Newest organic chemistry Questions | Wyzant Ask An Expert

05/13/21

please help me with chemistry and heat

Calculate the amount of heat needed to melt 2.0 kg of iron at its melting point (1809 K) given that: ΔHfus = 13.80 kJ/mol.A. 27,600 kJB. 25,000kJ C. 494 kJD. 27.6 kJ

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Organic Chemistry Chemistry

05/13/21

The 𝐾a of a monoprotic weak acid is 0.00304. What is the percent ionization of a 0.154 M solution of this acid?

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Organic Chemistry Chemistry

05/13/21

At 25 °C, only 0.0360 mol of the generic salt AB3 is soluble in 1.00 L of water. What is the 𝐾sp of the salt at 25 °C?

AB3(s)↽−−⇀A3+(aq)+3B−(aq)

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Organic Chemistry Chemistry

05/13/21

What concentration of SO2−3 is in equilibrium with Ag2SO3(s) and 7.90×10−3 M Ag+ ?

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Organic Chemistry Chemistry

05/13/21

Calculate the cell potential for the reaction as written at 25.00 °C , given that [Cr2+]=0.860 M and [Sn2+]=0.0120 M . Use the standard reduction potentials in this table.

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Organic Chemistry Chemistry

05/13/21

A current of 3.98 A is passed through a Pb(NO3)2 solution. How long, in hours, would this current have to be applied to plate out 4.70 g of lead?

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Organic Chemistry Chemistry

05/13/21

Purification of nickel can be achieved by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an electrolytic cell.

How many hours will it take to plate 15.0 kg of nickel onto the cathode if the current passed through the cell is held constant at 31.5 A ? Assume the nickel in the electrolytic solution is... more

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Organic Chemistry Chemistry

05/13/21

A certain reaction has an enthalpy of Δ𝐻=−34 kJ and an activation energy of 𝐸a=53 kJ. What is the activation energy of the reverse reaction?

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Organic Chemistry Chemistry Biochemistry Chemical Engineering

05/12/21

ASAP: Please show all work : Use the data in the table below to calculate the value of the standard molar entropy S°, for B2 (g) at 25°C.

(c) Use the data in the table below to calculate the value of the standard molar entropy S°, for B2 (g) at 25°C. Please show all workSubstance: Standard Molar Entropy, S° (J/Kmol)AB(g) 217.9AB2(g)... more

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Organic Chemistry Chemistry Biochemistry Chem

05/12/21

Which of the following can be determined about ∆So for the reaction?

A student conducts a reaction at 298 K in a rigid vessel and the reaction goes to completion. The temperature of the reaction vessel drops during the reaction. Which of the following can be... more

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Organic Chemistry Chemistry Biochemistry Chem

05/12/21

PLEASE HELP *Which of the following pairs of conditions are needed to construct a similar cell that generates the highest cell potential?

Fe2+(aq)+Zn(s)→Fe(s)+Zn2+(aq)E°cell=+0.32VA galvanic cell generates a cell potential of +0.32V when operated under standard conditions according to the reaction above. Which of the following pairs... more

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Organic Chemistry Chemistry Biochemistry Chemical Engineering

05/12/21

*Which of the following pairs of conditions are needed to construct a similar cell that generates the highest cell potential?

Fe2+(aq)+Zn(s)→Fe(s)+Zn2+(aq)E°cell=+0.32VA galvanic cell generates a cell potential of +0.32V when operated under standard conditions according to the reaction above. Which of the following pairs... more

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Organic Chemistry Biology Chemistry Biochemistry

05/11/21

STOICHIOMETRY - what is the PERCENTAGE YIELD OF ASPIRIN?

Density of Acetic Acid = 1.082 g/mlMass of Salicylic Acid = 5.102 gVolume of Acetic anhydride = 10.00 mlMass of filter paper = 0.0654 gMass of watch glass = 8.677 gMass of filter paper, watchglass... more

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Organic Chemistry Biology Chemistry Biochemistry

05/11/21

What is the percentage yield of aspirin? (STOICHIOMETRY)

Density of Acetic Acid = 1.082 g/mlMass of Salicylic Acid = 5.102 gVolume of Acetic anhydride = 10.00 mlMass of filter paper = 0.0654 g Mass of watch glass = 8.677 gMass of filter paper,... more

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Organic Chemistry Chemistry Chem

05/10/21

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which of the following gives the relative size of Ka and pH of a 0.10 M solution of HEX3(aq)?HEX3(aq) + H2O(l) ⇌ H3O+(aq) + EX3−(aq)∆Go = +47 kJ/molrxnThe reaction between the acid HEX3(aq) and... more

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Organic Chemistry Chemistry

05/10/21

2C2H2 + 5O2 -> 4CO2 + 2H2O Identify theoretical yields in grams if 100.0 g of each reactant was used.

