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What is the enthalpy change for the combustion of 1 mole of methane (CH4) at constant pressure if the standard enthalpy of formation of methane is -74.8 kJ/mol? Write a balanced equation for the combustion reaction and show your calculations.

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

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What is the formal charge on the nitrogen atom in the compound NO₃⁻? Show your work and explain your reasoning.

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

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What are the different polymer characterization techniques used to determine the molecular weight distribution of polymers, and how do these techniques differ in their accuracy and precision?

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

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What is the amount of heat released when 2.5 grams of ethanol (C2H5OH) burns completely in excess oxygen, given that the heat of combustion of ethanol is -1371 kJ/mol and the molar mass of ethanol is 46.07 g/mol?

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

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How much heat is released when 20 grams of methane (CH4) undergoes complete combustion?

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

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What is the enthalpy of polymerization of polystyrene if 25 grams of styrene monomer undergo polymerization at constant pressure and release 100 kJ of heat energy?

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

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What is the heat released during the combustion of 5 grams of propane (C3H8) at constant volume, given that the enthalpy change of combustion of propane is -2220 kJ/mol?

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

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What are the different types of chemical reactions and how can they be identified and balanced using chemical equations?

asked Mar 1 in Chemical education 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 standard enthalpy change when 50.0 mL of 0.200 M HCl is mixed with 50.0 mL of 0.200 M NaOH to form NaCl(aq) and H2O(l) at 25°C? Given: The specific heat capacity of the solution is 4.18 J/(g°C) and the density of the solution is 1.00 g/mL.

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

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What is the corrosion current density of a copper metal in a galvanic couple with a silver metal in a 0.1 M solution of NaCl at 25°C, given that the open circuit potential is 0.34 V and the Tafel slope is 120 mV/decade for the copper electrode?

asked Mar 1 in ElectroChemistry 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 are the three types of chemical reactions, and can you give an example of each?

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

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What is the effect of adding a buffer to a solution containing acetic acid and sodium acetate on the equilibrium position of the acid-base reaction between acetic acid and acetate ions? Provide numerical calculations to support your answer.

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

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What is the formal charge of the nitrogen atom in the molecule HCN?

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

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What is the change in entropy (ΔS) when 1 mole of hydrogen gas (H2) reacts with 1 mole of chlorine gas (Cl2) to form 2 moles of hydrogen chloride gas (2HCl) at a temperature of 298 K and a pressure of 1 atm?

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

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What is the activation energy of the following chemical reaction: 2H2O2(aq) → 2H2O(l) + O2(g)? Use the experimental data provided to calculate the activation energy in Joules per mole.

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

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What conditions should be optimized in the process of producing biofuels from algae, to achieve maximum yield and quality of biofuels?

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

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What is the heat of hydration for the reaction between 50 grams of anhydrous copper(II) sulfate and excess water, given that the final solution mass is 250 grams and the temperature change observed during the reaction is -30 °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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