02/25/24

Chemistry Question
What volume, in milliliters, of 0.220 M NaOH should be added to a 0.140 L solution of 0.018 M glycine hydrochloride (PKa1 = 2.350, pKa2 = 9.778) to adjust the pH to 2.51?
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02/24/24

chemistry question
Calculate the pH for each of the cases in the titration of 35 mL of 0.130 M KOH(aq) with 0.130 M HBr(aq). I already know the first four I'm stuck on the last two.Before addition of any HBr:... more
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02/24/24

Determine the rate law for this reaction.

The rate of the reactionNO2​(g) + CO(g)NO(g) + CO2​(g)was determined in three experiments at 225°C. The results are given in the following table:  Experiment [NO2]0 (M) [CO]0 (M) Initial Rate... more
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02/24/24

If the reaction is begun with an initial PH3 concentration of 0.95 M, what will be the concentration of PH3 after 36.50 s?
The rate of decomposition of PH3 was studied at 961.00 °C. The rate constant was found to be 0.0815  s–1.4PH3 --> P4 + 6H2If the reaction is begun with an initial PH3 concentration of 0.95 M,... more
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02/24/24

chemistry ions, isoelectronic series
Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with Kr
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02/24/24

Colligative properties
If the boiling point constant of water is 0.51 C/M and the 400 g sample of aqueous solution whose boiling point is 101.1 C, how many grams of fructose (C5H10O5) are dissolved?
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02/23/24

Determine the molarity of Ni2+ ions.
Determine the molarity of Ni2+ ions in solution when 5.57×10-1 g of nickel(II) nitrate is added to enough water to prepare 3.58×102 mL of the solution.
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02/23/24

The activation energy for a particular reaction is 102 kJ/mol. If the rate constant is 1.35 × 10⁻⁴ s⁻¹ at 302 K, what is the rate constant at 273 K?
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02/23/24

What volume of carbon dioxide is produced if 8.68 L of oxygen is consumed during the combustion of the ethanol in the car's engine? Assume constant temperature and pressure.
C2H5OH(G)+3O2(g)=2CO2(g)+3H2O(g)
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02/22/24

Determine the molarity of sodium dichromate and the mole fraction of ammonium nitrite.
The mole fraction of an aqueous solution of sodium dichromate is 0.283. Calculate the molarity (in mol/L) of the sodium dichromate solution, if the density of the solution is 1.50 g... more
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02/21/24

How to solve this?
100.0 g of a ground mineral sample consisting of a mixture of MgCO₃ (magnesite) and BaCO₃ (witherite) was heated to completely convert the carbonates to their metal oxides. After the reaction 58.95... more
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02/21/24

What is the molarity of potassium fluoride?
An aqueous solution of potassium fluoride is prepared by dissolving 3.67 g of potassium fluoride in 8.03×102 g of water. The density of the solution is 1.24 g mL-1.Determine the molarity (in mol/L)... more
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02/21/24

Need help with chemistry problem.
the NaOH solution is standardized with KHP in this lab. If about 0.8 grams of KHP (MW=204.22 g/mol) is titrated with approximately 0.1 M NaOH what is the approximate volume of NaOH required to... more
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02/21/24

Balancing Equations
Balance the equation. Then add up the coefficients on both sides of this properly balanced equation and identify the total~N2 + H2 → NH3~KNO3 + H2CO3 → K2CO3 + HNO3~Na3PO4 + HCl → NaCl +... more
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02/21/24

How do do I work this problem?
Valproic acid, a medication used to treat epilepsy and bipolar mania, contains only C, H, and O. Combustion of 1.000 g of valproic acid produces 2.441 g of CO₂ and 1.000 g of H₂O. Determine the... more
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02/21/24

Empirical and Molecular Formula
A compound containing only phosphorous and oxygen was found to have 43.64 % phosphorous by mass and 56.36 % oxygen by mass. The molecular formula has a molar mass of 141.94 g/mol.  Determine... more
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02/20/24

Empirical and Molecular Formula
A compound containing only nitrogen and oxygen was found to have 25.936% nitrogen by mass and 74.064% oxygen by mass. The molecular formula has a molar mass of 216.04 g/mol.  Determine... more
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02/18/24

How to solve this delta G problem? (gen chem 2)
The evaporation of one mole of water at 298 K has a standard free energy change of 8.58 kJ.H2O(l)⇌H2O(g) ΔG°=8.58 kJ (a) Is the evaporation of water under standard thermodynamic conditions... more
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02/18/24

Solving for a reactant using a chemical equation
A major component of gasoline is octane (C8H18). When octane is burned in air, it chemically reacts with oxygen gas (O2) to produce carbon dioxide (CO2) and water (H2O) .What mass of carbon dioxide... more
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02/18/24

I need help with this delta G question!! (gen chem 2)
A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of ATP to ADP as described by the reactionATP(aq) + H2O(l) -->... more
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02/17/24

Percentage Yield
Gaseous methane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . If 3.56 g of carbon dioxide is produced from the reaction of 1.8 g of methane and 9.6 g of... more
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02/17/24

You have a solution which is 32.2% by mass isopropyl alcohol (MM = 60.11 g/mol) in water. The density of this solution is 0.905 g/mL. What is the molality of the isopropyl alcohol in the solution?
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02/17/24

Calculate the volume in mL of a 0.250 M KOH solution that should be added to 5.250g of HEPES (MW=238.306g/mol and pKa=7.56) to give pH of 7.88
Calculate the volume in mL of a 0.250 M KOH solution that should be added to 5.250g of HEPES (MW=238.306g/mol and pKa=7.56) to give pH of 7.88.KOH volume = mL
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02/17/24

You are asked to prepare 500mL 0.100M acetate buffer using only pure acetic acid (MW= 60.05g/mol and pKa= 4.76), 3.00 M NaOH and water

You are asked to prepare 500mL 0.100M acetate buffer using only pure acetic acid (MW= 60.05g/mol and pKa= 4.76), 3.00 M NaOH and waterWhat volume of 3.00 M NaOH must be added to the acetic acid to... more
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02/17/24

What is the fraction of association?
What is the fraction of association for each potassium propionate solution? The Ka of propanoic acid is 1.34 x 10^-52.00 x 10^-1 M K(C2H5COO2) = ?2.00 x 10^-2 M K(C2H5COO2) = ?2.00 x... more
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