Recent questions in Chemistry

0 votes

1 answer 32 views

What is the standard enthalpy change for the fusion reaction of 2.5 grams of ice at 0 degrees Celsius?

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

0 votes

1 answer 26 views

What is the standard enthalpy change for the fusion reaction between aluminum and oxygen to form aluminum oxide if 10 grams of aluminum reacts completely with excess oxygen under standard conditions?

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

0 votes

1 answer 31 views

What is the standard enthalpy change for the fusion of solid sodium chloride at 25°C and 1 atm, given the following reaction: NaCl(s) → Na(l) + Cl2(g)?

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

0 votes

1 answer 37 views

What is the standard enthalpy change for the fusion of 50 grams of ice at 0°C to liquid water at 25°C, assuming constant pressure and no heat loss to the surroundings?

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

0 votes

1 answer 42 views

What is the standard enthalpy change for the fusion of 100 grams of ice at 0°C to liquid water at 0°C? Assume that the specific heat capacity of ice and water are 2.09 and 4.18 J/g·°C, respectively, and the enthalpy of fusion of ice is 6.01 kJ/mol.

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

0 votes

1 answer 29 views

What is the standard enthalpy change for the fusion of 10 grams of solid sodium (Na) at its melting point, given that the molar heat of fusion of sodium is 2.60 kJ/mol?

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

0 votes

1 answer 38 views

What is the standard enthalpy change for the fusion of 10 grams of ice at 0°C to liquid water at 25°C? Given the standard enthalpy of fusion for ice is 6.01 kJ/mol and the specific heat capacity of water is 4.18 J/g°C.

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

0 votes

1 answer 36 views

What is the standard enthalpy change for the dissolution of 5.00g of sodium chloride (NaCl) in 100mL of water (H2O) at 25°C? The molar mass of NaCl is 58.44 g/mol and the density of water at this temperature is 0.997 g/mL.

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

0 votes

1 answer 42 views

The problem is:What is the standard enthalpy change for the dissolution of 5.00 grams of solid magnesium chloride (MgCl2) in 250.0 mL of water at 25 ℃? Given the molar enthalpy of hydration of MgCl2 is -641 kJ/mol.

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

0 votes

1 answer 36 views

What is the standard enthalpy change for the dissolution of 5.00 g of potassium chloride (KCl) in water, given that the molar heat of solution for KCl is -17.95 kJ/mol?

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

0 votes

1 answer 29 views

What is the standard enthalpy change for the dissolution of 2.5 moles of sodium chloride in water at 25°C, given that the standard enthalpy of formation of NaCl is -411.1 kJ/mol, and the molar heat capacity of the solution is 4.18 J/g K?

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

0 votes

1 answer 28 views

What is the standard enthalpy change for the combustion of 3 moles of propane gas (C3H8) at standard conditions? Express your answer in kJ/mol of propane burned.

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

0 votes

1 answer 29 views

What is the standard enthalpy change for the combustion of methane (CH4) to produce carbon dioxide (CO2) and water (H2O) if the reactants and products are at standard conditions (298 K and 1 atm)?

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

0 votes

1 answer 43 views

Sure, here's a problem:Calculate the standard enthalpy change for the combustion of methane gas (CH4) using the following information:Formation of CO2: -393.5 kJ/molFormation of H2O: -285.8 kJ/molFormation of CH4: -74.8 kJ/mol

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

0 votes

1 answer 45 views

What is the standard enthalpy change (ΔH°) for the reaction of 1 mole of liquid ethanol (C2H5OH) and 1 mole of liquid oxygen (O2) to produce 2 moles of gaseous carbon dioxide (CO2) and 3 moles of liquid water (H2O)?

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

0 votes

1 answer 36 views

What is the standard enthalpy change for the reaction of methane gas and oxygen gas to form carbon dioxide gas and water vapor, given that all gases are at standard temperature and pressure conditions?

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

0 votes

1 answer 36 views

What is the standard electrode potential for the reduction of Cu2+ to Cu at a temperature of 25°C? Use the half-reaction equation and the Nernst equation to calculate the potential.

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

0 votes

1 answer 42 views

What is the standard cell potential for a galvanic cell made up of a silver electrode and a zinc electrode, where the concentration of silver ions is 0.01 M and the concentration of zinc ions is 1.0 M?

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

0 votes

1 answer 36 views

What is the specific surface area of a porous material if 10 mL of nitrogen gas is adsorbed at 77 K and 1 atm and the resulting monolayer thickness is 2.5 nm? The cross-sectional area of a nitrogen molecule is 0.16 nm^2.

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

0 votes

1 answer 38 views

What is the specific surface area (in m²/g) of a sample of activated carbon that adsorbs 20 ml of nitrogen gas at STP, assuming monolayer formation and a nitrogen cross-sectional area of 0.162 nm²? The mass of the activated carbon sample is 0.5 g.

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

Categories