Hot questions

0 votes

1 answer 77 views

What is the enthalpy change for the combustion of propane?

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

0 votes

1 answer 70 views

What is the yield of 2,4,6-trinitrotoluene that can be obtained if 500 mL of toluene is mixed with 700 mL of nitric acid (concentration 65%) and the reaction is carried out for 2 hours at a temperature of 60°C?

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

0 votes

1 answer 73 views

What is the pH level of a 0.1 M solution of hydrochloric acid (HCl) measured using a pH meter?

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

0 votes

1 answer 77 views

What is the enthalpy change for the combustion of one mole of methane (CH4) gas to form carbon dioxide (CO2) gas and water (H2O) vapor at standard temperature and pressure (STP)?

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

0 votes

1 answer 82 views

What are the main reasons for the difficulty in integrating technology into chemistry education, and what strategies can chemistry educators use to overcome these obstacles and effectively incorporate technology into their teaching methodologies?

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

0 votes

1 answer 70 views

What is the wavenumber (cm^-1) of the fundamental vibrational mode of carbon dioxide using Fourier transform infrared spectroscopy?

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

0 votes

1 answer 72 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 73 views

What is the pH of a 0.1 M solution of acetic acid?

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

0 votes

1 answer 74 views

What is the heat required to raise the temperature of 50 grams of water from 20°C to 50°C, given that the heat capacity of water is 4.184 J/g°C?

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

0 votes

1 answer 71 views

What is the standard enthalpy change when 5 grams of sodium chloride (NaCl) dissolves in 100 mL of water at a temperature of 25°C?

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

0 votes

1 answer 75 views

What is the formal charge on the nitrogen atom in the ammonium ion (NH4+)? Show the calculation and explain whether the ion is a positive or negative ion based on the formal charge.

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

0 votes

1 answer 79 views

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)

0 votes

1 answer 73 views

What is the percentage yield of a chemical reaction if 12 grams of product are obtained when 20 grams of reactant are used and the theoretical yield is 15 grams?

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

0 votes

1 answer 75 views

What is the formal charge on the central atom (in brackets) in SO3²⁻? Calculate the formal charge on sulfur (S) and explain whether the molecule is overall neutral or has a charge.

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

0 votes

1 answer 79 views

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)

0 votes

1 answer 73 views

What is the percent yield of magnesium oxide when 10.0 grams of magnesium is reacted with excess oxygen and 12.5 grams of magnesium oxide is produced? The theoretical yield of the reaction is 16.2 grams.

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

0 votes

1 answer 71 views

What is the standard enthalpy change for the vaporization of 50 grams of water at 100°C and 1 atm pressure? Given the molar enthalpy of vaporization of water is 40.7 kJ/mol.

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

0 votes

1 answer 86 views

What are the vibrational frequencies of a CO molecule and a CO2 molecule, and how can those frequencies be identified experimentally using vibrational spectroscopy techniques?

asked Feb 28 in Physical Chemistry by TheScientist (138k points)

0 votes

1 answer 73 views

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)

0 votes

1 answer 72 views

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)

Categories