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Chemistry

04/23/24

The label on a 2.0e+02 mL stock bottle reads "20.5% alcohol by volume."

What volume of alcohol does it contain?

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Chemistry

04/23/24

The solubility of a gas in water is 0.11 g/L at 24.2kPa of pressure.

What is the solubility when the pressure is increased to 115kPa?

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Chemistry

04/23/24

What percent by volume of 27 mL if methanol in 65 mL if water?

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Chemistry

04/23/24

What pressure is required to reduce 59 mL of a gas at standard conditions to 15 mL at a temperature of 20◦C? Answer in units of atm.

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Chemistry

04/22/24

What is the wavelength of the radiation corresponding to this band gap?

What is the wavelength of the radiation corresponding to this band gap?ZnO is a semiconductor whose band gap is 308.71 kJ/mol at room temperature. I think I need to use the equation E(g) = hc/... more

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Chemistry

04/22/24

Voltaic Cells Chemistry

A voltaic cell using Cu²⁺/Cu and Al³⁺/Al half-cells is set up at standard conditions, and each compartment has a volume of 225 mL. What is the [Al³⁺] after the cell has delivered 0.120 A for 89.0... more

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Chemistry

04/22/24

For the galvanic (voltaic) cell Fe(s) + Mn²⁺(aq) ⟶ Fe²⁺(aq) + Mn(s) (E° = 0.77 V at 25 °C), what is [Fe²⁺] if [Mn²⁺] = 0.035 M and E = 0.78 V? Assume T is 298 K

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Chemistry

04/22/24

What is the theoretical yield of H2SiF6? What is the percent yield?

Hydrofluoric acid solutions cannot be stored in glass containers because HF reacts readily with silica dioxide in glass to produce hexafluorosilicic acid (H2SiF6).SiO2(s) + 6 HF(aq) H2SiF6(aq) + 2... more

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Chemistry Biology

04/21/24

In what report should the solutions of the salt 55% and 20% be mixed to obtain a 40% salt solution.

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Chemistry

04/20/24

Given the equation: CH4 (g) + 2 O2 (g) ⇋ CO2 (g) + 2 H2O (g) What direction will the reaction shift when more H2O (g) is removed?

Given the equation:CH4 (g) + 2 O2 (g) ⇋ CO2 (g) + 2 H2O (g)What direction will the reaction shift when more H2O (g) is removed?

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Chemistry

04/19/24

What quantity in moles of NaOH need to be added to 200.0 mL of a 0.200 M solution of HF to make a buffer with a pH of 4.00? (Ka for HF is 6.8 × 10⁻⁴)

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Chemistry

04/19/24

Calculate the percentage yield for SiO2

In the following reaction, oxygen is the excess reactant.SiCl4 + O2 → SiO2 + Cl2The table shows an experimental record for the above reaction. Experimental RecordTrialStarting Amount of... more

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Chemistry

04/19/24

Determine the empirical formula of a compound containing 47.37 grams of carbon, 10.59 grams of hydrogen, and 42.04 grams of oxygen

Determine the empirical formula of a compound containing 47.37 grams of carbon, 10.59 grams of hydrogen, and 42.04 grams of oxygen.In an experiment, the molar mass of the compound was determined to... more

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Chemistry

04/18/24

finding frequency in chemistry problem

A local FM radio station broadcasts at an energy of 6.12 * 10^-29 kJ/photon. (1 MHz=10^6 s^-1) Calculate the frequency at which it is broadcasting. Frequency = _____MHz

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Chemistry

04/18/24

which of the following changes would increase the rate of a reaction between vinegar and sodium hydroxide

According to the collision theory, which of the following changes would increase the rate of a reaction between vinegar and sodium hydroxide? (3 points) Cooling the sodium... more

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Chemistry

04/18/24

Calculate the equilibrium constant at 298.15 K for the reaction.

Oxaloacetate2−(aq)+NADH(aq)+H+(aq)malate2−(aq)+NAD+(aq)The standard potential has been calculated at .164 VCalculate the equilibrium constant at 298.15 K for the reaction.

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Chemistry

04/18/24

Write a balanced net ionic equation for the redox reaction of Ag2S and Al metal that produces Ag metal and Al(OH)3.

