J.R. S.

Chemistry

04/01/22

What is the percent ionization of H₂NNH₂ in a solution with a concentration of a 0.430 M? (Kb = 1.3 × 10⁻⁶)

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Chemistry

04/01/22

4Fe(s)+3O2(g) →2Fe2O3(s) If 74.9 g of Fe and 67.8 g of O2 are mixed, and 85.0 g of Fe2O3 is actually obtained, what is the percent yield of Fe2O3 for the reaction?

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Chemistry

03/31/22

Chemistry absorptivity

A 100.0 mM solution particular colored solution has an absorbance of 0.342 at a wavelength of 545 nm when measured in a 2.00 cm cuvet. Calculate the molar absorptivity of the absorbing compound.

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Chemistry Mole Mole factor

03/31/22

Identify the correct mole-mole factor needed to find moles of O2 that needed to react with moles of P for the chemical equation, 4P(s)+5O2(g)→2P2O5(s) .

a. 1/2 moles of 02 per mole of Pb. 3/4 moles of 02 per mole of Pc. 5/4 moles of 02 per mole of Pd. 1 moles of 02 per mole of P

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Chemistry

03/31/22

A certain indicator, HA, has a 𝐾a value of 4.0×10−8. The protonated form of the indicator is red and the ionized form is blue. What is the p𝐾a of the indicator?

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Chemistry

03/31/22

Zinc reacts with hydrochloric acid according to the reaction equation Zn(s)+2HCl(aq)⟶ZnCl2(aq)+H2(g) How many milliliters of 6.00 M HCl(aq) are required to react with 7.85 g Zn(s)?

My answer was 15.3, Im not sure what I did wrong.

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Chemistry

03/31/22

Calculate the mass percent of 3.57 g KCl dissolved in 41.1 g H2O.

I get the answer 8.7 but the assignment says I am wrong, Could someone please explain what I am doing wrong?

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Chemistry

03/31/22

If 8.62 g of CuNO3 is dissolved in water to make a 0.500 M solution, what is the volume of the solution in milliliters?

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Chemistry Chemistry Equilibrium Chemistry Solubility

03/31/22

Chemistry solubility problem

This reaction represents the dissolution and precipitation of Ag2CO3(s). Ag2CO3(s) ⇄ 2 Ag+(aq) + CO3^(2-)(aq), K = 4.5 ×10^(-12)If we were to mix 0.00025 mol of solid Ag2CO3 in 5.00 L of pure... more

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Chemistry

03/31/22

Use Hess’s law to determine the Delta H for the combustion of liquid methanol

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Chemistry Stoichiometry

03/30/22

NaHCO3 + HC2H3O2 --> NaC2H3O2 + H2O + CO2 If you have exactly 12.2g of baking soda, how much vinegar would you need to add to react all of the baking soda?

NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O +_CO2 If you have exactly 12.2g of baking soda, how much vinegar would you need to add to react all of the baking soda?

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Chemistry Dilution

03/30/22

An aqueous solution of an unknown acid of the formula HX has a mass percentage composition of 2.56% and a mass density of 1.10 g/ml. 10 ml of this solution is taken and water is added until a total... more

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Chemistry

03/30/22

Calculate the boiling point of water?

Calculate the boiling point of a water solution at each concentration.Part A0.188 mBoling point= ? CPart B1.79 mBoling point= ? CPart C3.78mBoling point= ? CPart D2.16 mBoling point= ? C

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Chemistry

03/30/22

How many milliliters of 0.612M hydrochloric acid (HCl(aq)) must be added to 15.00mL of 0.557M sodium hydroxide (NaOH(aq)) to reach the equivalence point? Report your answer to 2 decimal places.

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Chemistry Electrochemistry

03/30/22

Electrochemistry

Cell Diagram 1. Calculate the e.m.f of the following cells under standard conditions and show cell diagram a. Ni2+ /Ni and Sn4+/ Sn2+ b. I - /I2 and Ag+ / Ag 2.An electrochemical cell is... more

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Chemistry

03/30/22

how many grams of silver chromate are produced from 33.9 g of silver nitrate?

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Chemistry Tritration

03/30/22

Titration in Chemistry

A chemist needs to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. She has a 0.1323 M standard sodium hydroxide solution. She takes a... more

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Chemistry General Chemistry

03/29/22

25.00mL of a sulfuric acid solution of unknown molarity is titrated to the second equivalence point with 20.95mL of 0.243M potassium hydroxide solution

25.00mL of a sulfuric acid solution of unknown molarity is titrated to the second equivalence point with 20.95mL of 0.243M potassium hydroxide solution. What is the concentration of the sulfuric... more

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Chemistry

03/29/22

chemistry 102 college

You wish to prepare 203 grams of 12.3 % Co(NO3)2. You will need grams of cobalt(II) nitrate and mL of water.Assume that the density of water is 1.00 g / ml.

