J.R. S.

12/04/19

Based on the thermodynamic properties provided for water, determine the energy change when the temperature of 1.35 kg of water decreased from 109 °C to 52.0 °C.

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12/04/19

The vaporization of 1 mole of liquid water (the system) at 100.9°C, 1.00 atm, is endothermic.

H2O(l)+40.7kJH2O(g)Assume that at exactly 100.0°C and 1.00 atm total pressure, 1.00 mole of liquid water and 1.00 mole of water vapor occupy 18.80 mL and 30.62 L, respectively.Calculate the work... more

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Chemistry

12/04/19

Determine the number of grams of sodium acetate dihydrate you would add to 500 ML of .250M acetic acid (pKa=4.750) to make a buffer of pH 5.00. Assume no change in volume.

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Chemistry

12/04/19

What is the [H3O+] in a solution with [OH-]=1x10^-12 M

I know the answer is kw=[H3O][OH] = 1 x 10^-14 / 1 x 10^-12 and 0.01 M but i dont understand HOW they got that answer

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Chemistry

12/04/19

A solution is made by dissolving 0.688 mol of nonelectrolyte solute in 807 g of benzene. Calculate the freezing point, T f , and boiling point, T b , of the solution.

Kf=5.12 C/mKb=2.53 C/m

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Chemistry

12/03/19

How many moles of aluminum metal are required to produce 4.04 L of hydrogen gas at 1.11 atm and 27 °C by reaction with HCl? 2 Al(s) + 6 HCl(aq) → 2 AlCl3 (aq) + 3 H2(g)

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Chemistry

12/03/19

Molecular equation and net ionic equation for hydrochloric acid and strontium hydroxide

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Chemistry Reactions

12/03/19

Titration Questions

What volume of each acid will react completely with 60.0 mL of 0.125 M Potassium Hydroxide?a.) .150 M Nitric Acidb.) .200 M Phosphoric Acid

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Chemistry

12/03/19

Consider a solution that contains both C6H5NH2 and C6H5NH3+. Calculate the ratio [C6H5NH2]/[C6H5NH3+] if the solution has the following pH values. (Assume that the solution is at 25°C.)

a- pH = 3.90b- pH = 4.47c-pH = 4.58d- pH = 4.93

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Chemistry

12/03/19

How many grams of water will the organism produce if it needs 6000.kJ to survive?

Balanced equation:4 FESO4 + 2 H2SO4 + O2 ----> 2 Fe2(SO4)3 + 2 H20 -929 -735 -2583 -286

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Chemistry

12/03/19

If the absorbance of a solution of copper(II) ion decreases by 26.00% upon dilution, what volume of water was added to 20.0 mL of a 1.20 M solution of Cu2+(aq)?

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Chemistry

12/03/19

For copper, with a heat of fusion of 209 J/g, what will be the energy (in joules) absorbed or released when 3.0 moles of liquid copper freezes into a solid.

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Chemistry

12/03/19

You have 72 g of the compound C2Hx, where x is the maximum number of hydrogens that can fit around two carbon atoms and still create a stable lewis dot structure.

If you allow all of this sample to react with excess oxygen, and then allow the products to cool to room temperature, how many moles of liquid product will you have?

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Chemistry

12/02/19

What is the osmotic pressure of a solution of 12.5g of sucrose in 225g water at 50 degrees C? Assume the density of the solution is 1g/ml.

I got 4.30 atm but its wrong where did i mess up 12.5g x 1 mol/342 g / 0.225 L = 0.162 R = 0.08206 Latm/KmolT = temperature in K = 50ºC + 273 = 323Kπ = (1)(0.162 mol/L)(0.0821 Latm/Kmol)(323K) =... more

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Chemistry

12/02/19

A 2.11 g sample of acetylsalicylic acid required 23.29 mL of 0.5028 M NaOH for complete reaction. Find the molar mass (in g/mol) of acetylsalicylic acid and its Ka value.

The active ingredient in aspirin is acetylsalicylic acid. A 2.11 g sample of acetylsalicylic acid required 23.29 mL of 0.5028 M NaOH for complete reaction. Addition of 13.08 mL of 0.4476 M HCl to... more

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Chemistry

12/02/19

A 25.0 mL sample of 0.124 M lactic acid (HC3H5O3, pKa = 3.86) is titrated with 0.124 M NaOH solution.

