J.R. S.

07/27/22

Please help me on this question below!

A 1.025 g sample of an unknown alkaline earth metal bromide salt is dissolved in enough water to make a 25.00 mL solution. The osmotic pressure is found to be 12.16 atm at 25.0 degrees C. What is... more

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Chemistry

07/27/22

At 25°C, an acid has a pKa value of 5,73; this corresponds to a standard ΔGsys value (in kcalmol-1) of...?

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Chemistry Organic Chemistry Chemical Engineering

07/27/22

The mass of KCl solid(AR grade) to prepare a 1000 ppm K solution in a 500 mL volumetric flask

The mass of KCl solid (AR grade) to prepare a 1000ppm K solution in a 500mL volumetric flask

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Chemistry

07/26/22

Partial Pressure Help

A mixture of He, Ar, and Xe has a total pressure of 8.072 atm . The partial pressure of He is 0.704 atm , and the partial pressure of Ar is 0.743 atm . What is the partial pressure of Xe? Report... more

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Chemistry

07/26/22

Gas Homework Help

How many kilograms of methane gas, CH4, are in a 6.7 × 105 L storage tank at STP? Report your answer rounded to the nearest kilogram, no decimals, and without units.

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Chemistry

07/26/22

Gas Homework Help

How many moles of gas are present in a 48.58 liter sample at STP? Give the number of moles rounded to the hundredths place without units.

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Chemistry

07/26/22

Potassium permanganate, KMnO4, is both effective at treating water and has medical uses.

Potassium permanganate, KMnO4, is both effective at treating water and has medical uses. A certain solution of KMnO4 being prepared to treat water has a concentration of 11.79% (m/v). Calculate the... more

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Chemistry

07/26/22

excess sodium phosphate is mixed with 778.6 ml of strontium chloride at a concentration of 0.309 mol/l. if the reactions has a 67.50% yield, what is the mass of dry precipitate actually collected.

PLEASE HELP I BEG UUU

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Chemistry

07/25/22

What is the average rate of this reaction?

You are studying the decomposition of sulfur dioxide gas. You start the reaction by putting 52.710g of sulfur dioxide gas in a 6.70L vessel. After 4.96 minutes, there is 19.453g of sulfur dioxide... more

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Chemistry

07/25/22

How many coulombs of charge are necessary to produce 395 g of Al from Al³⁺(aq)? (F = 96,500 C/mol)

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Chemistry

07/25/22

What is ∆G° for a redox reaction where 6 moles of electrons are transferred and E° =-3.65 V? (F = 96,500 J/(V･mol))

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Chemistry

07/24/22

Calculate the mass (in grams) of (NH4)2CO2 in a sample that contains 8.491 x 10^29 atoms of hydrogen

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Chemistry

07/24/22

Oxidation-Reduction

Balance the following redox reaction in an acidic solution, using the half-reaction method.BrO3- (aq) + NO2(aq) 🡪 Br-(aq) + NO3-(aq)

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Chemistry

07/24/22

Calculate the cell potential and the equilibrium constant for the following reaction at 298 K: Fe2+(aq) + H2(g) Fe(s) + 2H+(aq)

Carry at least 5 significant figures during intermediate calculations to avoid round off error when taking the antilogarithm.

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Chemistry

07/23/22

Determine the pH of a 0.22 M NaF solution at 25°C. The Ka of HF is 6.8 × 10^-4.

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Chemistry

07/22/22

Stoichiometry And Reactions

Small quantities of hydrogen gas can be prepared in the laboratory by placing zinc metal in aqueous hydrochloric acid. Typically the hydrogen gas is bubbled through water for ease of collection and... more

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Chemistry

07/22/22

Phenol Equalibrium

Phenol, C6H5OH, partially dissociates in water as shown.C6H5OH(aq) + H2O(l) H3O+(aq) + C6H5O−(aq)If Ka is 1.6 10−10 and the concentrations of H3O+(aq) and C6H5O−(aq) are both 1.0 10−5 M at... more

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Science Chemistry Organic Chemistry

07/22/22

15.00 g aluminum sulfide and 10.00 g water react until the limiting reagent is used up. How much of the excess reactant is left over? Al2S3 + 6 H2O → 2Al(OH)3 + 3 H2S (Show your work )

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Science Chemistry Organic Chemistry

07/22/22

In the reaction represented by the equation 2Al2O3 ® 4Al + 3O2, calculate the theoretical amount in grams of oxygen, O2 produced if 17.93 grams Al2O3 decomposes? Show your work

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Chemistry

07/22/22

Given the balanced equation: 3 H2 + N2 🡪 2 NH3 , how many moles of NH3 will be produced if 50.8 g N2 reacts with 187.3 g H2?

