Recent questions in Chemistry

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How can capillary electrophoresis (CE) be used to determine the quantity of specific ions or molecules in a sample, and what are the factors that could affect the accuracy and reproducibility of the CE analysis results?

asked Jan 29 in Analytical Chemistry by PenneyMaxey5 (2.0k points)

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1 answer 59 views

How can atomic absorption spectroscopy be used to quantitatively determine the concentration of lead (Pb) in a water sample taken from a local river? What steps must be taken to prepare the sample and calibrate the spectroscopic instrument? How can the results be verified and reported?

asked Jan 29 in Analytical Chemistry by MarianCocket (2.0k points)

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1 answer 66 views

How accurately can we determine the purity of a given sample of a substance using melting point determination and what are the possible sources of error in this process?

asked Jan 29 in Analytical Chemistry by Rosaline02Y (2.0k points)

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1 answer 62 views

Given the molecular formula and NMR spectrum of an unknown compound, can you identify the structure of the compound using nuclear magnetic resonance spectroscopy?

asked Jan 29 in Analytical Chemistry by ChuWegener2 (2.1k points)

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1 answer 58 views

Given an unknown compound, how can one identify its molecular formula and structural information using mass spectrometry? Provide a step-by-step guide on how to interpret the mass spectral data to identify the compound's functional groups and possible structures.

asked Jan 29 in Analytical Chemistry by AntoniettaLa (1.9k points)

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Given a sample of an unknown compound, use nuclear magnetic resonance (NMR) spectroscopy to identify the structure of the compound and determine the number and types of atoms in the compound's molecular formula.

asked Jan 29 in Analytical Chemistry by YVMCinda4278 (2.3k points)

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Determine the structure of an unknown organic compound using nuclear magnetic resonance (NMR) spectroscopy, given the following information: - The compound has a molecular formula of C6H12O2 - The NMR spectrum shows signals at 1.2 ppm (triplet), 2.3 ppm (quartet), and 3.7 ppm (doublet).

asked Jan 29 in Analytical Chemistry by ForrestWalde (1.8k points)

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1 answer 60 views

Determine the molecular formula of an unknown organic compound using mass spectrometry data.

asked Jan 29 in Analytical Chemistry by MarkusOrdone (1.9k points)

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1 answer 65 views

Determine the concentration of lead in a water sample using atomic absorption spectroscopy.

asked Jan 29 in Analytical Chemistry by TarenSalmond (1.8k points)

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1 answer 46 views

Calculate the mole fraction of each component and the total pressure of a gas mixture at 25°C and 2 atm that contains 0.5 moles of methane (CH4) and 0.2 moles of ethane (C2H6).

asked Jan 28 in Chemistry by MargueriteSa (2.1k points)

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1 answer 68 views

Calculate the molar mass of magnesium nitrate [Mg(NO3)2].

asked Jan 23 in Inorganic Chemistry by ChanteStroh (1.5k points)

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1 answer 46 views

Calculate the molar mass of barium nitrate (Ba(NO3)2).

asked Jan 23 in Inorganic Chemistry by ElsieBidmead (2.1k points)

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1 answer 60 views

Calculate the molar mass of ammonium sulfate ((NH4)2SO4), given that the atomic masses of nitrogen, hydrogen, sulfur, and oxygen are 14.01 g/mol, 1.01 g/mol, 32.06 g/mol, and 16.00 g/mol, respectively.

asked Jan 23 in Inorganic Chemistry by SherrylIwz83 (2.0k points)

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1 answer 62 views

Calculate the melting point of sodium chloride (NaCl) given that its enthalpy of fusion is 28.9 kJ/mol and its entropy of fusion is 41.3 J/K/mol.

asked Jan 23 in Inorganic Chemistry by KyleWaddy213 (1.9k points)

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1 answer 44 views

Calculate the melting point of aluminum oxide (Al2O3) given that its enthalpy of fusion is 326 kJ/mol and its entropy of fusion is 110 J/(mol*K). Assume standard pressure and temperature conditions (STP).

asked Jan 23 in Inorganic Chemistry by RandellBeggs (2.0k points)

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1 answer 68 views

Calculate the melting point of a solution containing 20 g of benzoic acid (C6H5COOH) and 80 g of naphthalene (C10H8). The melting points of pure benzoic acid and naphthalene are 122.4 °C and 80.2 °C, respectively. The molal freezing point depression constant for naphthalene is 6.8°C/m.

asked Jan 23 in Physical Chemistry by PDQJenifer7 (2.0k points)

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1 answer 51 views

Calculate the melting point of a mixture of 1 mol of benzene and 2 mol of toluene, given that the pure components have melting points of 5.5 °C and -95.0 °C, respectively.

asked Jan 23 in Physical Chemistry by JanieCorso7 (1.9k points)

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1 answer 73 views

Calculate the melting and boiling points of Sodium Chloride (NaCl) using the Clausius-Clapeyron Equation given that the heat of fusion for NaCl is 28.9 kJ/mol, the heat of vaporization is 163.0 kJ/mol and the standard entropy change for phase transition is 72.14 J/K/mol.

asked Jan 23 in Inorganic Chemistry by ZKLBarbra368 (2.3k points)

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1 answer 62 views

Calculate the mass of sodium chloride (NaCl) produced when 2.5 moles of sodium (Na) react completely with excess chlorine gas (Cl2). (Hint: Use the balanced chemical equation 2Na + Cl2 → 2NaCl)

asked Jan 23 in Chemical reactions by FranY1408156 (2.2k points)

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1 answer 65 views

Calculate the mass of silver (Ag) that will be deposited on the cathode during electrolysis if a current of 2.5 A is passed through a solution of silver nitrate (AgNO3) for 3 hours.

asked Jan 23 in ElectroChemistry by MarquisMonte (1.9k points)

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