Lactic acid is a common by-product of cellular respiration and is often said to cause the "burn" associated with strenuous activity. A 25.0 mL sample of 0.124 M lactic acid (HC3H5O3, pKa = 3.86) is... more

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Chemistry

12/02/19

For 5.0 g of a substance initially at 30°C with a heat capacity of 0.40 J/g°C, what will be its final temperature if q=-35 J?

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Chemistry

12/01/19

Acids and Bases

The following acid-base reactions take place. Write the balanced molecular and net-ionic equations for each.a.) Cyanic Acid and Sodium Hydroxideb.) Hydrochloric Acid and Sodium Hydroxidec.) Nitrous... more

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Chemistry Chem Acids And Bases

12/01/19

Precipitation Possibilities

Determine if a a precipitate forms when the following 1.00M solutions are mixed. Provide the molecular equation, ionic equation and the net-ionic equation if one forms.a.) Barium Chloride and... more

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Chemistry

12/01/19

Ion Concentration Problems

Determine the concentration of each ion in .50 M solutions:a.) Magnesium Acetateb.) Barium Hydroxidec.) Iron (III) Nitrate

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Chemistry

12/01/19

Limiting Reagents

83.0 g of Al reacts with 67.0 g of O2 to produce Al2O3. How much Al2O3 is actually produced assuming 1000% yield?

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Chemistry

12/01/19

Consider the titration of 100.0 mL of 0.280 M benzoic acid (Ka = 6.4 ✕ 10−5) with 0.140 M NaOH. Calculate the pH of the resulting solution after each of the following volumes of NaOH has been added.

Consider the titration of 100.0 mL of 0.280 M benzoic acid (Ka = 6.4 ✕ 10−5) with 0.140 M NaOH. Calculate the pH of the resulting solution after each of the following volumes of NaOH has been... more

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Chemistry

12/01/19

What volumes of 0.55 M HF and 0.55 M LiF must be mixed to prepare 1.00 L of a solution buffered at pH = 3.55?

What volumes of 0.55 M HF and 0.55 M LiF must be mixed to prepare 1.00 L of a solution buffered at pH = 3.55?(a) HF ______ L(b) LiF ______ L

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Chemistry

12/01/19

What is the rate equation for this reaction?

2NO+I2=>2NOITRIAL 1initial concentration of NO(M)1.5initial concentration of I2(M)1.0instantaneous reaction rate (M/s)1.25TRIAL 2initial concentration of NO(M)1.5initial concentration of... more

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Chemistry

12/01/19

Is the HCl a catalyst for this reaction?

C2H4O+NaOH=>H2O+NaC2H3O

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Answers •1

Based on the thermodynamic properties provided for water, determine the energy change when the temperature of 1.35 kg of water decreased from 109 °C to 52.0 °C.

The vaporization of 1 mole of liquid water (the system) at 100.9°C, 1.00 atm, is endothermic.

Determine the number of grams of sodium acetate dihydrate you would add to 500 ML of .250M acetic acid (pKa=4.750) to make a buffer of pH 5.00. Assume no change in volume.

What is the [H3O+] in a solution with [OH-]=1x10^-12 M

A solution is made by dissolving 0.688 mol of nonelectrolyte solute in 807 g of benzene. Calculate the freezing point, T f , and boiling point, T b , of the solution.

How many moles of aluminum metal are required to produce 4.04 L of hydrogen gas at 1.11 atm and 27 °C by reaction with HCl? 2 Al(s) + 6 HCl(aq) → 2 AlCl3 (aq) + 3 H2(g)

Molecular equation and net ionic equation for hydrochloric acid and strontium hydroxide

Titration Questions

Consider a solution that contains both C6H5NH2 and C6H5NH3+. Calculate the ratio [C6H5NH2]/[C6H5NH3+] if the solution has the following pH values. (Assume that the solution is at 25°C.)

How many grams of water will the organism produce if it needs 6000.kJ to survive?

If the absorbance of a solution of copper(II) ion decreases by 26.00% upon dilution, what volume of water was added to 20.0 mL of a 1.20 M solution of Cu2+(aq)?

For copper, with a heat of fusion of 209 J/g, what will be the energy (in joules) absorbed or released when 3.0 moles of liquid copper freezes into a solid.

You have 72 g of the compound C2Hx, where x is the maximum number of hydrogens that can fit around two carbon atoms and still create a stable lewis dot structure.

