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Assuming that a 0.1 M solution of NH4Cl is at equilibrium with its own ions and NH3 in a closed vessel at 25°C. Calculate the effects on the equilibrium position when solid NH4Cl is added to the solution, and the final concentration of NH4+ and NH3 ions in the solution.

asked Jan 22 in Chemical equilibrium by Reuben64X571 (2.3k points)

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Assuming standard conditions, calculate the standard enthalpy of combustion of methane (CH4), given that the standard enthalpies of formation of CH4 and H2O are -74.8 kJ/mol and -285.8 kJ/mol, respectively. The balanced chemical equation for the combustion of CH4 is:CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) What is the standard enthalpy change (ΔH°) for this reaction?

asked Jan 22 in ThermoChemistry by AguedaD83620 (2.6k points)

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Assuming complete reaction, a chemistry student added 32 grams of reactant A to a reaction mixture that should produce 28 grams of product B. However, the actual yield of B was only 22 grams. What is the percent yield of product B for this chemical reaction?

asked Jan 22 in Chemical reactions by MalcolmUribe (2.0k points)

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Assuming complete combustion, what is the amount of heat energy released when 25 grams of methane (CH4) is burned completely in oxygen gas (O2)? The enthalpy of combustion for methane is -890.4 kJ/mol.

asked Jan 22 in ThermoChemistry by DomenicAsbur (2.1k points)

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Assuming a standard hydrogen electrode is used as the reference electrode and a copper electrode is used as the working electrode in an electrochemical cell, calculate the polarization potential when the current density on the copper electrode is 0.5 mA/cm^2 and the concentration of Cu2+ in the solution is 0.1 M.

asked Jan 22 in ElectroChemistry by MelbaTulloch (2.2k points)

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1 answer 36 views

Assuming a chemical equilibrium reaction aA + bB ⇌ cC + dD, with initial concentrations of [A] = 0.2 M, [B] = 0.3 M, [C] = 0 M, and [D] = 0 M at 25°C, what will be the new equilibrium concentration of [B] if the volume of the container is decreased to half the original volume?

asked Jan 22 in Chemical equilibrium by ElkeMary0923 (1.7k points)

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Assuming a carbon-carbon double bond length of 1.33 Å and a carbon-hydrogen single bond length of 1.09 Å, what is the approximate bond length of a carbon-carbon triple bond in a molecule with a linear geometry?

asked Jan 22 in Physical Chemistry by AntwanBowie (2.0k points)

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1 answer 63 views

Assume a reaction where magnesium (Mg) reacts with chlorine (Cl2) to produce magnesium chloride (MgCl2). If we start with 10 grams of magnesium and 20 grams of chlorine, what mass of magnesium chloride can we produce?

asked Jan 22 in Chemical reactions by UweEales0685 (1.8k points)

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Assume a reaction has reached equilibrium in a 1-liter container. If the volume is now reduced to 0.5 liters, what is the effect on the equilibrium position of the reaction?

asked Jan 22 in Chemical equilibrium by MacLgq130601 (2.4k points)

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As a chemistry student, how can you determine the effect of temperature on the conductivity of 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid?

asked Jan 22 in Physical Chemistry by Marilynn3793 (2.1k points)

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As a Chemistry student, analyze the environmental impact of an industrial project that involves the production of fertilizers, and suggest ways to mitigate its negative impact on the environment.

asked Jan 22 in Environmental Chemistry by ChristelIdr7 (1.7k points)

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1 answer 47 views

Analyzing the presence and concentration of heavy metals in landfill leachate and determining their impact on groundwater quality: A case study in a selected landfill site.

asked Jan 22 in Environmental Chemistry by EvieMerideth (2.3k points)

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Analyzing the levels of pesticide residues in commonly consumed fruits and vegetables and their potential health effects on humans: A case study in a specific region.

asked Jan 22 in Environmental Chemistry by MagdaMeares (1.8k points)

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Analyzing the effects of molecular weight and temperature on the flow behavior and viscosity of polymer melts using rheological measurements: a comparative study between polyethylene and polypropylene melts.

asked Jan 22 in Polymer Chemistry by RosieBloom03 (1.8k points)

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An unknown compound was discovered in a crime investigation. Use mass spectrometry to identify the molecular formula and possible functional groups present in the compound.

asked Jan 22 in Analytical Chemistry by VickeyBatema (1.9k points)

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An unknown compound was analyzed using mass spectrometry, and the resulting spectrum showed a molecular ion peak at m/z 214. Fragmentation patterns were also observed with peaks at m/z 121 and m/z 93. Can you identify the unknown compound and explain the fragmentation pathways leading to the observed peaks?

asked Jan 22 in Analytical Chemistry by VenusU65079 (1.8k points)

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An unknown compound is synthesized in the lab and needs to be identified using mass spectrometry. Design a step-by-step plan to analyze the compound, including sample preparation, instrument settings, interpretation of data, and identification of possible functional groups.

asked Jan 22 in Analytical Chemistry by BrodieUus47 (1.7k points)

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An unknown compound is suspected to be a crystal structure of sodium chloride. Using X-ray crystallography techniques, determine if the compound is indeed a sodium chloride crystal structure and calculate the lattice parameters of the crystal.

asked Jan 22 in Physical Chemistry by ErmelindaSey (1.8k points)

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An organic compound was synthesized in the laboratory. The compound is known to contain three functional groups - an alcohol, an alkene, and an ester. Using IR spectroscopy, a broad peak was observed in the region between 3200-3400 cm^-1, which indicates the presence of the alcohol group. However, two different peaks were observed in the region between 1640-1680 cm^-1, which could correspond to either the alkene or ester group. Using other spectroscopic techniques such as NMR and mass spectrometry, determine the structure of the compound and identify which peak corresponds to the alkene or ester functional group.

asked Jan 22 in Organic Chemistry by DonnellBeckh (2.3k points)

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An industrial process involves the reaction of nitrogen gas and hydrogen gas to produce ammonia gas, in the presence of a catalyst. If the equilibrium constant for this reaction at a certain temperature is 6.2 × 10^-2 and the initial concentrations of nitrogen and hydrogen gases are 1.2 M and 0.8 M respectively, what would be the equilibrium concentrations of the reactants and products if the catalyst increases the rate of the forward reaction by a factor of 4?

asked Jan 22 in Chemical equilibrium by BlancaVennin (1.5k points)

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