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A chemistry student needs to determine the percent composition of nitrogen (N) in a sample of an unknown organic compound. Using elemental analysis, the student determines the mass of the sample to be 0.254 g and the mass of the products after combustion to be 0.727 g of CO2 and 0.298 g of H2O. What is the percent composition of nitrogen in the sample?

asked Jan 22 in Analytical Chemistry by DanielleSauc (2.4k points)

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1 answer 74 views

A chemistry student needs to determine the percent by mass of magnesium (Mg) in a sample of limestone. The student has access to 5 grams of the sample and is provided with the following information: the sample is comprised of calcium carbonate (CaCO3) and magnesium carbonate (MgCO3); the atomic masses of the elements are: Ca = 40.08 g/mol, C = 12.01 g/mol, O = 16.00 g/mol, and Mg = 24.31 g/mol; and the sample contains a total of 3.06 grams of carbon (C). Calculate the percentage by mass of magnesium in the limestone sample using mass balance calculations.

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

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1 answer 58 views

A chemistry student needs to determine the oxidation state changes of the atoms and identify the oxidizing and reducing agents in the following reaction: C2H5OH + 2 MnO4- → 2 CH3COOH + 2 MnO2 + 4 OH-

asked Jan 22 in Organic Chemistry by NamSampson2 (1.8k points)

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1 answer 64 views

A chemistry student needs to determine the new equilibrium concentration of a complex ion, if the temperature is increased by 10°C from the initial temperature of 25°C, and the equilibrium constant for the reaction is 0.056. The initial concentration of the reactants are: [Fe3+] = 0.025 M, [SCN-] = 0.015 M, and [FeSCN2+] = 0.007 M.

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

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1 answer 47 views

A chemistry student needs to determine the molar mass of aluminum chloride (AlCl3). What is the molar mass of aluminum chloride?

asked Jan 22 in Inorganic Chemistry by EleanoreOliv (1.9k points)

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1 answer 101 views

A chemistry student needs to determine the major product(s) formed from the reaction between 1-bromo-3-methylcyclohexane and sodium ethoxide in ethanol solvent with a heat source. What are the major products formed and explain the mechanism of the reaction?

asked Jan 22 in Organic Chemistry by MargueriteSl (1.9k points)

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1 answer 71 views

A chemistry student needs to determine the Langmuir constant and maximum adsorption capacity of a metal oxide nanoparticle using the Langmuir adsorption isotherm equation from experimental data obtained at different concentrations of a given adsorbate in the water. Determine the Langmuir equation parameters and plot the experimental data and the Langmuir model using a graph. Finally, interpret the results in terms of the adsorption behavior of metal oxide nanoparticle towards the selected adsorbate.

asked Jan 22 in Surface Chemistry by JaneW5862561 (1.8k points)

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1 answer 82 views

A chemistry student needs to determine the equilibrium constant (Kc) for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)At a certain temperature, 0.2 mole of nitrogen gas (N2), 0.3 mole of hydrogen gas (H2), and 0.4 mole of ammonia gas (NH3) were placed in a 1 L container. Using these initial concentrations, what is the equilibrium constant (Kc) for the reaction?

asked Jan 22 in Chemical equilibrium by KristalDmb02 (1.6k points)

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1 answer 72 views

A chemistry student needs to determine the equilibrium concentrations of reactants and products for the following reaction:2 NOCl (g) ⇌ 2 NO (g) + Cl2 (g)The initial concentration of NOCl is 0.50 M and the equilibrium constant, Kc = 4.68 x 10^-3. What are the equilibrium concentrations of NO and Cl2?

asked Jan 22 in Chemical equilibrium by ChiKellett4 (1.5k points)

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1 answer 82 views

A chemistry student needs to determine the enthalpy of oxidation of magnesium. For this, they need to conduct an experiment in which they react 1 gram of magnesium metal with excess hydrochloric acid of 2 moles concentration. They need to measure the temperature change that occurs during the reaction, which they will use to calculate the enthalpy of oxidation of magnesium. What is the enthalpy of oxidation of magnesium according to the student's experiment?

asked Jan 22 in ThermoChemistry by WhitneyCarey (1.8k points)

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1 answer 87 views

A chemistry student needs to determine the enthalpy of desorption for a specific substance. The substance was adsorbed onto activated carbon in a packed bed reactor at 25°C and under a pressure of 4 bar. The adsorption process was carried out until saturation was reached. The packed bed reactor was then heated to 100°C until complete desorption. The pressure was maintained at 4 bar during the entire process. Given the initial mass of the adsorbate and the final mass of the activated carbon, calculate the enthalpy of desorption for the substance.

