J.R. S.

Chemistry Biochemistry Organic Chemistry

03/27/20

Chemistry question about chemical equilibrium

Why is a chemical equilibrium considered a dynamic equilibrium? Because both forward and reverse reactions continue, even though there is no net change. Because there is no net change in the... more

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Chemistry

03/26/20

Chemistry MATH question 3

Determine the rate law and the value of k for the following reaction using the data provided. 2 NO(g) + O2(g) → 2 NO2(g) [NO]i (M) [O2]i (M) Initial Rate... more

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Chemistry

03/26/20

Chemistry MATH question 2

The first-order decomposition of N2O5 at 328 K has a rate constant of 1.70 × 10-3 s-1. If the initial concentration of N2O5 is 2.88 M, what is the concentration of N2O5 after 12.5 minutes?

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Chemistry Biochemistry Organic Chemistry

03/26/20

Chemistry MATH Question 1

A rate is equal to 0.0200 M/s. If [A] = 0.100 M and rate = k[A]0[B]2, what is the new rate if the concentration of [A] is increased to 0.200 M?

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Chemistry

03/26/20

Find the mass of AlCl3 that is produced when 25.0g of Al2O3 react with HCl

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Chemistry

03/26/20

5.00g of an unknown gas is collected at 20.0oC in a 1.00L container. It has a pressure of 2.733atm. What is the molar mass of the gas?

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Answers •3

Chemistry

03/26/20

A mixture of O2 and N2 has a total pressure of 2.30 atm. The mixture contains 0.750 moles of N2 and has a volume of 30.0L at 25.0 oC. What is the partial pressure of the O2in atm?

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Chemistry

03/26/20

if a 2.50L sample of air at 24.9 oC is heated until it's volume increases to 3.17, what is the new temperature in oC?

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Chemistry

03/26/20

Problem B (SW) What Osmotic Pressure (Pi) can be generated by a 2M sugar solution at 16oC. (hint) use Pi = MRT change 16oC to K R = .08 L Atm/mol K Your answer is over 1 ATM..

Problem B (SW) What Osmotic Pressure (Pi) can be generated by a 2M sugar solution at 16oC.(hint) use Pi = MRT change 16oC to K R = .08 L Atm/mol KYour answer should be greater that... more

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Chemistry

03/26/20

Problem A (SW) What if the freezing point of a sugar solution that is 2m? kf = 1.86 (hint) get the change in freezing pt. using Atf = (kf)(m) then subtract from zero

Problem A (SW)What if the freezing point of a sugar solution that is 2m? kf = 1.86(hint) get the change in freezing pt. using Atf = (kf)(m) then subtract from zeroyou should get a negative number... more

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Chemistry Thermodynamics

03/26/20

Enthalpy of solution for copper sulfate

Hi!I have calculated enthalpy of solution for hydrated copper sulfate and anhydrous copper sulfate, but the value for the hydrated copper sulfate differs from the value from anhydrous copper... more

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Chemistry

03/26/20

Give the name of the element with the electronic configuration 1 s 2 2 s 2 2 p 3 .

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Chemistry

03/26/20

Identify the atom with the ground-state electron configuration shown for its valence shell. 4 s 2 3 d 10 4 p 6

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Chemistry

03/26/20

Give the full electronic configuration for phosphorus.

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Chemistry

03/26/20

Give the full electron configuration for nitrogen.

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Answers •1

Chemistry

03/26/20

Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 5 to n = 1 .

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Chemistry

03/26/20

Find the change in freeze, molality of solution, # of mols, molecular weight for the problem below

Details-A sample, of a white powder found at Post Office, weighing .95g was mixed with 20g of Hexane. -Hexane has a freezing pt. of 6oC Kf Hexane is 5.2 -The solution was placed in a freezer; and... more

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Chemistry

03/26/20

Potential Diagram

help i need draw this but idk how H+(aq) + OH-(aq) 🡪H2O(l) △H=-55.8kJ

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Answers •1

Chemistry

03/26/20

Problem A (SW) What is the freezing point of a sugar solution that is 2m? kf = 1.86

Problem A (SW)What is the freezing point of a sugar solution that is 2m? kf = 1.86(hint) get the change in freezing pt. using Atf = (kf)(m) then subtract from zeroyou should get a negative... more

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Answers •1

Chemistry

03/26/20

Which of the statements accurately describes elements?

