.0 °C and 207.0 Torr at 45.0 °C. Calculate…

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Q: 4. Assign priorities to the groups in each set (1-highest, 4-lowest): 1. -CH₂CH3 -C(CH3)3 -OH 2.…

A: There are multiple questions of four questions asked. So, according to our guidelines, only first…

Q: A reaction has ΔrH∘=ΔrH∘= -136 kJmol−1kJmol−1 and ΔrS∘=ΔrS∘= 305 JK−1mol−1JK−1mol−1 .   At what…

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Q: A vessel of volume 22.4 dm³ contains 2.0 mol H₂ and 1.0 mol N₂ at 273.15K. Calculate (a) the mole…

A: Number of moles of H2 = 2.0 mol  Number of moles of N2 = 1.0 mol Total number of moles = 2.0+ 1.0 =…

Q: When 3.61 g of a nonelectrolyte solute is dissolved in water to make 375 mL of solution at 29 °C,…

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Q: Give example and explanation of each words: Standard Solution Supernatant liquid Abscissa Atomic…

A: A solution is a homogeneous mixture of two or more substances. In a solution, one substance is…

Q: In order for a molecule to exhibit dipole-dipole forces, molecule. permanent dipole oxygen double…

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Q: An Arrhenius plot was performed for a kinetics experiment. The plot yielded the following straight…

A: Given:- =>Straight line equation:-         y = -7749x + 20.6 => So firstly we write…

Q: Determine the concentration of all species at equilibrium for each of the following original…

A: Given: 2NOCl(g) ⇔ 2NO(g) + Cl2(g) The value of K is 1.7 x 10-5.

Q: The vapor pressure of Substance X is measured at several temperatures: temperature vapor pressure…

A: Given that -  The vapour pressures at different temperatures for substance X are -  Temperature…

Q: 1. For a two dimensional lattice with a₁ = a, (a) what is the area of a primitive cell? (b) show…

A: Solutions- Primitive cell area in two dimensional lattice.

Q: If 0.400 mol of N₂ (g) and 1.20 mol of H₂ (g) were placed in a 5.00 L container and underwent the…

A: Given, 0.400 mol of N2(g) and 1.20 mol of H2(g) were placed in a 5.00 L container and underwent the…

Q: The indicated o bond results from the overlap of which orbitals? H H H C C: C H H- O sp-sp² Ⓒsp²-sp²…

A: Since, In the molecule, single bond known as sigma bond. If double bond is present in it contain one…

Q: What is the size in cub

A: Given that, the size of the tank of a car is 5840 cm3. We have to calculate the size in cubic inch.

Q: Multiply the following measurement numbers and round the answer to the same number of significant…

A: Rules for determining the number of significant figures in an answer :   The result of an addition…

Q: A flask of ammonia is connected to a flask of an unknown acid HX by a 1.22  m glass tube (where "X"…

A: According to Graham's law of diffusion, the rate of diffusion of a gas is inversely proportional to…

Q: 27 L For the following reaction at a certain temperature H₂(g) + F₂(g) = 2HF(g) the equilibrium…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: 2. Determine the structures of the four products (two sub, two elim) that form in this reaction, and…

A: Given that, a reaction scheme is shown below We have to draw the structures of all the products…

Q: How many atoms of cadmium are in 1.00 g?

A: Mole is defined as weight of substance divide by it's atomic mass.…

Q: For each phase change, determine the sign of ΔPCH and ΔPCS. Use ΔH0, ΔS0. Explain 1. Freezing 2.…

A: For each phase change, determine the sign of ΔPCH and ΔPCS. Use ΔH<0, ΔH>0, ΔS<0 and…

Q: do 3 and 4 with detail mechanism in chem draw and explanation

A: We have to synthesized the below given compounds. 3. 4.

Q: Rank the following compounds in order of decreasing boiling point. Н- ННННН нн -с-н [[]>I>IV>II ©…

A: Introduction The boiling point of a substance is the temperature at which it changes its physical…

Q: Name these two molecules.

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Q: If F2 has has 5.70x10^25 particles, how many liters of gas are there at STP?

A: Given  Number of particles of F2 = 5.70×1025 particles Volume at STP = ?

Q: For each bond, show the direction of polarity by selecting the correct partial charges. Si-S CI-S…

A: Introduction Chemical polarity is a term used to describe the uneven distribution of electrons…

Q: Which is the molecular formula of a sample of a compound containing 6.444 g of boron (B) and 1.803 g…

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Q: 2. For the following pairs of ions, write the formula of the compound that you would expect them to…

A: Coordination chemistry is branch of chemistry in which we deal with d block element. In coordination…

Q: If you were to try to do an EAS bromination reaction directly on aniline you would get a variety of…

A: Electrophilic aromatic substitution (EAS) is the reaction where an electrophile (electron deficient)…

Q: Which compound(s) A B are anti-aromatic? Assume planarity. NH C N= D NH E

A: The structures of the given molecules are  Identify the molecules are which are anti-aromatic:

Q: Calculate the amount of heat needed to melt 129. g of solid ethanol (CH, CH₂OH) and bring it to a…

A: Given mass of ethanol = 129 g Melting point of ethanol = initial temperature = -114.1 oC Final…

Q: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. Polyatomic ion formula PO3-3 C103 CO3-2 SO42…

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Q: Check Your Learning A 248-g piece of copper is dropped into 390 mL of water at 22.6 °C. The final…

A: A 248-g piece of copper is dropped into 390 mL of water at 22.6 °C. The final temperature of the…

Q: What is the molality of a 0.726 M Pb(NO3)3 (MW=331.2 g/mol) solution if it has a density of 1.202…

A: Given:- Pb(NO3)2 => 0.726 M MW = 331.2 g/mol Density of solution= 1.202 g/ml

Q: ? 1. (CH3)3COK 2. CH3CH₂CH₂Br O

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Q: Consider the hypothetical reaction A+B+2C 2D+3E where the rate law is Δ[Α] At Rate == = k[A][B]² An…

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Q: In cyclooctatetrane, how many electrons are in nonbonding molecular orbitals?

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Q: What is the molality of the solution that contains 65 g of sucrose (C12H22O11) dissolved in 300g of…

A: Molarity is defined as moles of solute per kg of the solvent.

Q: What volume does a mixture of 14.3 g of He and 20.0 g of H₂ occupy at 27 °C and 0.987 atm? Volume =…

A: The given information is as follows: The mass of He = 14.3 g The mass of H2 = 20.0 g The temperature…

Q: particular element has two naturally occurring isotopes. The first makes up 20.000% of the total and…

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.