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Chemistry

07/22/22

I need help this problem??!

For each of the following 3 fuels:a. Determine ΔG°rxn for the combustion reaction: a “fuel” + b O2(g) → c CO2(g) + d H2O(g)b. How much Gibb’s Free Energy is liberated by burning 34.274g of the... more

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Chemistry

07/21/22

What is the balanced chemical equation for each half-reaction and their overall reaction?

Write out the balanced chemical equation for each half-reaction and their overall reaction?Anode: Cr(s) → Cr+3(aq) Cathode: I2(aq) → I-1(aq) Anode: NO3-1aq) → HNO2 (aq) Cathode: Au+3(aq) → Au(s)... more

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Chemistry

07/21/22

Can I get some help with this problem??

You combined 86.0mL of 0.385M aqueous calcium nitrate solution with 80.0mL of 0.362M aqueous potassium phosphate solution to form a white precipitate. After you have filtered and dried the white... more

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Chemistry

07/21/22

what is the concentration of CN-1(aq) that is still in solution when it reaches eq??

Iron(II) nitrate and hydrocyanic acid react to form the hexacyanoferrate(II) ion, [Fe(CN)6]-4(aq), with a formation constant of 3.284 x 1031. A.) If you add 134.787g of iron(II) nitrate solid to... more

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Chemistry

07/21/22

Complete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the reaction. Te(s) + NO3(aq)- --> TeO3^2- (aq) + N2O4(g)

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Answers •1

Please help me on this question below!

At 25°C, an acid has a pKa value of 5,73; this corresponds to a standard ΔGsys value (in kcalmol-1) of...?

The mass of KCl solid(AR grade) to prepare a 1000 ppm K solution in a 500 mL volumetric flask

Partial Pressure Help

Gas Homework Help

Gas Homework Help

Potassium permanganate, KMnO4, is both effective at treating water and has medical uses.

excess sodium phosphate is mixed with 778.6 ml of strontium chloride at a concentration of 0.309 mol/l. if the reactions has a 67.50% yield, what is the mass of dry precipitate actually collected.

What is the average rate of this reaction?

How many coulombs of charge are necessary to produce 395 g of Al from Al³⁺(aq)? (F = 96,500 C/mol)

What is ∆G° for a redox reaction where 6 moles of electrons are transferred and E° =-3.65 V? (F = 96,500 J/(V･mol))

Calculate the mass (in grams) of (NH4)2CO2 in a sample that contains 8.491 x 10^29 atoms of hydrogen

Oxidation-Reduction

Calculate the cell potential and the equilibrium constant for the following reaction at 298 K: Fe2+(aq) + H2(g) Fe(s) + 2H+(aq)

Determine the pH of a 0.22 M NaF solution at 25°C. The Ka of HF is 6.8 × 10^-4.

Stoichiometry And Reactions

Phenol Equalibrium

15.00 g aluminum sulfide and 10.00 g water react until the limiting reagent is used up. How much of the excess reactant is left over? Al2S3 + 6 H2O → 2Al(OH)3 + 3 H2S (Show your work )

In the reaction represented by the equation 2Al2O3 ® 4Al + 3O2, calculate the theoretical amount in grams of oxygen, O2 produced if 17.93 grams Al2O3 decomposes? Show your work

Given the balanced equation: 3 H2 + N2 🡪 2 NH3 , how many moles of NH3 will be produced if 50.8 g N2 reacts with 187.3 g H2?

I need help this problem??!

What is the balanced chemical equation for each half-reaction and their overall reaction?

Can I get some help with this problem??

what is the concentration of CN-1(aq) that is still in solution when it reaches eq??

Complete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the reaction. Te(s) + NO3(aq)- --> TeO3^2- (aq) + N2O4(g)

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