07/11/21

Determine the redox reaction represented by the following cell notation.
Determine the redox reaction represented by the following cell notation.Cd(s) ∣ Cd2+(aq) ‖ Pb2+(aq) ∣ Pb(s)
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07/11/21

The standard enthalpy change for the following reaction is -235 kJ at 298 K. 2 C(s,graphite) + 3 H2(g) + 1/2 O2(g) CH3CH2OH(g) ΔH° = -235 kJ
What is the standard enthalpy change for the reaction at 298 K? 2 CH3CH2OH(g)  4 C(s,graphite) + 6 H2(g) + O2(g
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07/10/21

Can someone please check-over my answers to these Chemistry problems?
(My answers are in bold.)The reaction of an acid and a base produces a(n) _______ and water.A. titrationB. molar solutionC. dilute solutionD. mixtureE. None of the AboveIdentify the base in the... more
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07/10/21

What mass of tin was used to make the tin solution?
In an experiment, a sample of tin metal was dissolved in nitric acid to produce 25.00 mL of solution containing Sn2+. Titration analysis resulted in the calculation that the concentration of... more
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07/10/21

Find the concentration of tin(II) chloride
ProblemWhat is the concentration of a tin(ll) chloride solution prepared from a sample of tin ore?Experimental DesignThe potassium dichromate solution is first standardized by titration with a... more
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07/10/21

dosage and calculation

A continuous infusion of regular insulin at 7 units/hour has been ordered for a patient with type 1 diabetes mellitus. The pharmacy dispensed a standard insulin infusion containing 100 units of... more
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07/10/21

dosage and calculation

A dose of an opioid medication (45 mg) and an anticholinergic medication (0.3 mg) has been ordered for preoperative sedation. The opioid medication is provided in a prefilled syringe containing 50... more
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07/10/21

how do i solve?
What is the energy of 4.43 x 10–3 moles of 1.23 nm X-ray photons?  kJ
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07/10/21

Gamma Radiation wavelength
Gamma radiation has frequencies in the 1020 Hz range. What is the wavelength in meters of gamma radiation with a frequency of 3.12 x 1020 Hz?
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07/09/21

What equation do I use for this problem?
0.700 moles of an unknown solid is placed into water to make 150.0 mL of solution. The solution's temperature decreases by 5.51°C. Calculate ∆H, in kJ/mol, for the dissolution of the unknown solid.... more
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07/09/21

What is the oxidation number of...?
What is the oxidation number of O in PO43–?A. 0B. -1C. -2D. -3E. None of the Above
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07/09/21

Which rule concerning oxidation numbers is true?
A. When a redox reaction occurs, there will always be at least one atom that is oxidized and at least one atom that is reduced.B. Oxidation is the process by which an atom loses electrons.C.... more
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07/09/21

Which rule concerning oxidation numbers is NOT true?
A. Fluorine always has an oxidation number of –1 in molecules that contain two or more types of atoms.B. Oxygen has an oxidation number of –2 in molecules that contain two or more types of atoms.C.... more
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07/09/21

What are the oxidation numbers of K, Cl, and O in KClO3?
A. K = +2, Cl = +4 and O = –2B. K = +1, Cl = +5 and O = –2C. K = +3, Cl = +3 and O = –2D. K = +1, Cl = –5 and O = –2E. None of the Above
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07/09/21

The following thermochemical equation is for the reaction of iron(s) with chlorine(g) to form iron(III) chloride.How many grams of Fe(s) would have to react to produce 99.5 kJ of energy?
2Fe(s) + 3Cl2(g)2FeCl3(s)    H = -799 kJ
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07/08/21

Which is the limiting reactant
Nitrogen gas and hydrogen gas are combined in a reaction to produce ammonia. If 6.0 moles of N2 and 6.0 moles of H2 are present in the mixture, which is the limiting reactant?Show work
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07/08/21

Electromagnetic Spectrum
 A wave has a wavelength of 1.16 x 1015 meters. The frequency of the wave is  A wave has a frequency of 1.50 x 108 Hz. The wavelength of the wave is
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07/07/21

what is the vapor pressure of water above the solution ?
A solution is created by dissolving 42.6 g of glycerin C3H8O3 in 125 g of water at 343k. If the vapor pressure of pure water is 234 torr at this temperature, what is the vapor pressure of water... more
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07/07/21

What is the solubility of that same gas at 835 mmHg?
The solubility of a gas is 2.3 g/L at 760 mmHg. What is the solubility of that same gas at 835 mmHg? temperature remains constant
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07/07/21

If a 0.014M aqueous solution of the unknown compound has an osmotic pressure of 0.905 atm at 25 degree celcuis what is the van’t Hoff factor, for this substance in the solution
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07/07/21

What is the compound's molar mass?
When 3.14g of non-ionizing water soluble compound is dissolved in water to make a 250mL solution, the resulting solution has an osmotic pressure of 0.525 atm at 25 degrees C . What is the... more
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07/07/21

What is the average mass of a single phosphorus atom in grams?
What is the average mass of a single phosphorus atom in grams?
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07/07/21

How much heat does it take to boil 87.1g of copper? The heat of fusion of copper is 49 cal/g and the heat of vaporization is 1212 cal/g
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07/07/21

What is ΔG°rxn?
Given the following equation,H2O(g) + CO(g) → H2(g) + CO2(g) ΔG°rxn = -28.6 kJCalculate ΔG°rxn for the following reaction.8 H2O(g) + 8 CO(g) → 8 H2(g) + 8 CO2(g)
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07/07/21

Estimate ΔG°rxn 
Estimate ΔG°rxn for the following reaction at 800 K.2 Hg(g) + O2(g) → 2 HgO(s)  ΔH°= -304.2 kJ; ΔS°= -414.2 J/K
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