J.R. S.

11/12/23

chemistry question

You are titrating a 700 mL sample of 0.15 M CCl₃COOH (pKa = 0.66) with 0.2 M NaOH. What will the pH be at the equivalence point?

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Chemistry

11/12/23

Chemistry questions

At what pH will Fe(OH)₃(s) begin to precipitate from 5.15 × 10⁻³ M FeCl₃? Ksp for Fe(OH)₃ is 2.79 × 10⁻³⁹.

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Chemistry

11/12/23

A sample of gas is placed into an enclosed cylinder and fitted with a movable piston. Calculate the work (in joules) done on the gas if it is compressed from 11.32 L to 1.16 L with a pressure of... more

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Chemistry

11/12/23

How many moles of NaN3 must be extracted from 65 grams of N2?

2 moles of Sodium Azide (NaN3) produces about 3 moles of Nitrogen (N2) in a car's airbag.How many moles of NaN3 are needed to fill a 65 gram airbag? Assume the gas is produced at a temperature of... more

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Chemistry

11/12/23

Chemistry- Enthalpy

The combustion of hexane is given by the following reaction.2 C6H14 + 19 O2 12 CO2 + 14 H2OThe enthalpy of reaction is −4163.0 kJ/mol. How much energy (in joules) will be released if 58.53 grams... more

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Chemistry

11/12/23

Chem: Calorimetry

A 25.00 gram sample of an unknown metal initially at 99.0 degrees Celcius is added to 50.00 grams of water initially at 6.00 degrees Celcius. The final temperature of the system is 20.15 degrees... more

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Chemistry

11/12/23

Enthalpy- Chemistry

Calculate ΔHo for the process ½ N2(g) + ½ O2(g) → NO(g)from the following information N2(g) + 2 O2(g) → 2 NO2(g) ΔHo = -129.7 kJ/mol 2 NO(g) + O2 → 2 NO2(g) ΔHo = -417.1 kJ/mol

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Chemistry

11/11/23

Write the balanced half-cell reactions that take place at the cathode and at the anode.

Consider a galvanic cell in which Al3+ is reduced to elemental aluminum and magnesium metal is oxidized to Mg2+ . Write the balanced half-cell reactions that take place at the cathode and at the... more

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Chemistry

11/11/23

Write the balanced half reaction that occurs at the anode in a hydrogen-oxygen fuel cell in which an acidic electrolyte is used.

Write the balanced half reaction that occurs at the anode in a hydrogen-oxygen fuel cell in which an acidic electrolyte is used.anode half-reaction: ?

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Chemistry

11/11/23

Balance the redox reaction by inserting the appropriate coefficients

Balance the redox reaction by inserting the appropriate coefficientsredox reaction:Fe3+ +NO2- +H2O---->Fe2+ +H+ + NO3-

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Chemistry

11/11/23

Balance the redox reaction by inserting the appropriate coefficients

Balance the redox reaction by inserting the appropriate coefficients redox reaction: H2O+Se_Cd2+--->Cd+SeO32-+H+

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Chemistry

11/11/23

Calculate the pH of the buffer after the addition of 1.079 mL of 11.508 M HCl to 1.00 L of the buffer.

Rank the following bases in order of increasing equivalence point pH if titrated with HCl.Calculate the pH of a buffer containing 0.182 M HNO2 and 0.170 M NaNO2 at 25°C. The pKa value for HNO2 is... more

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Chemistry

11/11/23

Rank the following acids in order of increasing equivalence point pH if titrated with NaOH.

For the following scenarios, consider that you have equal volumes and concentrations of the acids in Part 1, and that you have equal volumes and concentrations of the bases in Part 2.A. Rank the... more

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Chemistry

11/11/23

Calorimetry - Chemistry

Calculate the final temperature of the system: A 50.0 gram sample of water initially at 100 °C and a 100 gram sample initially at 24.6 °C are mixed. The specific heat of water is 4.184 J/g°C. °C

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Chemistry

11/11/23

Write the net ionic equation for the reaction of copper metal with aqueous silver nitrate. Include physical states.

Write the net ionic equation for the reaction of copper metal with aqueous silver nitrate. Include physical states.Molecular equation:?

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Chemistry

11/11/23

Write molecular equations to describe the following oxidation-reduction reactions. Include phase symbols, and identify the species that is oxidized and reduced in each reaction.

Write molecular equations to describe the following oxidation-reduction reactions. Include phase symbols, and identify the species that is oxidized and reduced in each reaction. Solid iron metal... more

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Chemistry

11/11/23

Write two half-reactions to describe each of these metal displacement reactions. Include phase symbols.

Write two half-reactions to describe each of these metal displacement reactions. Include phase symbols.Cu(s)+2 AuCl(aq)--->CuCl2 (aq)+2 Au(s)oxidation half-reaction?reduction half-reaction:?