1.) They combine chemically to form new substances; they are "building blocks of matter".2.) They can be broken down by physical means.3.) They cannot be broken down by chemical means.4.) They are... more

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Chemistry

03/25/20

I can't solve this problem!

At a certain temperature, the Kp for the decomposition of H2S is 0.850.H2S(g)−⇀↽−H2(g)+S(g)Initially, only H2S is present at a pressure of 0.165 atm in a closed container. What is the total... more

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Chemistry

03/25/20

I cannot solve this problem!

Phosphorus pentachloride decomposes according to the chemical equationPCl5(g)−⇀↽−PCl3(g)+Cl2(g)Kc=1.80 at 250 ∘CA 0.2215 mol sample of PCl5(g) is injected into an empty 2.80 L reaction vessel held... more

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Chemistry Thermodynamics

03/25/20

Heat of solution

Hi!I will mix a salt with room-temperature water and 8 degree Celsius water. Then I will compare the heat of solution with each other. Does the temperature of the water from beginning affect how... more

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Chemistry

03/25/20

If 2 CH3OH + 3 O2 -> 2CO2 + 4 H2O was carried out in the laboratory and 219 g of water was produced, what would the percent yield be if the reaction started with 229 g of methanol in excess oxygen gas

If 2 CH3OH + 3 O2 -> 2CO2 + 4 H2O was carried out in the laboratory and 219 g of water was produced, what would the percent yield be if the reaction started with 229 g of methanol in excess... more

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Chemistry

03/25/20

help please- chem

Using electronegativity values on the Data Information Sheet, for each pair of bonds, indicate the more polar bond and use an arrow to show the direction of polarity. (i) C-O and C-N (ii) P-Br and... more

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Chemistry question about chemical equilibrium

Chemistry MATH question 3

Chemistry MATH question 2

Chemistry MATH Question 1

Find the mass of AlCl3 that is produced when 25.0g of Al2O3 react with HCl

5.00g of an unknown gas is collected at 20.0oC in a 1.00L container. It has a pressure of 2.733atm. What is the molar mass of the gas?

A mixture of O2 and N2 has a total pressure of 2.30 atm. The mixture contains 0.750 moles of N2 and has a volume of 30.0L at 25.0 oC. What is the partial pressure of the O2in atm?

if a 2.50L sample of air at 24.9 oC is heated until it's volume increases to 3.17, what is the new temperature in oC?

Problem B (SW) What Osmotic Pressure (Pi) can be generated by a 2M sugar solution at 16oC. (hint) use Pi = MRT change 16oC to K R = .08 L Atm/mol K Your answer is over 1 ATM..

Problem A (SW) What if the freezing point of a sugar solution that is 2m? kf = 1.86 (hint) get the change in freezing pt. using Atf = (kf)(m) then subtract from zero

Enthalpy of solution for copper sulfate

Give the name of the element with the electronic configuration 1 s 2 2 s 2 2 p 3 .

Identify the atom with the ground-state electron configuration shown for its valence shell. 4 s 2 3 d 10 4 p 6

Give the full electronic configuration for phosphorus.

Give the full electron configuration for nitrogen.

Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 5 to n = 1 .

Find the change in freeze, molality of solution, # of mols, molecular weight for the problem below

Potential Diagram

Problem A (SW) What is the freezing point of a sugar solution that is 2m? kf = 1.86

Which of the statements accurately describes elements?

I can't solve this problem!

I cannot solve this problem!

Heat of solution

If 2 CH3OH + 3 O2 -> 2CO2 + 4 H2O was carried out in the laboratory and 219 g of water was produced, what would the percent yield be if the reaction started with 229 g of methanol in excess oxygen gas

help please- chem

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