07/13/22

Gamma radiation has frequencies in the 1020 Hz range. What is the wavelength in meters of gamma radiation with a frequency of 3.82 x 1020 Hz?
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07/13/22

The hydrogen line spectrum has four lines that are in the visible range. The red line occurs at 421.7 nm what is the frequency in Hertz?
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07/13/22

Help me solve this
You prepared a saturated solution of copper(I) chloride (Ksp = 1.248x10-6) in pure water. What are theconcentrations of Cu+1(aq) and Cl-1(aq) ions in the saturated solution?
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07/13/22

What is the concentration of the phosphoric acid solution?
You prepared a solution of phosphoric acid for use in a series of precipitation experiments. To determine its concentration, you have titrated 26.00mL of the phosphoric acid solution to the second... more
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07/13/22

Consider the reaction of SiF4 with H2O to form HF and SiO2. If 4.13 g SiF4 is reacted with excess H2O and 2.14 g of HF is ultimately isolated, what is the percent yield for the reaction?
Consider the reaction of SiF4 with H2O to form HF and SiO2. If 4.13 g SiF4 is reacted with excess H2O and 2.14 g of HF is ultimately isolated, what is the percent yield for the reaction?Percent... more
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07/13/22

Chemistry 102: acids: Find Kc
10.Automobiles and trucks pollute the air with NO. At 2000.0°C, Kc for the reaction is 6.22 × 10–4, and ΔH∘for the reaction is 180.6 kJ.N2​(g)+O2​(g)2NO(g)What is the value of Kc at 1000.0°C?please... more
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07/12/22

Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 2.31 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵) What is the pH of the buffer after 0.250 mol of OH⁻ have been added?
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07/12/22

What is the concentration of lead(II) ions in a saturated solution of lead(II) fluoride?
What is the concentration of lead(II) ions in a saturated solution of lead(II) fluoride?Ksp(PbF2) = (3.991x10^-8)
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07/12/22

What is the concentration of silver(I) ions in a saturated solution of silver(I) sulfate?
What is the concentration of silver(I) ions in a saturated solution of silver(I) sulfate?Ksp(Ag2SO4) = (1.277x10^-5)
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07/12/22

What are the concentrations of Cu+1(aq) and Cl-1(aq) ions in the saturated solution?
You prepared a saturated solution of copper(I) chloride (Ksp = 1.248x10-6), but this time instead of using pure water as the solvent, you use a 0.04172M solution of sodium chloride as the solvent.... more
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07/11/22

May I be able to get help on this one as well please?
A solution was prepared with 0.380 mol of pyridinium fluoride (C5H5NHF) and enough water to make a 1.00 L. Pyridine (C5H5N) has a 𝐾b=1.70×10^−9 and HF has a 𝐾a=6.30×10^−4.Calculate the pH of... more
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07/11/22

Ionization Constants

Determine the relative acid strengths of NH4+NH4+ and HCN by comparing their ionization constants. The ionization constant of HCN is 4.9 ×10−10. For the ionization constant of NH4+, the ionization... more
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07/11/22

I need help solving for the Ka for this acid?
You prepared an aqueous solution of a monoprotic acid (formula mass = 153.482g/mol) by dissolving 26.816g of the acid in sufficient water to make 500.0mL of solution. The pH of the resulting... more
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07/11/22

Calculate the pH of a 0.173 M solution of NaNO2. The ionization constant, 𝐾a, for the acid, HNO2, is 4.60×10−4. pH=
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07/11/22

May I get help on this?
At a certain temperature, the equilibrium constant, 𝐾,K, for the given reaction is 53.3.H2(g)+I2(g)↽−−⇀2HI(g)𝐾=53.3At this temperature, the reactants were placed in a container to react. If the... more
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07/11/22

Can I get help on this?
At equilibrium, an aqueous solution of formic acid (HCHO2) has these concentrations: [H+]=0.0021 M; [CHO2−]=0.0021 M; and [HCHO2]=0.0245 M.HCHO2(aq)↽−−⇀H+(aq)+CHO−2(aq)What is the value... more
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07/11/22

General Chemistry 2
When the following equation is balanced properly under basic conditions, what are the coefficients of the species shown? Cl- +  S   ClO- +  S2-Water appears in the balanced equation as a fill in... more
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07/11/22

Chemistry 102: Solubility: word problem explanation needed
1. Suppression of the solubility of one ion by the addition of the counter-ion in its insoluble salt is known as the ___[common-ion effect].Explain why the answer is [common-ion effect]
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07/11/22

Calculate the energy change during a phase change.
Given the following information for tin, Sn (at 1 atm), calculate the amount of heat in kJ needed (at 1 atm) to melt a 40.6-g sample of solid tin at its normal melting point of 232 °C. boiling... more
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07/11/22

Use Avogadro's law to calculate volume.
A sample of gas contains 0.140 mol of N2(g) and 0.280 mol of H2(g) and occupies a volume of 19.0 L. The following reaction takes place:N2(g) + 2H2(g)N2H4(g)Calculate the volume of the sample after... more
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07/11/22

Calculate the amount of gas produced when collected by water displacement.
Oxygen gas can be prepared by heating potassium chlorate:2KClO3(s)2KCl(s) + 3O2(g)In one experiment, a sample of KClO3 reacts and the gas produced is collected by water displacement. The gas sample... more
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07/11/22

Calculate pressure using Dalton's law of partial pressures.
A gas mixture is made up of H2 (0.581 g), He (1.15 g), and Ne (7.02 g). The mixture has a volume of 33.1 L at 80 °C. Calculate the partial pressure of each gas in the mixture and the total pressure... more
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07/11/22

A mixture of helium and neon gases, at a total pressure of 851 mm Hg, contains 0.666 grams of helium and 2.55 grams of neon. What is the partial pressure of each gas in the mixture?
A mixture of helium and neon gases, at a total pressure of 851 mm Hg, contains 0.666 grams of helium and 2.55 grams of neon. What is the partial pressure of each gas in the mixture?PHe = _____ mm... more
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07/11/22

The molar mass of the unknown gas is____g/mol.
A sample of O3 gas is observed to effuse through a porous barrier in 9.33 minutes. Under the same conditions, the same number of moles of an unknown gas requires 5.08 minutes to effuse through the... more
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07/11/22

Chemistry 102: Acids: find pH of solution
14.Ascorbic acid (vitamin C, C6H8O6) is a diprotic acid (Ka1 = 8.0×10–5 and Ka2 = 1.6×10–12). What is the pH of a 0.220 M  solution of ascorbic acid?
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