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Chemistry

11/14/23

At constant pressure, which of these systems do work on the surroundings? Check all that apply. a. 2A(g)+3B(g) --> 4C(g) b. A(s)+B(g) --> 2C(g) c. A(g)+B(g) --> 3C(g) d. A(s)+2B(g) --> C(g)

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Chemistry

11/14/23

question is below in the description

In a constant-pressure calorimeter, 55.0 mL of 0.310 M Ba(OH)2 was added to 55.0 mL of 0.620 M HCl. The reaction caused the temperature of the solution to rise from 24.15 °C to 28.37 °C. If the... more

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Chemistry

11/14/23

question below in the description

The balanced combustion reaction for C6H6 is 2C6H6(l)+15O2(g)⟶12CO2(g)+6H2O(l)+6542 kJ If 8.600 g C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 ∘ C, what... more

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Chemistry

11/14/23

question is below in the description

Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 1.80 MJ of energy (in the form of heat) if the temperature of the sodium is... more

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Chemistry

11/14/23

If you combine 270.0 mL of water at 25.00 °C and 100.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

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Chemistry

11/14/23

An 80.0-gram sample of gas was heated from 25C to 225C. During the process, 346 J of work was done by the system and its internal energy increased by 8875. What is the specific heat of the gas?

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Chemistry

11/14/23

The gas in a 275.0 mL piston experiences a change in pressure from 1.00 atm to 4.85 atm. What is the new volume (in mL) assuming the moles of gas and temperature are held constant?

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Chemistry

11/14/23

Calculate the molar solubility (to 4 decimal places) of AgBr in 2.4 M NH3 (Kf for Ag(NH3)2+1 is 1.7x107 and Ksp for AgBr is 5.0 x 10-13).

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Chemistry

11/14/23

At 460 K, ∆G = -13.5 kJ/mol for the reaction 2 A (g) → B (g). If the partial pressures of A and B are 7.20 atm and 0.420 atm respectively, what is ∆G° for this reaction?

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Chemistry

11/14/23

Determine K for a reaction at 200 K if ∆G° =29.6 kJ/mol. (R = 8.314 J/mol ･ K)

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Chemistry

11/13/23

Chemistry......

A 157.6 g piece of metal is placed into a beaker of boiling water. You record the temperature of boiling water to be 97.1 . The metal is then placed into a coffee cup calorimeter that contains... more

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Chemistry

11/12/23

chemistry homework questions

You mix 200 mL of 0.3 M NH₃ (pKb = 4.75) with 300 mL of 0.3 M NH₄Cl to make 500 mL of buffer solution. If you then wanted to adjust the pH to be 8.7, how many moles of solid HBr should you add?... more

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Chemistry

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

Chemistry- Calorimetry

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

Chemistry- Calorimetry

How much heat (in joules) is used to heat a 25.68 gram sample of iron from 1.18 degrees Celcius to 100.00 degrees Celcius if the specific heat of Fe is 0.450 J/g°C?I use this formula q = mc(TF-TI)... 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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At constant pressure, which of these systems do work on the surroundings? Check all that apply. a. 2A(g)+3B(g) --> 4C(g) b. A(s)+B(g) --> 2C(g) c. A(g)+B(g) --> 3C(g) d. A(s)+2B(g) --> C(g)

question is below in the description

question below in the description

question is below in the description

If you combine 270.0 mL of water at 25.00 °C and 100.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

An 80.0-gram sample of gas was heated from 25*C to 225*C. During the process, 346 J of work was done by the system and its internal energy increased by 8875. What is the specific heat of the gas?

The gas in a 275.0 mL piston experiences a change in pressure from 1.00 atm to 4.85 atm. What is the new volume (in mL) assuming the moles of gas and temperature are held constant?

Calculate the molar solubility (to 4 decimal places) of AgBr in 2.4 M NH3 (Kf for Ag(NH3)2+1 is 1.7x107 and Ksp for AgBr is 5.0 x 10-13).

At 460 K, ∆G = -13.5 kJ/mol for the reaction 2 A (g) → B (g). If the partial pressures of A and B are 7.20 atm and 0.420 atm respectively, what is ∆G° for this reaction?

Determine K for a reaction at 200 K if ∆G° =29.6 kJ/mol. (R = 8.314 J/mol ･ K)

Chemistry......

chemistry homework questions

chemistry question

Chemistry questions

Chemistry- Calorimetry

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.

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An 80.0-gram sample of gas was heated from 25C to 225C. During the process, 346 J of work was done by the system and its internal energy increased by 8875. What is the specific heat of the gas?