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What is the formal charge on the nitrogen atom (N) in the ammonium ion (NH4+)? Show your calculation steps.

asked Mar 1 in Inorganic Chemistry by TheScientist (138k points)

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What are the factors that affect the phosphorescent properties of materials used in organic light-emitting devices (OLEDs)?

asked Mar 1 in PhotoChemistry by TheScientist (138k points)

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How can we design a chemical reactor that maximizes the yield of product X in a specific reaction, given the reaction kinetics, feed flow rate, and reactor volume constraints?

asked Mar 1 in Chemical engineering by TheScientist (138k points)

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What will be the effect on the equilibrium position of the redox reaction between Fe2+ and MnO4- if the concentration of Fe2+ is tripled, keeping the concentration of MnO4- constant?

asked Mar 1 in Chemical equilibrium by TheScientist (138k points)

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What is the amount of heat energy required to melt 15 grams of ice at 0°C? The enthalpy of fusion of water is 6.01 kJ/mol.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the percent yield of 4-bromoacetanilide if 5.0 grams of acetanilide is reacted with excess bromine, and the actual yield of 4-bromoacetanilide obtained in the experiment is 4.2 grams?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What are the factors that affect the degree of color change in a photochromic material, and how can these factors be controlled and optimized for practical applications such as eyeglasses or windows?

asked Mar 1 in PhotoChemistry by TheScientist (138k points)

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What is the standard enthalpy change for the vaporization of 50g of water at 100°C, given that the molar enthalpy of vaporization of water is 40.7 kJ/mol?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the formal charge of the oxygen atom in the sulfate ion (SO4^(2-))? Show your calculation and explain the meaning of the formal charge in this context.

asked Mar 1 in Inorganic Chemistry by TheScientist (138k points)

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What is the enthalpy change of dissolving 5 grams of sodium hydroxide (NaOH) in 100 mL of water at 25°C? Given the molar enthalpy of dissolution for NaOH is -44.5 kJ/mol.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the percent yield of a chemical reaction if you start with 50 grams of reactant A, but only produce 35 grams of product B, when the balanced equation indicates that you should produce 40 grams of product B?

asked Mar 1 in Chemical reactions by TheScientist (138k points)

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What is the change in internal energy of a system when two moles of hydrogen gas react with one mole of oxygen gas to form two moles of water vapor at constant temperature and pressure?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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What is the enthalpy change, in kilojoules per mole, when 6.0 grams of potassium chloride (KCl) is dissolved in 200.0 mL of water at 25°C? The molar heat of dissolution of KCl is -57.3 kJ/mol.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the theoretical yield of benzocaine that can be obtained from the reaction between 5 grams of p-aminobenzoic acid and 25 ml of ethanol, assuming a complete reaction and 100% yield?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the change in enthalpy when 2 moles of iron(III) oxide are reduced to iron metal in the presence of hydrogen gas? (Given: ΔH°f[Fe2O3] = -824.2 kJ/mol, ΔH°f[Fe] = 0 kJ/mol)

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the value of the reaction quotient Q for the following chemical reaction at a temperature of 25°C, given the concentrations of reactants and products: 2H2(g) + O2(g) → 2H2O(g) [H2] = 0.25 M [O2] = 0.15 M [H2O] = 0.20 M

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the heat of hydration when 50 grams of anhydrous calcium chloride (CaCl2) is mixed with 100 mL of water (H2O)? The molar heat of hydration for calcium chloride is -81 kJ/mol.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the formal charge of the chlorine atom in the compound ClO3^-? Show your calculation and explain whether the chlorine atom has a positive or negative formal charge in this compound.

asked Mar 1 in Inorganic Chemistry by TheScientist (138k points)

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1 answer 84 views

What is the reaction quotient for the equilibrium system at 298K if the concentrations of reactants and products are [NO]= 0.85 M, [O2]= 0.12 M, and [NO2]= 0.17 M, respectively for the reaction: 2 NO (g) + O2 (g) ⇌ 2 NO2 (g)?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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1 answer 81 views

How can we control and optimize the fluorescence properties of quantum dots through photochemical processes?

asked Mar 1 in PhotoChemistry by TheScientist (138k points)

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