03/31/24

Consider the titration of 50.0 mL of 0.310 M weak base B (Kb = 7.5 x 10⁻⁶) with 0.340 M HNO₃. What is the pH of the solution after the addition of 90.0 mL of HNO₃?
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03/31/24

Balance the chemical reaction in basic conditions with lowest whole number cofficients.
Unbalanced Equation:As(s) + H2BO3−(aq) → AsO2−(aq) + B(s)
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03/30/24

Concentration Of The Citric Acid Solution - Titration Data
In this titration, NaOHNaOH is the titrant, and citric acid is the analyte.Please enter your titration data below. Then, with the data on MNet, determine the volume of the analyte, citric acid, at... more
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03/29/24

Consider the titration of 50.0 mL of 0.325 M weak base B (Kb = 7.5 x 10⁻⁶) with 0.340 M HNO₃. What is the pH of the solution after the addition of 90.0 mL of HNO₃?
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03/29/24

Balance the redox reaction in acidic conditions.
Balance the following reaction using the lowest possible whole number coefficients, in acidic conditions. Bi2O4(aq) +  H3PO2(aq) +  H+(aq) +  H2O(l) +  OH−(aq) →  BiO+(aq) +  H3PO3(aq) +  H+(aq)... more
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03/28/24

titration, pH, and volume
Consider the titration of 100.0 mL of 0.200 M CH3NH2 by 0.100 M HCl.(Kb for CH3NH2 = 4.4×10-4)Part 1Calculate the pH after 0.0 mL of HCl added.pH = Part 2Calculate the pH after 35.0 mL of HCl... more
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03/28/24

Rate law for the reaction
2A + B + 3C --> 2D + E order of the reaction respect to A,B,C?Overall order of the reactionIf C is halved how will the rate change?If B is quadrupled, how will the rate change?
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03/28/24

What is the rate constant, k, for the decay of carbon-14?
The wrappings from a mummy discovered in an Egyptian tomb in the Valley of Kings was dated by counting its 14C content. 14C decays by a first-order process with a half-life of 5730 years.What is... more
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03/27/24

Explain the relationship between the rate of effusion of a gas and its molar mass
Explain the relationship between the rate of effusion of a gas and its molar mass.Methane gas (CH4) effuses 3.4 times faster than an unknown gas. Determine the molar mass of the unknown gas. Show... more
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03/27/24

Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g)
Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g). (3 points) 1.Adding a catalyst a.Shift to the left 2.Adding hydrogen gas b.Shift to the... more
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03/27/24

Calculate the mass percent of Na3PO4.H2O in the sample

A 1.5 g sample of a mixture of solid Na3PO4.H2O mixed with NaCl, was dissolved in water, reacted with aqueous 1 M SrCl2 and 0.52g Sr3(PO4)2 precipitate was collected and dried to a constant mass.... more
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03/26/24

Finding the specific heat of a metal sample using calorimetry
You perform a coffee-cup calorimetry experiment using a 6.694 g metal sample. You heated the metal sample to 99.5 degrees celcius as the initial temperature with a Bunsen burner before adding it to... more
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03/26/24

Finding density of an unknown metal
You would like to determine the density of an unknown metal. You fill a graduated cylinder with 10.00 mL of water, add 3.11 g sample of the metal, and read the final volume in the graduated... more
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03/25/24

At 7.0ºC, the volume of a gas is 49 mL. At the same pressure, its volume is 74 mL at what temperature?
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03/25/24

H3PO4, please calculate the pH of the following solutions respectively: (a) 0.0250 M Na3PO4; (b) 0.000250 M of Na2HPO4; (c) 0.000250 M of NaH2PO4
Ka1 = 7.11 × 103, Ka2 = 6.32 × 108, and Ka3 = 4.50 × 1013 for H3PO4,
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03/24/24

Determine the pH of a buffer solution of MOPSO-H and MOPSO.
1. Determine the pH of the buffer solution that is prepared by mixing 925 mL of 0.812 M MOPSO−H (C7H15NO5S ) to 856 mL of 0.340 M MOPSO (C7H14NO5S− ). Assume the 5% approximation is valid. The pKa... more
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03/24/24

A galvanic cell runs for 1.0 minute with a current of 0.20 A. How much charge passed through the cell in that time? (F = 96,500 C/mol)
For Gen chem 2 electrochemistry unit!
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03/24/24

Standard Enthalpy Change

Given the standard enthalpy changes for the following two reactions: 1. 2Pb (s) + O2 (g) yields 2PbO (s) delta H = -434.6 2. 2Zn (s) + O2 (g) yields 2ZnO (s) delta H = -696.6 What is the standard... more
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03/24/24

net ionic equation for magnesium metal with aqueous silver nitrate

net ionic equation for magnesium metal with aqueous silver nitrate
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03/24/24

Chemistry question.
Calculate the standard change in Gibbs free energy, ΔGrxn∘​, for the given reaction at 25.0∘C. Consult the table of thermodynamic properties for standard Gibbs free energy of formation... more
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03/23/24

Carboxylic Acids
If a formic acid in formate buffer is 0.023 M in formic acid and has a pH of 4.07, what is the molar concentration of the formate ion? The pKa of formic acid is 3.75.
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03/23/24

Determine the volume of strontium hydroxide that needs to be added to create a buffer.
Determine the volume (in mL) of 0.230 M strontium hydroxide (Sr(OH)2) that must be added to 83.9 mL of 0.0920 M sodium hydrogen sulfite (NaHSO3) to yield a pH of 6.81.pKa of HSO3 is 7.19 and assume... more
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03/23/24

What is the value of ΔGrxn? (ΔGºrxn = 41.90 kJ)
The partial pressures of N2, H2, and NH3 were measured as 0.603, 1.00, and 0.0100 atm, respectively, in the reaction shown below. Temperature is 650 K.What is the value of ΔGrxn? (ΔGºrxn = 41.90... more
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03/23/24

Making CO from CO2 is a potential energy source. The value of Kp for the reaction is is 1.50 at 700.0°C.
Making CO from CO2 is a potential energy source. The value of Kp for the reaction is is 1.50 at 700.0°C.CO2​(g)+C(s)2CO(g)a. Calculate the equilibrium partial pressure of CO if initially... more
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03/23/24

Calculate the pH of a 3.92×10-3 M solution of NaF, given that the Ka of HF = 6.80 x 10-4 at 25°C.
Calculate the pH of a 3.92×10-3 M solution of NaF, given that the Ka of HF = 6.80 x 10-4 at 25°C.
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