25,963 Answered Questions for the topic chemistry

Chemistry

02/29/24

The pH of a solution is measured to be 5.4. Calculate the following:
The pH of a solution is measured to be 5.4. Calculate the following:[H3O+]pOH[OH-]
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Chemistry

02/29/24

Solving for a reactant in a solution
One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is by titrating a sample of silver nitrate solution. Any chloride anions in solution will combine... more
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Chemistry

02/29/24

Dillution Chemical Reactions
A chemist must prepare 275.mL of 92.0μM aqueous mercury(II) iodide HgI2 working solution. She'll do this by pouring out some 94.8μmolL aqueous mercury(II) iodide stock solution into a graduated... more
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Chemistry

02/29/24

Na2CO3 + Ca(NO3)2 → CaCO3 + 2NaNO3 what mass of calcium nitrate in grams is needed to produce 5.69mol of sodium nitrate?
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Chemistry

02/28/24

how do I find my ratio of moles of KClO3 decomposed to Moles of O2 produced?
i have the moles of KClO3 decomposed and O2 created but how do I find the ratio? I'm told the ratio has to be one of these 2:1, 1:1, 2:3. I have 0.020 mol KClO3 and 0.019 mol O2.
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Chemistry

02/28/24

What is the maximum mass of S8 that can be produced by combining 86.0 g of each reactant? 8SO2 + 16H2S —-> 3S8 + 16H2O
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Chemistry

02/28/24

Can a covalent network crystal with sp3d2 hybridization form a 2d solid?
For example, XeF4
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Chemistry

02/28/24

Separation of charcoal/NaCl/CuCl2

When provided with a solid mixture of charcoal, NaCl, CuCl2 and given only water and ethanol, how can you separate the three?
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Chemistry

02/28/24

A 2.50 L vessel is injected with 5.42 mols of C2H6, 8.90 mols of O2, 6.14 mols of H2O, and 2.67 mols of CO2.

A 2.50 L vessel is injected with 5.42 mols of C2H6, 8.90 mols of O2, 6.14 mols of H2O, and 2.67 mols of CO2. Set up but do not solve the equation to find equilibrium concentrations if Kc for this... more
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Chemistry

02/28/24

Calculate the moles of ascorbic acid and the molarity of the unknown solution based on the following information.
You have 5 mL of an unknown solution, and 50 mL of distilled water and 1 mL of starch indicator solution is added. The sample is titrated and uses a total of 20.5 mL of iodine. The iodine solution... more
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Chemistry

02/28/24

Chemistry Question
What is the concentration of an HF solution if its pH is 1.7? a. 0.57 b. 0.027 C. 0.020 d. 7.2 x 10^-4 e. 5.0 x 10^-13
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Chemistry

02/28/24

Calculate the enthalpy for the following reaction (using the Standard Enthalpy of Formation Table): 2F2(g) + 2H2O(l) --- 4HF(g) + O2(g)
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Chemistry

02/27/24

Determine the energy in an x-ray photon with a wavelength of 75. pm. (h=6.626x10-34J*s)

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Chemistry

02/27/24

determine the pH of the solution.
A solution is made by dissolving 15.7 g of CH₃NH₃NO₃ in 500.0 mL of water. Using Ka(CH₃NH₃⁺) = 2.3 × 10⁻¹¹, determine the pH of the solution.
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Chemistry

02/27/24

Calculate the value of Ka for this acid.
A 0.250 g sample of the weak acid HA (molar mass = 150.0 g/mol) is dissolved in 50.0 g of water. The freezing point of the resulting solution is -0.071 °C. Calculate the value of Ka for this acid.... more
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Chemistry

02/27/24

Calculate the [NH₃] in a solution of 0.250 M ammonium fluoride (NH₄F).

Calculate the [NH₃] in a solution of 0.250 M ammonium fluoride (NH₄F). Hint: Use the Ka of HF (6.8 × 10⁻⁴) and the Kb of NH₃ (1.8 × 10⁻⁵) to calculate Kc for the reaction NH₄⁺(aq) + F⁻(aq) ⇌... more
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Chemistry

02/27/24

Mixed Practice Stoichiometry WS
How many grams of silver bromide can be made from 34.7 g silver nitrate when silver nitrate and sodium bromide react? How many liters carbon dioxide gas are produced when 25.2 g of propane... more
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Chemistry

02/26/24

Calculating molarity using solute moles
A chemist prepares a solution of mercury(I) chloride Hg2Cl2 by measuring out 0.00011μmol of mercury(I) chloride into a 50.mL volumetric flask and filling the flask to the mark with water.Calculate... more
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Chemistry

02/26/24

Calculating molarity using solute moles
A chemist prepares a solution of barium acetate BaCH3CO22 by measuring out 117.μmol of barium acetate into a 150.mL volumetric flask and filling the flask to the mark with water. Calculate the... more
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Chemistry

02/26/24

Calculating Molarity using Solute Moles
A chemist prepares a solution of magnesium fluoride MgF2 by measuring out 0.0531μmol of magnesium fluoride into a 500.mL volumetric flask and filling the flask to the mark with water.Calculate the... more
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Chemistry

02/26/24

I don't understand CHM 151 please help :)
A 0.436 g sample of the acid is titrated with 0.185 M NaOH. What is the molar mass of the compound is 13.1 mL of the NaOH solution is required to nutrilize the sample
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Chemistry

02/26/24

HELP Aqueous chem question
How do you calculate for the speciation of Cu(II) for freshwater at a pH value of 8.3 as the hardness increases from 20 (soft) to 100 (moderately hard) to 200 (very hard) mg / L as CaCO3? We are... more
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Chemistry

02/26/24

calculate the concentration of H₂ after equilibrium is reestablished.
For the following reaction at a certain temperature H₂(g) + F₂(g) ⇌ 2HF(g) the equilibrium concentrations in a 10.00-L rigid container are [H₂] = 0.0600 M, [F₂] = 0.0200 M, and [HF] = 0.620 M. If... more
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Chemistry

02/25/24

What is Kp for this reaction

An evacuated reaction vessel is filled with NOBr to an initial pressure of 5.00 atm. When the system reaches equilibrium according to the reaction below, there are 0.750 atm of Br₂. What is Kp for... more
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Chemistry

02/25/24

What is Kc for this equilibrium
Solid Ca₃(PO₄)₂ is placed into 10.0 L of water. When equilibrium is established, the concentration of Ca²⁺ is 2.3 × 10⁻⁴ M. What is Kc for this equilibrium? Note Kc is sometimes called K. Ca₃(PO₄)₂... more
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