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A sample of 1.435 g of naphthalene, a compound commonly used in mothballs, is completely burned in a constant-volume bomb calorimeter. During the combustion, the temperature of the calorimeter and the surrounding water increases from 20.28°C to 25.95°C. The combined heat capacity of the bomb calorimeter and water is 10.17 kJ °C⁻¹.Calculate the molar heat of combustion of naphthalene.
What is the wavelength (in nanometers) of the photon emitted when an electron in a hydrogen atom transitions from the ni=5 energy level to the nf=2 energy level?
Calculate the change in internal energy for the combustion of 2 moles of carbon monoxide.
A gas is compressed inside a cylinder, and 462 J of work is done on the gas. During the same process, the gas releases 128 J of heat to the surroundings.Using the first law of thermodynamics, calculate the change in the internal energy of the gas.
A certain gas expands in volume from 2.0 L to 6.0 L at constant temperature. Calculate the work done by the gas if it expands
A Bunsen burner flame takes 8 minutes to raise 250 g of water from 20.0°C to 100.0°C when the water is contained in a beaker of mass 100.0 g having a specific heat capacity of 0.670 J g⁻¹ °C⁻¹
The osmotic pressure of a solution containing 1.26 g of a protein dissolved in 200 mL of aqueous solution is 2.57×10−3 bar at 27°C. Determine the molar mass of the protein.
In a mixture of solution, 50 mL of 16.9%(w/v) AgNO3 solution and 50mL of 5.8%(w/v)NaCl solutions are mixed. Calculate the mass of the precipitate formed after mixing.
At what temperature does water boil at 101.325 kpa if 117g of NaCl is added to 222g of water in a saucepan?
Determine whether the entropy change is positive or negative for each of the following reactions, and explain the reasoning behind your predictions.