asked Jan 22 in ThermoChemistry by JannaWales93 (2.0k points)

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1 answer 86 views

A chemistry student needs to determine the enthalpy change for the reaction of nitrogen gas reacting with hydrogen gas to form ammonia gas, given that they have the following information:N2(g) + 3H2(g) --> 2NH3(g) ΔH1 = -92.4 kJ/mol2H2(g) + O2(g) --> 2H2O(l) ΔH2 = -572.0 kJ/molN2(g) + O2(g) --> 2NO(g) ΔH3 = +180.6 kJ/molUse Hess's law to calculate the enthalpy change for the reaction:2NH3(g) + 5O2(g) --> 2HNO3(aq) + 2H2O(l)

asked Jan 22 in Chemical reactions by YvetteLink0 (2.0k points)

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1 answer 68 views

A chemistry student needs to determine the effect on the equilibrium position of a chemical reaction when the concentration of a reactant is decreased. The student is given the balanced equation: N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + heatIf the concentration of H₂ is decreased by removing 50% of its concentration, what would be the effect on the concentration of N₂, NH₃, and the position of equilibrium?

asked Jan 22 in Chemical reactions by MerryR11813 (1.7k points)

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1 answer 97 views

A chemistry student needs to determine the effect of increasing the temperature on the equilibrium constant of the formation of a complex ion. Given the equation: Fe3+ + 4OH- ↔ Fe(OH)4- Kc = 2.1 x 10^-18 If the initial concentration of Fe3+ is 0.02 M and OH- is 0.1 M at 25°C, what is the new equilibrium constant at 35°C assuming the reaction is exothermic and the heat of reaction is -20 kJ/mol?

asked Jan 22 in Chemical equilibrium by TimmyCapra21 (2.1k points)

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1 answer 79 views

A chemistry student needs to determine the effect of increasing the pressure on the equilibrium position of a reaction. Consider the following reaction at equilibrium: N2(g) + 3H2(g) ⇌ 2NH3(g) If the pressure is increased, will the reaction shift to the left or right, and in what direction will the reaction quotient, Q, shift as a result? Justify your answer using Le Chatelier's principle.

asked Jan 22 in Chemical equilibrium by Hugo83583981 (1.5k points)

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1 answer 83 views

A chemistry student needs to determine the effect of increasing temperature on the equilibrium position of a chemical reaction in which an exothermic reaction is taking place. Given the balanced chemical equation A + B ⇌ C + heat, the student needs to determine how the concentration of products and reactants will change as the temperature is increased, and explain the observed changes using Le Chatelier's principle.

asked Jan 22 in Chemical reactions by MackMurry86 (2.2k points)

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1 answer 68 views

A chemistry student needs to determine the effect of decreasing the temperature on the equilibrium position of the reaction N2(g) + 3H2(g) <-> 2NH3(g) if the initial concentrations of N2, H2 and NH3 are 0.4 M, 0.6 M, and 0.8 M respectively. How does the equilibrium concentration of NH3 change if the temperature is decreased from 400 K to 300 K, assuming constant volume and pressure?

asked Jan 22 in Chemical equilibrium by AzucenaGrasb (1.6k points)

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1 answer 83 views

A chemistry student needs to determine the effect of an increase in temperature on the equilibrium concentration of products and reactants for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g). Calculate the new concentration of NH3 at equilibrium when the temperature is raised from 300 K to 400 K.

asked Jan 22 in Chemical equilibrium by FilomenaWago (1.8k points)

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1 answer 54 views

A chemistry student needs to determine the effect of adding NaCl to a solution containing AgNO3 at equilibrium. The original solution had concentration [Ag+]=0.01M and [NO3-]=0.01M, and Ksp=1.8x10^-10. How much NaCl (in grams) is needed to be added to the solution in order to decrease the [Ag+] concentration by a factor of 10?

asked Jan 22 in Chemical equilibrium by DieterSchrod (1.9k points)

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1 answer 81 views

A chemistry student needs to determine the effect of adding more reactant or product on the equilibrium position of the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)If the student adds more N2 or NH3 to the reaction mixture, how will the equilibrium position change? and how will the equilibrium constant (Kc) for the reaction be affected?

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

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