2C2H2 + 5O2 -> 4CO2 + 2H2OIdentify theoretical yields in grams if 100.0 g of each reactant was used.

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Organic Chemistry Chemistry

05/10/21

1 C2H5OH + 3 O2 -> 2 CO2 + 3 H20 Identify theoretical yields in moles if 1.00 mol of each reactant was used.

1 C2H5OH + 3 O2 -> 2 CO2 + 3 H20Identify theoretical yields in moles if 1.00 mol of each reactant was used.

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Organic Chemistry Chemistry Biochemistry Ap Chemistry

05/09/21

Help with chemistry questions plz

1-Calculate the mass in grams, in 2.28 mol of H2SO4.2-Calculate the number of moles in 144 g of P.3-Calculate the number of moles in 11.0 grams of NaOH4-Calculate the moles of Iron (Fe) in 3.8 x... more

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Organic Chemistry Chemistry Chem

05/07/21

which of the following gives the relative size of Ka and pH of a 0.10 M solution of HEX3(aq)?

HEX3(aq) + H2O(l) ⇌ H3O+(aq) + EX3−(aq)∆Go = +47 kJ/molrxnThe reaction between the acid HEX3(aq) and water is shown above. Based on the chemical equation and the value of ∆Go given above, which of... more

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Organic Chemistry Chemistry Chem

05/07/21

Based on the value of ∆Go and the chemical reaction, which of the following is true about the reaction?

2 EMZ3(g) ⇌ 2 EZ3(g) + M2(g)∆Gorxn = −350 kJ/molrxnA small sample of EMZ3 is placed into an evacuated, rigid metal container and allowed to reach equilibrium. Based on the value of ∆Go and the... more

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Organic Chemistry Science Chemistry

05/07/21

Chemistry question help

A buffer can be made by dissolvingboth hydrofluoric acid, HF, and sodium fluoride, NaFsodium fluoride, NaFhydrofluoric acid, HF

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Organic Chemistry Science Chemistry

05/07/21

Chemistry problem

Which molecule will experience hydrogen bonding with other molecules like it?PH4SO2NH3

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Organic Chemistry Science Chemistry

05/07/21

chemistry question

Which cation is a weak acid?Na+Ba2+Mn4+

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Organic Chemistry Science Chemistry

05/07/21

Chemistry problem

A voltaic cell will generate voltage ifthe half-reactions and concentrations in each half-cell are identicalthe redox reaction has a negative ΔG°the half-reaction with the more negative E° is the... more

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Organic Chemistry Science Chemistry

05/07/21

Chemistry question help

Which pair of compounds will form a buffer?HNO2 and LiNO2HCl and NaClH2SO3 and MgBr2

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please help me with chemistry and heat

The 𝐾a of a monoprotic weak acid is 0.00304. What is the percent ionization of a 0.154 M solution of this acid?

At 25 °C, only 0.0360 mol of the generic salt AB3 is soluble in 1.00 L of water. What is the 𝐾sp of the salt at 25 °C?

What concentration of SO2−3 is in equilibrium with Ag2SO3(s) and 7.90×10−3 M Ag+ ?

Calculate the cell potential for the reaction as written at 25.00 °C , given that [Cr2+]=0.860 M and [Sn2+]=0.0120 M . Use the standard reduction potentials in this table.

A current of 3.98 A is passed through a Pb(NO3)2 solution. How long, in hours, would this current have to be applied to plate out 4.70 g of lead?

Purification of nickel can be achieved by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an electrolytic cell.

A certain reaction has an enthalpy of Δ𝐻=−34 kJ and an activation energy of 𝐸a=53 kJ. What is the activation energy of the reverse reaction?

ASAP: Please show all work : Use the data in the table below to calculate the value of the standard molar entropy S°, for B2 (g) at 25°C.

Which of the following can be determined about ∆So for the reaction?

PLEASE HELP *Which of the following pairs of conditions are needed to construct a similar cell that generates the highest cell potential?

*Which of the following pairs of conditions are needed to construct a similar cell that generates the highest cell potential?

STOICHIOMETRY - what is the PERCENTAGE YIELD OF ASPIRIN?

What is the percentage yield of aspirin? (STOICHIOMETRY)

list answer clearly

2C2H2 + 5O2 -> 4CO2 + 2H2O Identify theoretical yields in grams if 100.0 g of each reactant was used.

1 C2H5OH + 3 O2 -> 2 CO2 + 3 H20 Identify theoretical yields in moles if 1.00 mol of each reactant was used.

Help with chemistry questions plz

which of the following gives the relative size of Ka and pH of a 0.10 M solution of HEX3(aq)?

Based on the value of ∆Go and the chemical reaction, which of the following is true about the reaction?

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