What is the osmotic pressure of a solution of 12.5g of sucrose in 225g water at 50 degrees C? Assume the density of the solution is 1g/ml.

A 2.11 g sample of acetylsalicylic acid required 23.29 mL of 0.5028 M NaOH for complete reaction. Find the molar mass (in g/mol) of acetylsalicylic acid and its Ka value.

A 25.0 mL sample of 0.124 M lactic acid (HC3H5O3, pKa = 3.86) is titrated with 0.124 M NaOH solution.

For 5.0 g of a substance initially at 30°C with a heat capacity of 0.40 J/g°C, what will be its final temperature if q=-35 J?

Acids and Bases

Precipitation Possibilities

Ion Concentration Problems

Limiting Reagents

Consider the titration of 100.0 mL of 0.280 M benzoic acid (Ka = 6.4 ✕ 10−5) with 0.140 M NaOH. Calculate the pH of the resulting solution after each of the following volumes of NaOH has been added.

What volumes of 0.55 M HF and 0.55 M LiF must be mixed to prepare 1.00 L of a solution buffered at pH = 3.55?

What is the rate equation for this reaction?

Is the HCl a catalyst for this reaction?

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J.R. S.

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Emmersion

Based on the thermodynamic properties provided for water, determine the energy change when the temperature of 1.35 kg of water decreased from 109 °C to 52.0 °C.

The vaporization of 1 mole of liquid water (the system) at 100.9°C, 1.00 atm, is endothermic.

Determine the number of grams of sodium acetate dihydrate you would add to 500 ML of .250M acetic acid (pKa=4.750) to make a buffer of pH 5.00. Assume no change in volume.

What is the [H3O+] in a solution with [OH-]=1x10^-12 M

A solution is made by dissolving 0.688 mol of nonelectrolyte solute in 807 g of benzene. Calculate the freezing point, T f , and boiling point, T b , of the solution.

How many moles of aluminum metal are required to produce 4.04 L of hydrogen gas at 1.11 atm and 27 °C by reaction with HCl? ​ 2 Al(s) + 6 HCl(aq) → 2 AlCl3 (aq) + 3 H2(g)

Molecular equation and net ionic equation for hydrochloric acid and strontium hydroxide

Titration Questions

Consider a solution that contains both C6H5NH2 and C6H5NH3+. Calculate the ratio [C6H5NH2]/[C6H5NH3+] if the solution has the following pH values. (Assume that the solution is at 25°C.)

How many grams of water will the organism produce if it needs 6000.kJ to survive?

If the absorbance of a solution of copper(II) ion decreases by 26.00% upon dilution, what volume of water was added to 20.0 mL of a 1.20 M solution of Cu2+(aq)?

For copper, with a heat of fusion of 209 J/g, what will be the energy (in joules) absorbed or released when 3.0 moles of liquid copper freezes into a solid.

You have 72 g of the compound C2Hx, where x is the maximum number of hydrogens that can fit around two carbon atoms and still create a stable lewis dot structure.

What is the osmotic pressure of a solution of 12.5g of sucrose in 225g water at 50 degrees C? Assume the density of the solution is 1g/ml.

A 2.11 g sample of acetylsalicylic acid required 23.29 mL of 0.5028 M NaOH for complete reaction. Find the molar mass (in g/mol) of acetylsalicylic acid and its Ka value.

A 25.0 mL sample of 0.124 M lactic acid (HC3H5O3, pKa = 3.86) is titrated with 0.124 M NaOH solution.

For 5.0 g of a substance initially at 30°C with a heat capacity of 0.40 J/g°C, what will be its final temperature if q=-35 J?

Acids and Bases

Precipitation Possibilities

Ion Concentration Problems

Limiting Reagents

Consider the titration of 100.0 mL of 0.280 M benzoic acid (Ka = 6.4 ✕ 10−5) with 0.140 M NaOH. Calculate the pH of the resulting solution after each of the following volumes of NaOH has been added.

What volumes of 0.55 M HF and 0.55 M LiF must be mixed to prepare 1.00 L of a solution buffered at pH = 3.55?

What is the rate equation for this reaction?

Is the HCl a catalyst for this reaction?

Still looking for help? Get the right answer, fast.

OR

J.R. S.

How many moles of aluminum metal are required to produce 4.04 L of hydrogen gas at 1.11 atm and 27 °C by reaction with HCl? 2 Al(s) + 6 HCl(aq) → 2 AlCl3 (aq) + 3 H2(g)