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Chemistry

03/29/22

How many milligrams of Fe are there in 6.025 g of a leaf tissue that is 0.0025% iron by mass? (Note: 0.0025% by mass = 0.0025 g Fe per 100 g sample.)

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Chemistry

03/29/22

concentration of the potassium dichromate solution

25.0 mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for complete reaction. What is the concentration of the potassium... more

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Science Chemistry Biochemistry

03/29/22

If a 0.3911 gram sample of 95% sodium bicarbonate is titrated with 0.9387 N sulfuric acid, what volume of the acid is needed to produce an endpoint?

The answer should be rounded in 2 decimal places and for consistency of the atomic weights, round up to 1 decimal place. Example: Chlorine is 35.5 and Oxygen is 16. Sulfur is 32.1. etc.

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Chemistry

03/29/22

Assign oxidation states to the species in the unbalanced redox reaction. Ag+(aq)+Cu(s)⟶Ag(s)+Cu2+(aq)

Ag+(aq):Ag(s):Cu(s):Cu2+(aq):Which substance gets oxidized?Which substance gets reduced?Balance the redox reaction.

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Chemistry

03/29/22

Calculate the cell potential for the reaction as written at 25.00 °C , given that [Zn2+]=0.805 M and [Fe2+]=0.0180 M . Use the standard reduction potentials in this table.

Zn(s)+Fe2+(aq)↽−−⇀ Zn2+(aq)+Fe(s)

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Chemistry

03/29/22

A volume of 500.0 mL of 0.110 M NaOH is added to 545 mL of 0.200 M weak acid (𝐾a=8.45×10−5). What is the pH of the resulting buffer? HA(aq)+OH−(aq)⟶H2O(l)+A−(aq) pH=

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Answers •1

What is the percent ionization of H₂NNH₂ in a solution with a concentration of a 0.430 M? (Kb = 1.3 × 10⁻⁶)

4Fe(s)+3O2(g) →2Fe2O3(s) If 74.9 g of Fe and 67.8 g of O2 are mixed, and 85.0 g of Fe2O3 is actually obtained, what is the percent yield of Fe2O3 for the reaction?

Chemistry absorptivity

Identify the correct mole-mole factor needed to find moles of O2 that needed to react with moles of P for the chemical equation, 4P(s)+5O2(g)→2P2O5(s) .

A certain indicator, HA, has a 𝐾a value of 4.0×10−8. The protonated form of the indicator is red and the ionized form is blue. What is the p𝐾a of the indicator?

Zinc reacts with hydrochloric acid according to the reaction equation Zn(s)+2HCl(aq)⟶ZnCl2(aq)+H2(g) How many milliliters of 6.00 M HCl(aq) are required to react with 7.85 g Zn(s)?

Calculate the mass percent of 3.57 g KCl dissolved in 41.1 g H2O.

If 8.62 g of CuNO3 is dissolved in water to make a 0.500 M solution, what is the volume of the solution in milliliters?

Chemistry solubility problem

Use Hess’s law to determine the Delta H for the combustion of liquid methanol

NaHCO3 + HC2H3O2 --> NaC2H3O2 + H2O + CO2 If you have exactly 12.2g of baking soda, how much vinegar would you need to add to react all of the baking soda?

dilution problem ; chemistry

Calculate the boiling point of water?

How many milliliters of 0.612M hydrochloric acid (HCl(aq)) must be added to 15.00mL of 0.557M sodium hydroxide (NaOH(aq)) to reach the equivalence point? Report your answer to 2 decimal places.

Electrochemistry

how many grams of silver chromate are produced from 33.9 g of silver nitrate?

Titration in Chemistry

25.00mL of a sulfuric acid solution of unknown molarity is titrated to the second equivalence point with 20.95mL of 0.243M potassium hydroxide solution

chemistry 102 college

How many milligrams of Fe are there in 6.025 g of a leaf tissue that is 0.0025% iron by mass? (Note: 0.0025% by mass = 0.0025 g Fe per 100 g sample.)

concentration of the potassium dichromate solution

If a 0.3911 gram sample of 95% sodium bicarbonate is titrated with 0.9387 N sulfuric acid, what volume of the acid is needed to produce an endpoint?

Assign oxidation states to the species in the unbalanced redox reaction. Ag+(aq)+Cu(s)⟶Ag(s)+Cu2+(aq)

Calculate the cell potential for the reaction as written at 25.00 °C , given that [Zn2+]=0.805 M and [Fe2+]=0.0180 M . Use the standard reduction potentials in this table.

A volume of 500.0 mL of 0.110 M NaOH is added to 545 mL of 0.200 M weak acid (𝐾a=8.45×10−5). What is the pH of the resulting buffer? HA(aq)+OH−(aq)⟶H2O(l)+A−(aq) pH=

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