Write a balanced net ionic equation for the redox reaction of Ag2S and Al metal that produces Ag metal and Al(OH)3. Low concentrations of hydrogen sulfide in air react with silver to form Ag2S,... more

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Chemistry

04/18/24

What is the value of Ecell for this reaction when [Fe3+] = [Cu+] = 1.50 × 10–3 M and [Fe2+] = [Cu2+] = 2.50 × 10–4 M?

What is the value of Ecell for this reaction when [Fe3+] = [Cu+] = 1.50 × 10–3 M and [Fe2+] = [Cu2+] = 2.50 × 10–4 M? Consider an electrochemical cell based on the following... more

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Chemistry

04/17/24

Complete and balance the following half-reaction in acidic solution. H2SO3(aq) -> SO4 2- (aq)

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Chemistry

04/17/24

what is the pH of the buffer?

What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.060 mol of NaOH were added?

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Chemistry

04/17/24

Struggling on these 3 questions for chem and need help?

The Ksp Of lanthanum iodate, La(IO3)3, is 7.50 × 10^-12. Calculate the molar solubility, x, of this compound. Answer in M. A solution contains 0.0460 M Ca^2+ and 0.0910 M Ag^+. When the second... more

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Chemistry

04/16/24

Using the data in the table, determine the rate constant of the reaction and select the appropriate units.

A+2B->C+DTrial...[A](M)...[B](M)...Rate(M/s)1...0.350...0.320...0.01022...0.350...0.640...0.01023...0.700...0.320...0.0408k=

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Chemistry

04/16/24

Calculate the amount of americium-241

Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 5.0000 µg of Am), in micrograms, that has been used for... more

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Chemistry

04/16/24

Calculate the energy in J?

Calculate the energy released, in J, when 1.00 kg of uranium-235 undergoes the following fission process. ¹₀n + ²³⁵₉₂U → ¹³⁶₅₃I + ⁹⁶₃₉Y + 4¹₀nIodine-136: 135.8401 amuYttrium-96: 95.8629... more

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Chemistry

04/16/24

What is the binding energy in kj/mol?

What is the binding energy (in kJ/mol) for Ag-107? The mass of a hydrogen atom is 1.00783 amu, the mass of a neutron is 1.00867 amu, and the atomic mass of this isotope is 106.90509 amu.

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The label on a 2.0e+02 mL stock bottle reads "20.5% alcohol by volume."

The solubility of a gas in water is 0.11 g/L at 24.2kPa of pressure.

What percent by volume of 27 mL if methanol in 65 mL if water?

What pressure is required to reduce 59 mL of a gas at standard conditions to 15 mL at a temperature of 20◦C? Answer in units of atm.

What is the wavelength of the radiation corresponding to this band gap?

Voltaic Cells Chemistry

For the galvanic (voltaic) cell Fe(s) + Mn²⁺(aq) ⟶ Fe²⁺(aq) + Mn(s) (E° = 0.77 V at 25 °C), what is [Fe²⁺] if [Mn²⁺] = 0.035 M and E = 0.78 V? Assume T is 298 K

What is the theoretical yield of H2SiF6? What is the percent yield?

In what report should the solutions of the salt 55% and 20% be mixed to obtain a 40% salt solution.

Given the equation: CH4 (g) + 2 O2 (g) ⇋ CO2 (g) + 2 H2O (g) What direction will the reaction shift when more H2O (g) is removed?

What quantity in moles of NaOH need to be added to 200.0 mL of a 0.200 M solution of HF to make a buffer with a pH of 4.00? (Ka for HF is 6.8 × 10⁻⁴)

Calculate the percentage yield for SiO2

Determine the empirical formula of a compound containing 47.37 grams of carbon, 10.59 grams of hydrogen, and 42.04 grams of oxygen

finding frequency in chemistry problem

which of the following changes would increase the rate of a reaction between vinegar and sodium hydroxide

Calculate the equilibrium constant at 298.15 K for the reaction.

Write a balanced net ionic equation for the redox reaction of Ag2S and Al metal that produces Ag metal and Al(OH)3.

What is the value of Ecell for this reaction when [Fe3+] = [Cu+] = 1.50 × 10–3 M and [Fe2+] = [Cu2+] = 2.50 × 10–4 M?

Complete and balance the following half-reaction in acidic solution. H2SO3(aq) -> SO4 2- (aq)

what is the pH of the buffer?

Struggling on these 3 questions for chem and need help?

Using the data in the table, determine the rate constant of the reaction and select the appropriate units.

Calculate the amount of americium-241

Calculate the energy in J?

What is the binding energy in kj/mol?

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