Newest Physical Chemistry Questions

A conductivity cell has a resistance of 250 Ω when filled with 0.02 M KCl at 25°C and 105 Ω when filled with 6 x 10-5 M ammonium hydroxide solution. The conductivity of 0.02 M KCl solution at 25°C... more

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Physical Chemistry Chemistry

02/14/21

Calculate the freezing point of a solution when 370 grams of Ca3(PO4) is added to 3000mL of water.

Calculate the freezing point of a solution when 370 grams of Ca3(PO4) is added to 3000mL of water. (density of water is 1.00 g/mL). The Kf for water is 1.86°C/m and normal freezing point of water... more

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Physical Chemistry Chemical Equilibrium

01/06/21

Please Help Me Out

For CaF2(s) ⇌ Ca2+ (aq) + 2 F− (aq), K = 3.9 ×10−11 at 25 °C and the standard Gibbs energy of formation of CaF2(s) is −1167 kJ mol−1. Calculate the standard Gibbs energy of formation of CaF2 (aq)... more

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Physical Chemistry Chemistry

12/21/20

Is the decomposition of dinitrogen tetroxide to nitrogen dioxide is in equilibrium total pressure of 1.5 bar and a temperature of 298K?

State whether the decomposition of dinitrogen tetroxide to nitrogen dioxide is in equilibrium when the reaction is at a total pressure of 1.5 bar and a temperature of 298K. The mole fraction of... more

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Physical Chemistry Thermodynamics

12/18/20

Help please ASAP!

A sample consisting of 2.0 mol CO2 occupies a fixed volume of 15.0 dm3at 300 K. When it is supplied with 2.35 kJ of energy as heat its temperature increases to 341 K. Assuming that CO2 is described... more

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Physical Chemistry

07/15/20

A radioactive element disintegrated into half after 18 hours what will be the %of radioactive element after 42.5 hours

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Physical Chemistry Chemistry Biochemistry Acid Base

02/23/20

Electron Withdrawing vs Electron Donating groups

Hello, could someone please explain how to determine if an R group is more electron withdrawing or donating in a benzene ring (e.g. phenols etc.) (especially explain if oxygen is electrowithdraw or... more

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Physical Chemistry Organic Chemistry Electronegativity Dipole

07/17/19

Does the dipole moment increase or decrease by increasing the bond length?

It is established the dipole moment is a result of multiplication of the magnitude of charges (Q) and the distance between them (r). What I understand is that when an electron and a proton get... more

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Physical Chemistry Organic Chemistry

07/05/19

Why do branched chain compounds have lower boiling points than the corresponding straight chain isomers?

> The branched chain compounds have lower boiling points than the corresponding straight chain isomers. For example, > >- $\\ce{CH_3CH_2CH_2CH_2CH_3}$ - No branching-Pentane (n-pentane)... more

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Physical Chemistry Chemistry Electrons Quantum Mechanics

05/30/19

Physical Chemistry: Quantum Chemistry - Electrons

Calculate the position of the maximum in the radial distribution function for Li2+ in its ground state using the wave function, π-1/2(Z/a0)e-Zr/a0 where Z is the nuclear charge.

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Physical Chemistry Chemistry Quantum Mechanics

04/25/19

Physical Chemistry: Quantum Mechanics

An electron at energy level 5.0eV approaches a step potential of height 2.0eV. What are the probabilities that the electron will be reflected and transmitted?

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Physical Chemistry Organic Chemistry Reaction Mechanism

04/22/19

Stability of cyclobutyl methyl carbocation?

I know that cyclopropyl methyl carbocation is exceptionally stable compared to say, benzyl carbocation. But I want to know how stable is cyclobutyl methyl carbocation compared to say,... more

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Physical Chemistry Organic Chemistry Spectroscopy

04/12/19

Difference between intermediates and transition states?

Can someone please explain what exactly the difference between an intermediate and a transition state is? I understand that they are formed as part of the process in converting the reactants to... more

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Physical Chemistry Chemistry

06/22/14

Find No of Moles

Atomic Weight of two elements 'A' and 'B' respectively are 32 and 16 .They combine to form two gases AB2 and AB4 and the Mixture is found to have a vapor density of 38.4. the no of moles of AB2... more

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Physical Chemistry Chemistry

06/22/14

Calculate N

One mol mixture of Feo and Fe3o4 containing equal moles of each on reaction with excess 02 give 'n' moles of Fe2o3 . Calculate 'N'

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Physical chemistry

How many milliliters each of purified water and an isotonic sodium chloride solution should be used to prepare 30 mL of a 1% w/v isotonic solution o fentanyl citrate (E = 0.11)?

How many milliliters of a 0.9% solution of sodium chloride should be used in compounding the prescription?

Isotonic sodium chloride solution contains 0.9% w/v sodium chloride. If the E-value of boric acid is 0.52, what is the percentage strength (w/v) of an isotonic solution of boric acid?

A physician desires a dose of 10 mcg/kg of digoxin for an 8-lb newborn child. How many milliliters of an injection containing 0.25 mg of digoxin per milliliter should be given?

How to calculate the number of tablets to dispense to a patient weighing 147 lb?

How many tablets will the patient take for each dose?

For a solution that is 0.164 M NH3 and 0.102 M NH4Cl calculate the ph. of the solution

calculate the cell constant and degree of dissociation of ammonium hydroxide in the 6 x 10-5 M solution

Calculate the freezing point of a solution when 370 grams of Ca3(PO4) is added to 3000mL of water.