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Chemistry

11/11/23

Calculate the pH of a solution that is 0.232 M acetic acid and 0.183 M sodium acetate. The Ka of acetic acid is 1.76×10–5 at 25°C. What is the pH of this mixture at 0°C? (At 0°C, Ka = 1.64x10-5)

A. pH at 25°C = B. pH at 0°C = 2 decimal places

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Chemistry

11/11/23

What volume of 0.011 M HCl is required to titrate a solution containing 257 mL of 0.011 M Na2CO3 and 257 mL of 0.011 M HCO3- ?

The common-ion effect plays a key role in controlling the pH of solutions that contain both a weak acid and its conjugate base.

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Chemistry

11/11/23

What is the pH of a solution that results from mixing together equal volumes of a 0.070 M solution of ammonia and a 0.035 M solution of hydrochloric acid? (pKa of NH4+ = 9.25)

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Chemistry

11/11/23

Calculate the pH at 25°C of 200.0 mL of a buffer solution that is 0.460 M NH4Cl and 0.460 M NH3 before and after the addition of 2.70 mL of 6.0 M HNO3. (The pKa for NH4+ = 9.75)

A. pH before =B. pH after =

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Chemistry

11/11/23

Calculate the pH of a buffer containing 0.182 M HNO2 and 0.170 M NaNO2 at 25°C. The pKa value for HNO2 is 3.40.

An acid–base buffer is a solution that resists changes in pH when a small amount of strong acid or base is added. Acid–base buffers typically contain a weak acid and its conjugate base.

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Chemistry

11/11/23

What is the pH at the equivalence point when 25.0 mL of a 0.275 M solution of acetic acid (CH3COOH) is titrated with 0.100 M NaOH to its end point?

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Chemistry Organic Chemistry

11/11/23

2,2-dimethylhexane has a heat of formation of -186.9kJ/mol.

2,2-dimethylhexane has a heat of formation of -186.9kJ/mol. Assuming an isolated system that uses this substance as a fuel, what mass of the substance would be required to heat 335g of water from... more

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Chemistry

11/10/23

The Ksp of strontium carbonate, SrCO3, is 5.60 x 10-10. Calculate the molar solubility, S, of this compound. S=? M

The Ksp of strontium carbonate, SrCO3, is 5.60 x 10-10. Calculate the molar solubility, S, of this compound.S=? M

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chemistry question

Chemistry questions

Chemistry- Calorimetry

How many moles of NaN3 must be extracted from 65 grams of N2?

Chemistry- Enthalpy

Chem: Calorimetry

Enthalpy- Chemistry

Write the balanced half-cell reactions that take place at the cathode and at the anode.

Write the balanced half reaction that occurs at the anode in a hydrogen-oxygen fuel cell in which an acidic electrolyte is used.

Balance the redox reaction by inserting the appropriate coefficients

Balance the redox reaction by inserting the appropriate coefficients

Calculate the pH of the buffer after the addition of 1.079 mL of 11.508 M HCl to 1.00 L of the buffer.

Rank the following acids in order of increasing equivalence point pH if titrated with NaOH.

Calorimetry - Chemistry

Write the net ionic equation for the reaction of copper metal with aqueous silver nitrate. Include physical states.

Write molecular equations to describe the following oxidation-reduction reactions. Include phase symbols, and identify the species that is oxidized and reduced in each reaction.

Write two half-reactions to describe each of these metal displacement reactions. Include phase symbols.

Calculate the pH of a solution that is 0.232 M acetic acid and 0.183 M sodium acetate. The Ka of acetic acid is 1.76×10–5 at 25°C. What is the pH of this mixture at 0°C? (At 0°C, Ka = 1.64x10-5)

What volume of 0.011 M HCl is required to titrate a solution containing 257 mL of 0.011 M Na2CO3 and 257 mL of 0.011 M HCO3- ?

What is the pH of a solution that results from mixing together equal volumes of a 0.070 M solution of ammonia and a 0.035 M solution of hydrochloric acid? (pKa of NH4+ = 9.25)

Calculate the pH at 25°C of 200.0 mL of a buffer solution that is 0.460 M NH4Cl and 0.460 M NH3 before and after the addition of 2.70 mL of 6.0 M HNO3. (The pKa for NH4+ = 9.75)

Calculate the pH of a buffer containing 0.182 M HNO2 and 0.170 M NaNO2 at 25°C. The pKa value for HNO2 is 3.40.

What is the pH at the equivalence point when 25.0 mL of a 0.275 M solution of acetic acid (CH3COOH) is titrated with 0.100 M NaOH to its end point?

2,2-dimethylhexane has a heat of formation of -186.9kJ/mol.

The Ksp of strontium carbonate, SrCO3, is 5.60 x 10-10. Calculate the molar solubility, S, of this compound. S=? M

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