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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 amount of energy required to melt 50 grams of ice at 0°C, given that the heat of fusion of ice is 333.55 J/g?

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

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What is the specific heat capacity (in J/g°C) of copper if 100 grams of the metal absorbs 1500 J of heat and its temperature increases by 20°C?

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

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What is the formal charge of the nitrogen (N) atom in the molecule of ammonia (NH₃)? Show your calculations.

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

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What is the enthalpy change of the dissolution of 5.00 g of sodium chloride in 100.0 mL of water at 25°C, given that the final temperature of the solution is 28.6°C and the heat capacity of the solution is 4.18 J/g°C?

asked Mar 1 in ThermoChemistry 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 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 enthalpy change of precipitation when 50 mL of 0.1 M BaCl2 is mixed with 25 mL of 0.2 M Na2SO4, given that ΔH˚f of BaSO4 is -1464 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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What is the formal charge of each atom in the CH3COOH molecule? Show your calculation and explain the significance of the formal charges in this molecule.

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

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How to use quantum chemistry methods to accurately predict the electronic and magnetic properties of a selected transition metal complex, considering factors such as ligand field effects, coordination number, oxidation state, and spin state?

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

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What is the theoretical yield of 2,4-dichloronitrobenzene that can be obtained from reacting 10 grams of nitrobenzene with excess chlorine gas?

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

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What is the diffusion coefficient of a gas (in cm²/s) at 25°C and 1 atm pressure if its root-mean-square velocity is 400 m/s and the gas constant R is 8.314 J/mol·K? The gas has a molar mass of 32 g/mol and a collision diameter of 3.5 Å.

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

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What is the heat capacity of 20 grams of water if it is heated from 25°C to 50°C?

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

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What is the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(l) Given that the standard enthalpy of formation for H2O(l) is -285.8 kJ/mol, and the standard enthalpy of formation for H2(g) and O2(g) are 0 kJ/mol.

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

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What is the balanced redox reaction between potassium permanganate and oxalic acid in acidic medium?

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

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How can we accurately calculate the band gap energy and optical properties of a semiconductor quantum dot with a radius of 5 nm using density functional theory (DFT)?

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

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What is the equilibrium constant (Kc) for the reaction between potassium permanganate (KMnO4) and sulfur dioxide (SO2) in aqueous solution, given that sulfur dioxide is a weak reducing agent? Calculate the value of Kc at a temperature of 298 K.

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

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What are the significant factors that affect carbon footprint, and how can you reduce it to minimize its impact on the environment?

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

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What is the surface area of a sample of activated charcoal determined by gas adsorption using the BET method? Calculate the surface area of the activated charcoal sample given its mass, pore volume, and the adsorption isotherm data.

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

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